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Comcast Cheating On Bandwidth Testing?

dynamo52 writes "I'm a freelance network admin serving mainly small business clients. Over the last few months, I have noticed that any time I run any type of bandwidth testing for clients with Comcast accounts, the results have been amazingly fast — with some connections, Speakeasy will report up to 15 Mbps down and 4 Mbps up. Of course, clients get nowhere near this performance in everyday usage. (This can be quite annoying when trying to determine whether a client needs to switch over to a T1 or if their current ISP will suffice.) Upon further investigation, it appears that Comcast is delivering this bandwidth only for a few seconds after any new request and it is immediately throttled down. Doing a download and upload test using a significantly large file (100+ MB) yields results more in line with everyday usage experience, usually about 1.2 Mbps down and about 250 Kbps up (but it varies). Is there any valid reason why Comcast would front-load transfers in this way, or is it merely an effort to prevent end-users from being able to assess their bandwidth accurately? Does anybody know of other ISPs using similar practices?"

287 comments

  1. This is an advertised feature I believe by vacaboca · · Score: 5, Informative

    Doesn't Comcast advertise this "SpeedBoost" as a feature - the language in their ads is something like "get massive super speed for the first 10MB of a download, then it will revert to your provisioned line speed"... So, it actually *is* a good thing rather than something to pad bandwidth tests, and it does generally help your general user, right?

    1. Re:This is an advertised feature I believe by andawyr · · Score: 5, Informative

      I agree - I know that Shaw Cable (Alberta) offers a plan that does exactly this: for 5-20 seconds, you get increased download bandwidth. This is their PowerBoost feature, that costs an extra $2.95 above your regular plan....

    2. Re:This is an advertised feature I believe by jandrese · · Score: 4, Insightful

      Yeah, the point is that you can get a webpage down in those first few seconds generally so browsing is much better than it would otherwise be.

      --

      I read the internet for the articles.
    3. Re:This is an advertised feature I believe by Ed+Avis · · Score: 5, Interesting

      So... how can you tweak your Bittorrent client to fool Comcast into thinking it is making lots of small downloads?

      --
      -- Ed Avis ed@membled.com
    4. Re:This is an advertised feature I believe by arivanov · · Score: 5, Insightful

      Torrents do that anyway. That is the reason why comcast have to beat them on the head. Each segment in the download is small enough to fit its "booster" criteria.

      Actually, there is nothing wrong with this approach. This means that interactive services and casual browsing are favoured vs bulk downloads. That is what every ISP wants to do anyway.

      --
      Baker's Law: Misery no longer loves company. Nowadays it insists on it
      http://www.sigsegv.cx/
    5. Re:This is an advertised feature I believe by LordKazan · · Score: 1

      i don't know if you'd have to... because the typical largest block in a torrent is 4meg.. so if you have to init a new connection to the peer for transfer it may work already.

      but it's probably only giving you that boost when you start from idle. so write an azureus plugin that batches your transfer starts appropriately.

      --
      If you cannot keep politics out of your moderation remove yourself from the Mod Lottery.. NOW!
    6. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 2, Insightful

      Doesn't matter if you do.

      1) No peer can upload at those speeds
      2) If your speeds were that high, Comcast would just cut your connection due to their 'fair use' policy (trust me I know)

    7. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      Better yet, turn sideways and run in place, watching the download progress bar as you do. You get the appearance you're moving faster than light!

    8. Re:This is an advertised feature I believe by icsx · · Score: 1

      How it is good thing? If user pays from "insert speed here" he should get that speed full time and not just for first few seconds or 10MB. Client should get what he or she pays for. On the other hand, there is propably that fine print somewhere, like "max speed is 24/1 Mbit/s but works atleast with 1024/256Kbit/s".

    9. Re:This is an advertised feature I believe by 192939495969798999 · · Score: 1

      If this were true, couldn't you break up downloads into 10 mb chunks and get the equivalent of the high "sustained" speed numbers?

      --
      stuff |
    10. Re:This is an advertised feature I believe by sm62704 · · Score: 3, Funny

      There is an old saying "never attribute to malice what incompetence can explain", but come on guys, this is comcast. A snake doesn't bite by mistake.

      --
      mcgrew's razor: Never attribute to stupidity that which can be explained by greedy self-interest
    11. Re:This is an advertised feature I believe by xSauronx · · Score: 4, Interesting

      This is it, and it should be amazingly obvious to any "sysadmin" who should know something about general browsing habits. I worked for a wISP for a year and this was a standard feature offered by the company for no extra charge. Max subscriber speeds were 1.5 Mbps, but for about 20 seconds ALL traffic was burst to 2 Mbps, regardless of the subscriber paying for the 500 k/s speed or something higher. For general browsing and light email, it made all the customers quite happy to have things terrifically speedy.

      --
      By and large, language is a tool for concealing the truth. -- George Carlin
    12. Re:This is an advertised feature I believe by strredwolf · · Score: 1

      They had been for a while, especially with those "High speed" commercials. Not as of late, though.

      --

      --
      # Canmephians for a better Linux Kernel
      $Stalag99{"URL"}="http://stalag99.net";
    13. Re:This is an advertised feature I believe by somersault · · Score: 4, Informative

      If you read the whole of the comment (don't strain yourself, now), you'd see that the user is in fact paying for "insert speed here", but for a premium they can also get "insert speed here" for the first $size_limit || $time_limit of their download, which *is* a good thing when browsing webpages or other small files.

      --
      which is totally what she said
    14. Re:This is an advertised feature I believe by ElizabethGreene · · Score: 5, Informative

      You are correct in your interpretation. The customer briefly receives more than they pay for after a period of inactivity, this throttles down to the 'purchased' bandwidth as the activity increases. For Read-Click-Load-Read web browsing this gets content in front of eyeballs quicker and is a "good" thing. If you are using a tiny file for a bandwidth test it screws up the results. HINT: USE A BIGGER FILE.

      People are out with pitchforks and torches over the "bad" thing Comcast does, throttling Torrent downloads, which works completely differently. To throttle a torrent, they forge a "I'm dead" packet from remote host, and send it to the customer. This causes the customer's torrent application to shop elsewhere for a feed. The repeated connect-forge disconnect-search-connect process slows the overall transfer. This only works because of the multi-peer technology underlying torrents, and wouldn't work with web browsing or ftp*.

      -Ellie
      * technically it would reduce the bandwidth usage, because it terminates the connection. This would result in broken connections and half-downloaded files. Then the pitchforks would REALLY come out.

    15. Re:This is an advertised feature I believe by _KiTA_ · · Score: 1, Insightful

      Torrents do that anyway. That is the reason why comcast have to beat them on the head. Each segment in the download is small enough to fit its "booster" criteria.

      Actually, there is nothing wrong with this approach. This means that interactive services and casual browsing are favoured vs bulk downloads. That is what every ISP wants to do anyway. Yeah, this is exactly what you want as an ISP. Your real customers aren't the college assclowns on Napster / Animesuki / etc, they're the Grandmas wanting to load Genealogy.com fast, and the professors wanting their students to be able to load Wikipedia fast enough to do research. (As some overgeneralized examples.)

      Broadband, like dialup, is subsidized by the low use casual customers. Come to think of it, so's World of Warcraft, which I wish more of those "ubers" would realize before it's too late.
    16. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      I have optonline and I actually get sustained download rates around 20Mbit even on large iso images.

    17. Re:This is an advertised feature I believe by NickCatal · · Score: 3, Interesting

      There is a 'cooldown' timer. You need to be at very low bandwidth levels for a specific amount of time (or some other measure) before you can 'burst' again.

      In chicago it is 12mbps then down to 6 or 8 depending on your plan. To do a proper speedtest on comcast you need to download a 100-200MB file. Although if you are getting 12mbps easily odds are you are getting your rated line speed.

      --
      -nick
    18. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      Try downloading something from a server that has a good connection:

      http://download3.vmware.com/software/vmserver/VMware-server-installer-1.0.4-56528.exe

      Not every server has a huge pipe coming into it. Comcast can only provide so much

    19. Re:This is an advertised feature I believe by nbert · · Score: 1

      Broadband, like dialup, is subsidized by the low use casual customers.
      In other words the casual user is paying too much. Dialup was actually more fair in this regard, because the more you used it, the more you paid.

      A related note: Mail- and webservers usually don't serve content at more than 1 mbit, so all those speedboost features are not that useful at all. Just monitor your bandwith usage when you are retriving lots of mails...
    20. Re:This is an advertised feature I believe by mrxak · · Score: 1

      Ohhhh. So that's what it is. I keep seeing it on ads but I've never seen it actually explained. I assumed it was just marketing speak pretending to be some feature that didn't really exist.

    21. Re:This is an advertised feature I believe by operagost · · Score: 1

      You must have been a veeeeeery early adopter of broadband. Dialup ISPs offered unlimited access for $20-30/month in the mid 1990s.

      --

      Gamingmuseum.com: Give your 3D accelerator a rest.
    22. Re:This is an advertised feature I believe by alx5000 · · Score: 2, Informative

      OVH offers dedicated servers with a dedicated 5 Mbps line, but you can upload some MB (I can't really remember if it was 5 or 10 MB) using full 100 Mbps capacity. After that, you let your upload privilege "refill" (i.e. using less than 5 Mbps "recharges the line"), so you can get another burst.

      Nothing new under the sun. If anything, it's kind of a cool feature. If you need to measure real bandwidth, bursty downloads won't do.

      --
      My 0.02 cents
    23. Re:This is an advertised feature I believe by the_B0fh · · Score: 1

      Please use the correct term. What they are doing to torrent traffic is not throttling. Killing, stopping, fscking are all good words. Throttling is not. Throttling implies slowing down. RST packets do not slow down your traffic. There are actual throttling things you can do at the IP level. RST IS NOT ONE OF THEM

    24. Re:This is an advertised feature I believe by Crazy+Taco · · Score: 2, Interesting

      Doesn't Comcast advertise this "SpeedBoost" as a feature - the language in their ads is something like "get massive super speed for the first 10MB of a download, then it will revert to your provisioned line speed"... So, it actually *is* a good thing rather than something to pad bandwidth tests, and it does generally help your general user, right?

      Except that I never get more than my apportioned amount. In other words, my SpeedBoost never goes faster than the 6MB I actually pay for. I think that's what the person who wrote the article is saying too: "Goes at the speed they paid for, which is really fast, for a short time period and then drops to something like 1.2 MB, which is clearly slower than most comcast plans."

      --
      Beware of bugs in the above code; I have only proved it correct, not tried it.
    25. Re:This is an advertised feature I believe by nbert · · Score: 1

      No, I'm not an early adopter, I'm just in a different country where flatrates used to be rare. I should have considered this when posting

      .However, this is not the point I was trying to make. Back in the mid-90's there was a variety of plans available for all sorts of usage patterns. Today even the most casual user has a flatrate. Most users would be better off with a (cheaper) volume or time based contract but of course the ISPs don't want that.

    26. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      One can't.

    27. Re:This is an advertised feature I believe by jsdcnet · · Score: 2, Informative

      Except that I never get more than my apportioned amount. In other words, my SpeedBoost never goes faster than the 6MB I actually pay for. I think that's what the person who wrote the article is saying too: "Goes at the speed they paid for, which is really fast, for a short time period and then drops to something like 1.2 MB, which is clearly slower than most comcast plans." That person should call up and complain. We were paying for 8MB, it was not running that fast, they checked and realized our modem needed a configuration reload, after which we were back up to our paid speed with a credit on our account for the time missed. Also, not all older cable modems are compatible with the "SpeedBoost" technology, they may need to trade in for a newer model.
      --
      no longer working for cnet
    28. Re:This is an advertised feature I believe by mrbcs · · Score: 1

      It's called burst. Easily set up in Motorola wireless radios as well. Your burst speed can be considerably different than the transfer speed. Makes browsing the web very fast and will temporaily increase the download speeds. I haven't seen it affect speedtest.net though.

      --
      I'm not anti-social, I'm anti-idiot.
    29. Re:This is an advertised feature I believe by croddy · · Score: 4, Interesting

      I've made something of a game out of it, actually. With careful tactics, one can easily hit as much as 1.0 MiB/s upstream for short periods. I use Deluge to play. My present record is 2.4 MiB/s, on an Ubuntu 7.10 torrent for which I already had all the file data.

      First, configure your torrent client to use a modest number of connections -- limit it to, say, 250 connections globally and 70% of your nominal upstream speed. Then, get on a very large, active torrent and build up a few minutes' worth of downloaded data. Once you're in the swarm, open everything wide up -- no global connection limit, no bandwidth cap, and no per-torrent upload slot limit. If your client has a bandwidth chart, watch it scroll by and enjoy the thrill as your upstream bandwidth surges to heights like you have never seen before. Of course, eventually the Power Boost will wear off and some connections will finish as their pieces are completely transferred, but it's fun while it lasts.

    30. Re:This is an advertised feature I believe by Fallen+Kell · · Score: 4, Informative
      To throttle a torrent, they forge a "I'm dead" packet from remote host, and send it to the customer. This causes the customer's torrent application to shop elsewhere for a feed. The repeated connect-forge disconnect-search-connect process slows the overall transfer. This only works because of the multi-peer technology underlying torrents, and wouldn't work with web browsing or ftp*.

      Actually that is not entirely correct. If they were simply forging the RST packet and only sending it to their customer it would be a simply matter of having the customer's firewall filter out all RST packets on specified port that is used for torrent download/uploads. I in fact have such a filter rule in place. However, detailed testing has shown that Comcast is sending the RST packet to BOTH their customer AND the outside connection, not just their own customers. Unless both sides have the RST filter in place on their firewalls, the connections are still dropped and throttled. This is what is going to get them into trouble as they are not just sending forged packets to their customers whom they have it written down in their service agreements somewhere that they can do this to you, but they are also forging YOUR identity and sending those packets to outside entities to affect their service as well, something that those people have NOT agreed to have happen to them.

      --
      We were all warned a long time ago that MS products sucked, remember the Magic 8 Ball said, "Outlook not so good"
    31. Re:This is an advertised feature I believe by CharlieHedlin · · Score: 4, Interesting

      They aren't shaping based on individual downloads. They are going to shape all the traffic going to your cable modem as a single stream. There may be other outbound queues within the shaper to provide fair queuing and such, but that gets too complicated for this post.

      Most shapers (including the ones in their broadband routers) allow a variety of parameters.
      You can set a sustained rate, peek rate, and burst size. For example a common implementation would have the following values (I haven't worked with Cisco QOS much, so it may be implemented differently but the principals are the same):
      sustained rate: 2mbps
      burst rate: 10mbps
      Max burst size: 10 Megabytes

      The burst size counter is depleted as you download over 2mbps, and replenished when you download under 2mbps.
      When you download a 100MB file you will deplete the burst size at 8mbps. You can download at 10mbps for 10.5 seconds, at which point your download will drop to 2mbps and will stay there until you slow your transfer rate. If you stop downloading completely it will take 42 seconds to refill your burst counter.

    32. Re:This is an advertised feature I believe by SanityInAnarchy · · Score: 1

      That sounds great, as long as you provide the other side of it, too.

      For instance, say I paid for 6 mbits. Boost me to 100 mbits if you like for the first few seconds, but after that, give me my 6 mbits.

      I don't have a problem with Comcast "cheating" in this way. My problem is that you don't even get those 6 mbits you paid for ("unlimited" or not), you get "However much Comcast thinks you deserve" before they ban you for a year.

      --
      Don't thank God, thank a doctor!
    33. Re:This is an advertised feature I believe by Bert64 · · Score: 1

      Depends what the peers are...
      I run bittorrent on a fast colo box (100mb link), and for popular well seeded torrents often get download speeds upwards of 80mbit. Other people do the same, so even with a small number of seeds i can see very good speeds. Things like linux iso's tend to be seeded by fast servers (the same servers that host fast ftp mirrors usually), and its not unusual to get several mb/sec from a single peer.

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
    34. Re:This is an advertised feature I believe by sdsucks · · Score: 1

      I've got this feature from shaw. Works well. Using it I've seen speeds of 2.5MB/s for short bursts.

      Comes with the xtreme-i package.

    35. Re:This is an advertised feature I believe by the_B0fh · · Score: 0

      That's interesting. I could have sworn that my mail server serves me content faster than 1mb/s. Everytime I type "pine", it pops up immediately. And the peanut gallery who points out pine is a MUA, I point out that it's running on the box that's the MTA as well.

    36. Re:This is an advertised feature I believe by mds820 · · Score: 1

      Kinda like what slashdot members are doing during the late hours of the night...

    37. Re:This is an advertised feature I believe by electrictroy · · Score: 0

      P.S.

      I should add there's also FREE internet available in the United States. It's only ten hours a month but if all grandma does is check email or the tvguide every other day, that's all she needs.

      So here are your "variety of plans" for different usage patterns:
      - free
      - $7 for dialup
      - $15 for minimal broadband
      -~$40 for standard broadband
      -~$90 for maximal broadband

      The various companies offer the users different options based upon how much bandwidth we think we're going to need. If a low-usage pays more than what he/she needs, well then maybe they should downgrade & save some money. (IMHO).

      --
      The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
    38. Re:This is an advertised feature I believe by kiracatgirl · · Score: 1

      6 to 8mbps is very low bandwidth?! If you really believe that, you've been spoiled terribly.

    39. Re:This is an advertised feature I believe by the_cowgod · · Score: 1

      Indeed, and Slashdot already covered this last year.

    40. Re:This is an advertised feature I believe by gad_zuki! · · Score: 1

      Yeah someone needs to clue this guy into what a burst is. Short bursts are pretty nice as you can break past your limit for a short period. Most users just need short transfers not long sustains.

      Lastly, there might be an argument made that comcast has no interest in shaping traffic to bandwidth test sites and could raise the QoS to them. Why not? Its barely unethical.

    41. Re:This is an advertised feature I believe by nbert · · Score: 1

      Too bad most monitors like gkrellm don't let you select lo/lo0

    42. Re:This is an advertised feature I believe by xSauronx · · Score: 1

      I should not, since it came back to me, that even with our bursting, speedtests always showed the proper normal bandwidth. We usually uses the Speakeasy test site to check throughput and you could see the initial burst, then the throttled speed which is what was actually reported back as the result.

      --
      By and large, language is a tool for concealing the truth. -- George Carlin
    43. Re:This is an advertised feature I believe by SaDan · · Score: 2, Informative

      It's called "burst" on Canopy wireless equipment, and it works great.

      I imagine this is what Comcast is doing, and it's a very acceptable practice, as long as it's advertised properly.

      It works like this: Your sustained bandwidth feeds a "bucket" (measured in megabytes or megabits, not based speed/time measurements), which is your burst capacity. When you start a download, you will pull from this bucket, and run at the maximum speed possible for your connection. When the bucket is empty, you will continue to run on your sustained speed. When you go idle (your download finishes), the bucket will refill at the sustained speed rate.

      So, if you have a 50MB bucket size, and you can burst to 10Mbit/s, you will run at 10Mbit/s until you've downloaded 50MB, and then you'd drop to your sustained rate (say, 384Kbit/s). When you finish downloading, you will refill your bucket at 384Kbit/s until it either tops off or you start using your connection again.

      In my experience, with the equipment I've been using working at a WISP, this bucket applies to all connections, regardless of protocol or download size. YMMV, of course, depending on the hardware/software you are working with.

    44. Re:This is an advertised feature I believe by eviljames · · Score: 2, Interesting

      I use Shaw, have the "Extreme" 10mbps package, and get a pretty consistent 10mbps. The powerboost maxes out the capacity of their cable modems (25mbps) for 5-20 seconds and drops you back to your prescribed speed. In BC you can buy Shaw Nitro which puts you at 25mbps all the time. What Comcast is doing sounds more like selling the service at 10mbps, throttling their customers to 1.5 for every day browsing, and using this same PowerBoost when they run bandwidth tests. Which, ultimately, is fraud imho.

    45. Re:This is an advertised feature I believe by N7DR · · Score: 2, Informative

      Yes; this capability is built into DOCSIS (the most common generic name for it is "DOCSIS boost"). Some cable operators turn on the feature, some do not. Comcast not only turns the feature on, but markets it rather aggressively (I think they call it "Powerboost", to give it a sexy name). The feature allows cable operators to set a temporary higher bandwidth limitation for a user, and also to set how many octets are transferred before the user is relegated to their normal bandwidth limitations. It's all spelled out in DOCSIS.

    46. Re:This is an advertised feature I believe by PopeRatzo · · Score: 1

      Broadband, like dialup, is subsidized by the low use casual customers. Come to think of it, so's World of Warcraft, which I wish more of those "ubers" would realize before it's too late.
      There is nothing trollish in what _KiTA_ says. In fact, it's quite insightful. The "low use casual customers" are the ones who are subsidizing broadband for the rest of us. And that includes you, me, and the "college assclowns".
      --
      You are welcome on my lawn.
    47. Re:This is an advertised feature I believe by JasonTik · · Score: 1

      Does anyone know of any information somewhere about how to do this on your own systems? Given my family's browsing habits, This would probably be quite useful on my LAN.

    48. Re:This is an advertised feature I believe by anagama · · Score: 1

      For instance, say I paid for 6 mbits. Boost me to 100 mbits if you like for the first few seconds, but after that, give me my 6 mbits.

      I don't even get that for my $55/month for Comcast, but it's really obvious they are gaming the system. Here's a nice comparison:
      • Speakeasy: 5706 kbps down (note: 713.25 KB/s)
      • scp from a server I have: 100% 1122KB 124.6KB/s 00:09

      Yeah -- cheap server, ssh overhead, any other excuse. I know that there are times I'll be surfing and even google won't be loading. I go to speakeasy and still get high (for me) numbers. Comcast is expensive and it totally sucks. Thank's to their monopoly in my area, it's that or dial-up.
      --
      What changed under Obama? Nothing Good
    49. Re:This is an advertised feature I believe by jsebrech · · Score: 4, Funny

      If your client has a bandwidth chart, watch it scroll by and enjoy the thrill as your upstream bandwidth surges to heights like you have never seen before.

      Nobody should ever enjoy a bandwidth chart to the degree you are enjoying it. I don't know whether to be scared or awed.

    50. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      They are delivering exactly as advertised. Quit bashing them for this, this is one of the few times they're actually being fair and decent. Go bash them for torrent killing instead.
      Looking nice on short speed tests is just a side effect of making web pages load faster than long file downloads.

    51. Re:This is an advertised feature I believe by croddy · · Score: 5, Funny

      Hey man, I use Linux -- this is one of my favorite computer games.

    52. Re:This is an advertised feature I believe by jdev · · Score: 2, Funny

      You know, normal people just have aquariums.

      Link

    53. Re:This is an advertised feature I believe by Reziac · · Score: 1

      Standard caching. My dinky little local ISP does it too, tho not that dramatically. For the first 2mb or so, I get around 2.5Mbit instead of my standard 1.5Mbit. This is useful for stuff like webpages, not so useful for sustained downloads.

      --
      ~REZ~ #43301. Who'd fake being me anyway?
    54. Re:This is an advertised feature I believe by jimeh · · Score: 1

      since when were hardcore geeks "normal"? ;)

    55. Re:This is an advertised feature I believe by AutoTheme · · Score: 0

      I have I believe the 8Mbps service from Comcast and speakeasy shows:

      Download Speed: 7981 kbps (997.6 KB/sec transfer rate)
      Upload Speed: 2579 kbps (322.4 KB/sec transfer rate)

      My scp test to my internet host shows:

      Download: 100% 48MB 965.9KB/s 00:51 (it never dropped below 800KB and periodically hit 1.0MB)
      Upload: Took too long but averaged about 40.0KB/s

      So I'm fairly happy.

    56. Re:This is an advertised feature I believe by number11 · · Score: 1

      No peer can upload at those speeds

      With BitTorrent, Gnutella, Gnutella2, eDonkey, and some other networks, you've got the aggregate upload speed of many peers. If it's a sufficiently popular item, they'll fill all the bandwidth you have available. Singular peer to peer is so 20th century.

    57. Re:This is an advertised feature I believe by NickCatal · · Score: 1

      No, you need to be using like sub 1mbps (aka idling, only viewing individual pages on non multimedia sites, etc) before Comcast will give you another 12mbps boost. You always get at least 6 (or 8) Mbps to use, the other 6/4 you get as an extra 'bonus' for the small periods of time you may need it.

      --
      -nick
    58. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      Would you mind sharing this rule?

    59. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      They actually pull the entire peer list from the tracker packet headers, and send an RST to every peer, I believe. Hence the push for encrypting that information in the header.

    60. Re:This is an advertised feature I believe by mabinogi · · Score: 1

      then all promptly started going bankrupt until they switched back to a metered or quota system. (at least in Australia)

      --
      Advanced users are users too!
    61. Re:This is an advertised feature I believe by tubapro12 · · Score: 1

      Hmm I've never noticed a speed change on my connection with Cox, and they advertise a similar "Power Boost." I just downloaded an 800MB file and got 6.94Mbps over 17 minutes.

    62. Re:This is an advertised feature I believe by Linux_Bastard · · Score: 1

      I have comcast at home, and I have a 10Mbps plan, but I only get the 10Mbps infrequently. My typical speed is about 2Mbps. When I had the 6Mbps plan, the average speed was only about 1Mbps, and the best was about 4Mbps.

      They don't exactly deliver what they advertised. They are more than happy to point out that they have NO guaranteed level of service, only "Typical".

      As my primary usage is VPN the web page perception enhancements degrade my service and there is no opt out.
      All I want is an internet access provider, not a web page provider.

      --
      F X=0:1:9999 F D=2:1 Q:((X>2)&(X#D=0)!((D>X/2)&(X'=1))) I D>(X/2) W:$X>75 ! W X,?$X+5-$l(X) Q
    63. Re:This is an advertised feature I believe by LordMyren · · Score: 1

      log on to the server at try
      scp foo localhost:foo
      for any foo of significant size
      scp is slow yo.

      its not ssh overhead its synchronous block encryption cpu usage.
      thats not an excuse its a computational constraint.

      my comcast blows chunks too, i max about 100KB/s down from a VPS with no reserves about happily saturating a 10mbit upstream, but i'm not measuring with scp.

    64. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      if you want an accurate test of bandwidth, try http://performance.toast.net/, they use file sending to various server hosts, and that allows you to bypass the speedboost feature

    65. Re:This is an advertised feature I believe by rastoboy29 · · Score: 1

      Phfthsphth.  I'm paying out the nose for their "commercial" speeds, and I get at best 1mbps download.

      And upload still sucks, just sucks a little less.

      I am deeply unhappy because I have no other options, and it is overpriced.

    66. Re:This is an advertised feature I believe by NevermindPhreak · · Score: 1

      they never said in the article how much they were paying for. 1.5 Mbit down by 256 Kbit up is a common commercial speed bracket. not so common for residential customers, but there are many different factors that come into play in that pricing. i believe the original poster was saying that he thought Comcast was doing this specifically to look good on bandwidth tests.

      if you're not getting more than your apportioned amount, then your SpeedBoost isn't working correctly. make sure you have a modem capable of it, make sure Comcast has the right settings in your account ("oh, we forgot to add your SpeedBoost service"), and have a Comcast tech make sure you don't have any packet loss on your line.

    67. Re:This is an advertised feature I believe by SanityInAnarchy · · Score: 1

      its not ssh overhead its synchronous block encryption cpu usage.

      Out of curiosity, is this still a limiting factor if top doesn't show CPU usage at 100%?

      I mean, am I doing it wrong? I'm not the original poster, but look here:

      david@worf:~$ dd if=/dev/urandom of=foo bs=1M count=100 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 18.873 seconds, 5.6 MB/s david@worf:~$ scp foo localhost:~/foo.2 foo 100% 100MB 33.3MB/s 00:03 david@worf:~$

      (Whitespace truncated to fool lameness filter.)

      Am I doing something wrong? I mean, this is a fast laptop, but still. Let me make the naive assumption that 64-bit is twice as fast as 32-bit, and 2 cores are twice as fast as 1. I got 33.3 MB/s on a dual-2ghz 64-bit processor, so we're pretending that's equivalent to an 8 ghz single-core 32-bit processor.

      That means an 800 mhz, 32-bit machine should still be able to do 3.3 MB/s. By the same logic, at 80 mhz, you can do 300 KB/s, and at 40 mhz, you can still beat 150 KB/s, which is still faster than 124.6 KB/s.

      Those are a lot of naive assumptions, both ways. In fact, it's ludicrously un-scientific, without being able to test against an actual server. (And besides, if I was needing to test bandwidth, I'd probably use netcat instead, on a random port, with some random data.) I'd also be curious to run both tests from other places.

      But based on that, and on my experience with scp, I'd say that if you're getting less than about a meg per second on anything made in the last five years, scp isn't the limiting factor. That's a megabyte.

      --
      Don't thank God, thank a doctor!
    68. Re:This is an advertised feature I believe by Fallen+Kell · · Score: 1

      iptables -I FORWARD 7 -p tcp --dport YOUR_TORRENT_PORT_HERE --tcp-flags RST RST -j DROP

      --
      We were all warned a long time ago that MS products sucked, remember the Magic 8 Ball said, "Outlook not so good"
    69. Re:This is an advertised feature I believe by Fallen+Kell · · Score: 1

      Forgot, also the: iptables -I FORWARD 7, where the 7 is actually the rule number in the list of FORWARD rules. The lower the number, the higher the priority of the rule. You may need to have your rule set to a lower number then 7. For me, this is fine as the rules above it do not deal with forwarding rules would not "trump" this rule.

      --
      We were all warned a long time ago that MS products sucked, remember the Magic 8 Ball said, "Outlook not so good"
    70. Re:This is an advertised feature I believe by NateTech · · Score: 1

      Comcast also has "commercial" levels of service beyond the "residential" services. I have a 6Mb/1Mb guarantee from them at a higher price than residential service, and the "PowerBoost" allows 12Mb/2Mb burst up/down.

      I've tested it regularly with large files, and I regularly see higher than 6Mb down continuously.

      You get what you pay for. Like in everything.

      --
      +++OK ATH
    71. Re:This is an advertised feature I believe by Bert64 · · Score: 1

      Strictly speaking they are only "forging" the identity of an IP address they own.

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
    72. Re:This is an advertised feature I believe by SanityInAnarchy · · Score: 1

      ...and it still doesn't look right.

      david@worf:~$ dd if=/dev/urandom of=foo bs=1M count=100
      100+0 records in
      100+0 records out
      104857600 bytes (105 MB) copied, 18.873 seconds, 5.6 MB/s
      david@worf:~$ scp foo localhost:~/foo.2
      foo 100% 100MB 33.3MB/s 00:03
      david@worf:~$

      There we go. Of course, it doesn't preserve whitespace now...

      --
      Don't thank God, thank a doctor!
    73. Re:This is an advertised feature I believe by _KiTA_ · · Score: 0, Flamebait

      Broadband, like dialup, is subsidized by the low use casual customers. Come to think of it, so's World of Warcraft, which I wish more of those "ubers" would realize before it's too late.

      There is nothing trollish in what _KiTA_ says. In fact, it's quite insightful. The "low use casual customers" are the ones who are subsidizing broadband for the rest of us. And that includes you, me, and the "college assclowns".

      BTW, I specifically call out college students as assclowns as they tend to have that oh so magical combination of:

      1. Ignorance
      2. Entitlement Syndrome (You "owe" me a huge unlimited connection)
      3. EXTREMELY high usage patterns (Napster, BRO!)
      4. Arrogance.

      We had SOME assclowns that were just retired people who were bored, or alpha users, but by and large it was college aged students who somehow saw nothing wrong with stealing thousands of dollars worth of music and somehow felt we owed them a 5 megabit connection (used 100% 24/7) when they were paying for a 128k connection.

      Perhaps calling them "college assclowns" was a bit harsh, but you have to understand, I've been on both sides of the fence, as an ISP technician, and as a user that was overusing our service so much that the owner of the company had to come up to me and tell me to knock it off.

      The myth of unlimited bandwidth is just that, a myth. I donno if my ISP was unique as it was somewhat smaller than, say, Comcast (although, we weren't going billions in debt as a business plan in hopes of being bought out later like the big boys like Comcast do, either), but our set up, well, as such:

      We had a series of very large antennas with Motorola Canopy Wifi equipment and large antennas on them. At a client side, we had a Wireless bridge hooked up to a 12" antenna pointing at our tower. This setup allowed us to get about a 10 mile range out of them, give or take, which is how we solved the "last mile" problem -- we could get 128k connections out to people who won't have Cable or DSL in the next 10 years.

      The problem was, we didn't actually have any way to cap people at 128k. Which means, you paid for 128k, but you got whatever the tower gave you. I usually clocked around 2 megabit myself, and I was pretty far from the tower.

      The downside to this is if you were an assclown, like I myself was, you could fire up eMule, Gnutella, or Bittorrent, all of which are designed to break through bandwidth throttles by simply DDOSing the network into submission, and get 2-3megabit, guaranteed. The problem is, anyone else on that tower would be getting jack and squat.

      Given that Cable works on a similar system -- a set amount of bandwidth is sent to a neighborhood, you pay for a certain minimum level of service but get whatever you actually can get from the neighborhood's pipe, etc -- I imagine that Comcast has the same problem with assclowns that we did.

      Now, you have to understand, for the most part, it's not the assclowns we were upset with. Most of the initial assclowns were happy to dial it in -- for example, eMule, Gnutella, Bittorrent, etc, they're all set up out of box to open up hundreds (and in some Gnutella clients, thousands) of concurrent connections in order to break past individual connection throttles. If we contacted these guys and walked them through setting their Bittorrent to say, 1 file at a time, 30 max connections, their impact on the tower was much less than if they refused to do anything and were just going to queue up 7 or 8 thousand copies of P-diddle's latest until they got a real one off eMule.

      The real problem wasn't these assclowns. Remember, I was an assclown myself. The problem was when their assclowning around caused the grandmas to notice that their internet was slow or outright offline, and when we went out to fix it, realized that they were connecting to the tower just fine, it's just that the tower's full. "Sorry, we can't do anything, just live with it... oh wait, you

    74. Re:This is an advertised feature I believe by Anonymous Coward · · Score: 0

      Perhaps this is why Comcast is so keen on disrupting BitTorrent traffic. If something uses many small connections to disparate sources to transfer one file, each connection would be get the "SpeedBoost" and the overall transfer speed would be significantly faster.

      Perhaps Comcast isn't really being malicious about it but is caught in a situation where a feature they offer is incompatible with a new technology that is starting to dominate internet traffic. In that case, their strategy could be considered somewhat understandable if it was viewed as a stop-gap solution until they can update their networks to identify BitTorrent traffic and apply the "SpeedBoost" accordingly.

      Like the old saying...never attribute to malice that which can be adequately explained as incompetence.

  2. Powerboost by SquierStrat · · Score: 5, Informative

    This is because of powerboost. As I understand it, powerboost makes the first 20MB download at a higher rate than your advertised bandwidth. Since bandwidth tests are done on such small files, you get a worthless result. The idea is that people who download lotsa of relatively small files get better performance, where as people downloading a lot of huge files like ISO images, full length movies, et cetera willg et initially good speed but after 20MB will feel like they are getting gipped.

    --
    Derek Greene
    1. Re:Powerboost by IndustrialComplex · · Score: 4, Insightful

      I suppose it depends on how much it drops for those larger files. If it goes from 10Mbps to 1 Mbps I could see the point, but if it only drops to something lik 7 or 8 Mbps I think that's a reasonable rate. We also have to remember that this is a residential connection. It is designed for the typical residential user. That type of person will download a lot of smaller files regularly. The result is that the web browsing will seem very fast. ISO downloads? Not so much.

      I wonder how it deals with P2P or a multi-streams of data. What if I have 10x 30Kbps streams running simultaneously would that aggregate and trigger the throttle down mechanism?

      --
      Out of modpoints but really liked a post? 1BDkF6TtmmeZ3yqXbz9yhdYVqRYnwFoXDj
    2. Re:Powerboost by kvezach · · Score: 2, Interesting

      Sounds like that could be tricked... instead of downloading a single ISO file, download 35 20MB files at boosted speed. Write a script to automate it, even. Or am I wrong here? If they disregard connections and turn off the boost after 20MB from when you first connected, then just downloading 21MB and disregarding the results for the first 20 should return the correct results for bandwidth tests.

    3. Re:Powerboost by FritzTheCat1030 · · Score: 5, Informative

      I have Comcast's advertised 8 Mbps service and I very consistently get that downloading large files off of Usenet. I get about 25 Mbps for the first 20-30 seconds after I start a download.

    4. Re:Powerboost by petecarlson · · Score: 2, Informative

      Imagine it like a bucket with a fill rate of X and a drain rate of 10X. No matter how you work it, you are only going to get data over the long term at rate X although over the short term you could get speeds of 10X till your bucket is full.

    5. Re:Powerboost by TheLink · · Score: 2, Insightful

      Well if I did it, the boosts will be on a per customer IP basis. Not per connection. You would then have to be able to successfully _request_ for a new different and valid source IP address every few seconds, and then do the downloading. Good luck with that.

      Comcast might do things differently.

      --
    6. Re:Powerboost by morgan_greywolf · · Score: 1

      It's also important to understand that speed varies a lot by traffic, too. If you and thousands and thousands of other people are competing for bandwidth to download the latest Ubuntu ISO the day it comes out, say, in April, using the mirrors rather than a torrent, you're probably not going to get anything close to your 'advertised speed' -- and, in fact, in some cases you may be lucky to get anything at all.

      And we know how Comcast deals with P2P data -- it inserts random RSTS to 'shape' their traffic using a man-in-the-middle DoS attack.

    7. Re:Powerboost by Anonymous Coward · · Score: 0

      Same here. Im happy overall with the internet service. Not so much with the bundled overpriced TV service.

    8. Re:Powerboost by QuietLagoon · · Score: 2, Informative
      While I was looking around for into on PowerBoost, I ran into these comments:

      A Comcast official said the company is not boosting speeds for particular applications or content, a situation that would likely get Comcast into hot water with Net neutrality proponents, who want network operators to provide the same level of service to all content providers on the Net. Instead it's supercharging speeds for all customers downloading any content--whether it's music, e-mail, pictures or movies--when the network is not being used at maximum capacity.

      "The Comcast network is really content-agnostic," said company spokeswoman Jeanne Russo. [/quote]

    9. Re:Powerboost by Anonymous Coward · · Score: 0

      They should advertise their anti-speed boost competitor option. I use a rival ISP and whenever I download legal torrents, half the time my DSL router not only gets forged rst packets, but also some sort of reboot command.

    10. Re:Powerboost by Anonymous Coward · · Score: 0

      feel like they are getting gipped.

      People of Romani descent consider "gypped" to be a racist term.

    11. Re:Powerboost by Anonymous Coward · · Score: 0

      And that concept messes with QOS, well at least the limited QOS that I've messed with on MonoWall and my Linksys router with other firmware. If you set the max bandwidth in the QOS settings to your advertised normal bandwidth rate, you do not get the advantage of Comcasts "Speedboost". Setting your bandwidth to something higher to get some speedboost, the QOS gets jacked when the speedboost bucket runs dry.

    12. Re:Powerboost by QuantumPion · · Score: 1

      Same here, although on my connection, late at night, I've gotten powerboost speeds for whole large file downloads. I downloaded one divx game trailer which was 600 mb in about 2.5 minutes! That's an average of 32 mbps! I really dislike Comcast's business practices, but I can't really complain about the service at my location.

    13. Re:Powerboost by Bob+Gelumph · · Score: 1

      It's not a Netgear WGT624 V3 is it?
      I have one of those and using BitTorrent crashes the router, though V2 of the same router worked fine (until an official firmware update bricked it).

      --
      I'm gonna need a spec.
    14. Re:Powerboost by mxs · · Score: 1

      I wonder whether any download managers already account for this kind of crap. It should be trivial to code managers that reset the connection every 15-20 seconds.
      Sure, it ain't pretty on the servers, but the brainiacs at ComCast don't care.

    15. Re:Powerboost by Anonymous Coward · · Score: 0

      Who cares about the Romani?

    16. Re:Powerboost by znerk · · Score: 1

      feel like they are getting gipped. People of Romani descent consider "gypped" to be a racist term. People of other heritages mostly don't realize where the term "gypped" originated, or just how accurate it was at the time it came into use. Think of it this way, if it weren't stereotypical behavior, the term would never have come about.

      As an aside, don't wave the race card in our faces, when most people don't even associate the term in question with any particular race/class/credo.

      Besides, nowadays, people are getting used to being ripped off by *everyone*.
      --
      This work is licensed under a Creative Commons Attribution 3.0 Unported License.
    17. Re:Powerboost by Anonymous Coward · · Score: 0

      Where did you get your math from. 2.5 minutes is 150 seconds. If you averaged 32mb/s that would be 4800mb not 600mb. You actually averaged 4mb/s and probably pay for 6mb/s.

    18. Re:Powerboost by harryk · · Score: 1

      I'm sure you're aware of mac address spoofing. If I were really in the need of this type of bandwidth (and a comcast customer ... I'm not) .. I'd write a script that changed the reported MAC address released/renewed the IP and started on the next file.

      Personally, I'd rather pay up front for a consistent higher speed. I do. I pay an extra $5 (or something cheap, I don't remember exactly) and I get an additional 8mbit down, and an additional 640Kbps up, for a total bandwidth of 15Mbit down / 1Mbit up.

      I'm happy, and I think that if this is really a feature that Comcast is selling, another nice feature would be allowing a user to the opportunity to turn it off, maybe from a user's account owner page?

      Just a thought.. I'm rambling...

      harryk

      --
      think before you write, it'll save me moderator points.
    19. Re:Powerboost by Mister+Whirly · · Score: 3, Insightful

      ""The Comcast network is really content-agnostic," said company spokeswoman Jeanne Russo."

      This is technically kind of true.
      They are not protocol-agnostic though. But content, sure. They block both "illegal" and legal bittorent files, so they are not examining the content, they are just making assumptions without really looking.

      --
      "But this one goes to 11!"
    20. Re:Powerboost by nacturation · · Score: 1

      Where did you get your math from. 2.5 minutes is 150 seconds. If you averaged 32mb/s that would be 4800mb not 600mb. You actually averaged 4mb/s and probably pay for 6mb/s. Obviously the "600 mb" is meant to be "600 MB":

      http://www.google.com/search?q=600MB+%2F+2.5+minutes+in+Mbps

      Not many people would say they downloaded six hundred megabits.
      --
      Want to improve your Karma? Instead of "Post Anonymously", try the "Post Humously" option.
    21. Re:Powerboost by luke2063 · · Score: 1

      It is possible that GP meant 600MB rather than 600Mb, which would work out at 4MB/s (32Mb/s)

    22. Re:Powerboost by Your.Master · · Score: 2, Funny

      And nobody would say they downloaded 600 millibits.

    23. Re:Powerboost by TheLink · · Score: 1

      How does Comcast switch off customers who don't pay?

      As for this particular complaint, I don't think Comcast is doing anything wrong. Bursting is a useful feature.

      It will cost a lot more to provide sustained 2X bandwidth, than to provide a burst of 4X bandwidth for 5 seconds, after say 15 seconds of low usage. The first might make you happy, but the second would make a lot more people happy - the web surfers, the people streaming videos/audio would also be happy - the burst will shorten the "please wait, buffering..." period. Even the mail downloads might go better.

      I'd personally be happy with just 1Mbps down and 1Mbps up, but I want very low latency :). Providing higher bandwidth is easier than providing low latency.

      --
    24. Re:Powerboost by nacturation · · Score: 1

      Touché!

      --
      Want to improve your Karma? Instead of "Post Anonymously", try the "Post Humously" option.
    25. Re:Powerboost by MadUndergrad · · Score: 1

      Hmmph. I have Comcast's advertised 6 Mbps service and I very consistently get 500Kbps. Actually considering switching to 1.5Mbps DSL to see if it's faster.

    26. Re:Powerboost by Bert64 · · Score: 1

      Bittorrent keeps a lot of connections open, low end routers can't keep so many active connections in their state tables so they end up falling over.

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
  3. Come on by Anonymous Coward · · Score: 1, Funny

    Seriously now, is _anyone_ surprised over _anything_ bad Comcast does to their customers anymore?

    1. Re:Come on by znerk · · Score: 1

      Seriously now, is _anyone_ surprised over _anything_ bad corporations do to their customers anymore? There, fixed that for you.
      --
      Man, I'm grumpy this morning.
      --
      This work is licensed under a Creative Commons Attribution 3.0 Unported License.
  4. HTTP by hesiod · · Score: 1

    Most traffic is HTTP, being very small files. If it starts off very quickly, most web browsing would go extremely fast, while larger files would go at "normal speed"

  5. Easy by RalphSleigh · · Score: 2, Interesting

    Speed up web browsing for their customers while keeping those dirty bittorrent pirates at bay?

    --
    Come as you are, do what you must, be who you will.
  6. SpeedBoost by Fenis-Wolf · · Score: 1

    What you're seeing is expected behavior. Comcast's SpeedBoost technology maxes out your connection for an arbitrary number of seconds at the begining of a transfer, and then reverts to a normal speed. If you watch their commercials advertising SpeedBoost closely you will see the disclaimer at the bottom of the screen.

    --

  7. Makes Web Browsing Seem Faster by dleewo · · Score: 1, Redundant

    The majority of the downloads would be for web pages which are pretty small. I would think that's the reason they do this as it would make the web browsing experience seem faster.

    1. Re:Makes Web Browsing Seem Faster by brusk · · Score: 1

      It could also be good for streaming video/audio: get enough into the buffer to start playing in a couple of seconds, then keep streaming at a more leisurely (but still sufficient) rate.

      --
      .sig withheld by request
    2. Re:Makes Web Browsing Seem Faster by sunking2 · · Score: 1

      For anything of length, this would actually be bad. You would quickly fill up your buffer, fooling the player into thinking it can sustain a rate that it can't. The result, 30 seconds into the movie you start clunking along. Reliable streaming depends on a constistent rate.

    3. Re:Makes Web Browsing Seem Faster by Shakrai · · Score: 2, Interesting

      Reliable streaming depends on a constistent rate.

      Sure about that? I've watched how Netflix instant view uses my connection -- it pegs it for about 20-30 seconds at a time (8Mbits) and then idles for a period before downloading again. It never maintains a constant transfer, except for the first two or three minutes of watching (presumably filling up the buffer?).

      In the end it averages out to around 2.2Mbps, but the actual transfers themselves usually come in bursts.

      --
      I want peace on earth and goodwill toward man.
      We are the United States Government! We don't do that sort of thing.
    4. Re:Makes Web Browsing Seem Faster by brusk · · Score: 1

      Depends on how the software is set up and what the speeds are. If it's more or less a fixed rate, and it's high enough to max out the potential of the stream, then this is a good idea. Most streaming video isn't about the lower, post-burst level of this system. Certainly not Youtube, and not even something like Netflix or Hulu. But all the players seem to want a certain amount of data before they start playing. This means they get that data faster, and if the bandwidth required by the stream is sustainable, it's fine. But yes, if the post-burst bandwidth is too low, it could cause hiccups. But how many streaming sites want over 5 MB/s?

      --
      .sig withheld by request
  8. Compression by sumi-manga · · Score: 0

    They use packet compression and your bandwidth tester reports seeing more data than it truly does.

  9. Gasp! by Oxy+the+moron · · Score: 3, Insightful

    Comcast? Dishonest? Say it ain't so!

    All kidding aside, this wouldn't surprise me too much. Comcast (and probably all other providers) are advertising this super-mega-intarweb speed as "up to x mbps." So, theoretically, as long as *one* site can provide data at that rate, their marketing garbage still stands. Even if 99.9% of the other websites top out at 4kbps, if Speakeasy's speed test says it can transfer a file at 15mpbs, technically Comcast is correct. They are giving you "up to 15mbps."

    --

    Proudly supporting the Libertarian Party.

    1. Re:Gasp! by dal20402 · · Score: 2, Interesting

      The usual Slashdot "assume dishonesty before checking out the facts" attitude...

      Except that they only advertise 8Mbps sustained speed, which is what you get. They also advertise PowerBoost, which gets you ~25Mbps for a few seconds.

      Comcast needs to be drawn and quartered over their forged packets, but they haven't done anything dishonest in advertising their speeds, at least not where I live. I do indeed get >20MBps for a few seconds and then 8MBps until the cows come home.

    2. Re:Gasp! by Oxy+the+moron · · Score: 1

      I assumed no dishonesty. I'm not a Comcast customer, and I don't pretend to know how good or bad their service is or know what range of services they offer. I have AT&T U-Verse, so I know that the "three fingers pointing back" rule applies if I were to make fun of them or call them liars/cheaters/etc. I simply pointed out that most people are unaware that they are buying "up to" whatever speed is advertised, and that they are not guaranteed to receive that speed at any point in time. In theory, if the scenario I outlined were in fact true, Comcast would not have over promised because there is at least one scenario where that download speed could be achieved.

      But if Comcast (the company that forges/injects content into its subscribers packets without their knowledge) were to do that to hook a few extra customers, it shouldn't exactly qualify as a surprise.

      --

      Proudly supporting the Libertarian Party.

    3. Re:Gasp! by WhiteWolf666 · · Score: 1

      Not in the least bit dishonest. There are *many* faults with Comcast, but this aspect of their service (and, I think, their Sandvine throttling of bittorrent) are totally legitimate.

      Comcast advertises their connection like this: a 6 Mbps download, 384 upload, with a temporary "up to 20 second" boost to 12 Mbps download and 2 Mbps upload.

      How is this _at all_ disadvantageous to the customer? If you are downloading small files, or browsing the web, you're golden. And by small I mean 5-15 Megs, which is actually a significant amount of data.

      *About their "throttling" of bittorrent. First, it _only_ affects seeding, not when the when you are downloading and uploading. And it only throttles uploading when you are affecting network capacity. In the mornings, or late evenings, I see my seeds upload properly. Isn't this how a well managed network is *supposed* to work?

      For god sakes people; its obvious that we aren't paying for 16 Mbps guaranteed bandwidth. We're paying for best effort, and who doesn't want to see interactive tasks prioritized over bulk transfers (small files versus large files?). Also, I've got the "Blast!" service from Comcast, and while I don't always see my 16 Mbps, I generally see above 10 Mbps.

      Are they dishonest? Sure, their service costs too much, and they have these extremely goofy discount pricing schemes. Plus, their customer service isn't the best. But is their network management poor? I don't think so.

      --
      WhiteWolf666 an exBush supporter. All you new-school,compassionate,save the children Republicans can rot in hell
    4. Re:Gasp! by illumin8 · · Score: 1

      I don't want to start a holy war here, but what is the deal with you Comcast fanatics? I've been sitting here at my freelance gig on a Comcast cable connection (6 mbps down/1 up) for about 20 minutes now while it attempts to download a 17 Meg file from a web server. 20 minutes. At home, on my DSL connection (1 mbps down/256kbps up), which by all standards should be a lot slower than Comcast, the same operation would take about 2 minutes. If that.

      In addition, during this file transfer, Netscape will not work. And everything else has ground to a halt. Even telnet is straining to keep up as I type this.

      I won't bore you with the laundry list of other problems that I've encountered while working on various Comcast connections, but suffice it to say there have been many, not the least of which is I've never seen a Comcast connection that has run faster than its DSL counterpart, despite the Comcast's faster network architecture. My DSL connection with it's 1 mbps down runs faster than this cable modem at times. From a productivity standpoint, I don't get how people can claim that Comcast is a superior network.

      Comcast addicts, flame me if you'd like, but I'd rather hear some intelligent reasons why anyone would choose to use Comcast over other faster, cheaper, more stable ISPs.

      --
      "When the president does it, that means it's not illegal." - Richard M. Nixon
    5. Re:Gasp! by ardin,mcallister · · Score: 1

      Actually, they "throttle" BitTorrent traffic all day long, all night long. I could have my computer log the RST packets if you'd like. I have iptables set to block rst packets on my bittorrent port.

      --
      "Some men just want to watch the world burn..."
    6. Re:Gasp! by ScrewMaster · · Score: 1

      All kidding aside, this wouldn't surprise me too much. Comcast (and probably all other providers) are advertising this super-mega-intarweb speed as "up to x mbps."

      This bottle of fruit juice I'm drinking says it contains "Up to 10% real fruit juice!", which means it probably has none at all.

      You know, there are certain professions that are illegal in most parts of the U.S. The oldest one, prostitution, for example. I'm inclined to think that "marketing person" should be placed in much the same category.

      --
      The higher the technology, the sharper that two-edged sword.
    7. Re:Gasp! by Bert64 · · Score: 1

      Their service costs too much?
      It's pretty cheap for what you get, and the only way they can keep this price point sustainable is by shaping heavy users. It works based on the fact that most users use only a fraction of the available bandwidth.
      Even paying for a 6Mbps guaranteed rate would cost you considerably more, remember 6Mbps is 4x T1 speed, although with 4 T1 lines you'd get better upstream.

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
  10. Wouldn't it help with browsing speeds? by Tranvisor · · Score: 4, Insightful

    Most internet browsing is with relatively small amounts of data, so wouldn't front-loading of this nature noticeably increase browsing performance? Since this kind of performance is noticed by the majority of users it would seem to be something that increases their perception of their connections' speed.

    I'm not saying that Comcast might not be cheating on purpose for speed tests, I just think that there might be another reason behind it other than just to make their test scores artifically high.

  11. And it's old by Ulrich_Skarsol · · Score: 0

    Comcast has been doing this for at least 8 months (thats how long they've been in my market) so it's not like this is something new...

  12. Web browsing optimisation by jackhererUK · · Score: 5, Informative

    Sounds like they have simply optimised their network to favour "bursty" usage, for example web browsing. This would seem a sensible thing for a consumer ISP to do.

    1. Re:Web browsing optimisation by GodCandy · · Score: 2, Insightful

      I would have to agree. Most "normal" internet traffic is very bursty. You load the page then you sit there and look for a minute and then you load another. Sometimes you get the wild hair to download something large, at which point the provider limits your connection to prevent there network from becomming saturated. It is a resonable thing to do. I can't argue with it as long as the provider is stating that this is a few secconds at the beginning of a connection and will not sustain for the duration of your download of all 6 Star Wars DVD's.

  13. Front-Load by Smidge204 · · Score: 1, Redundant

    Is there any valid reason why Comcast would front-load transfers in this way

    Your average webpage is not 100+MB. If they give you full bandwidth for, say, 2 seconds - most reasonable webpages will download completely within that time. It's not "cheating" exactly since they don't guarantee those speeds, but "up to" those speeds. They're not the only ones who do it, either.

    Still a sleezy thing to do...
    =Smidge=

    1. Re:Front-Load by Anonymous Coward · · Score: 0

      Yes, so sleazy. HOW DARE THEY provide more bandwidth to you! The sheer unmitigated gall of it!

    2. Re:Front-Load by Smidge204 · · Score: 1

      Fine. I'll sell you a car that gets "up to 120MPG*! Drive nearly 5x farther than ordinary vehicles!"

      It's not sleezy if I can proove that kind of fuel economy, but I never tell you that it only applies to first first mile once you drive it off the lot? You wouldn't feel just a bit bothered about paying for something and being deliberately shortchanged on the deal?

      Here's a wild concept: Don't promise what you can't deliver!
      =Smidge=

  14. it's called PowerBoost by Anonymous Coward · · Score: 0, Redundant

    Your bandwidth is increased for short periods of time. It's advertised all over the place.

  15. This is most likely "PowerBoost" by drcagn · · Score: 2, Informative

    http://www6.comcast.net/powerboost/

    All it does is give you short bursts of high bandwidth and is really more talk than usefulness.

    My ISP, Cox, does this too, though once the "PowerBoost" thing is off, I steadily get the bandwidth I'm supposed to get. Dunno about Comcast.

    --
    Scorta futuere amo!
    1. Re:This is most likely "PowerBoost" by POTSandPANS · · Score: 1

      It's like if you do a speedtest on your hard drive with the cache enabled vs disabled. It works quite nicely for webpages and email. Where it really messes thing up is a streaming video. The video downloads the first bit extremely fast, and the player believes it's cached enough to start playing the video (based on extremely fast connection speed). Next the speed drops to normal, the player runs out of cached video and it stops to re-buffer again.

    2. Re:This is most likely "PowerBoost" by pock3ts · · Score: 1

      I use Cox as my ISP and I have to agree with you. Whenever, the PowerBoost drops off my speed drops down to a fairly typical speed for the bandwidth i'm paying for. The drop is not quite as dramatic as what dynamo52 seems to be having on Comcast. Now of course I am paying for the fastest package (12-15 meg down / 1 meg up). So the speed a customer is paying for may make a difference in the dramatic drop off in speed after the PowerBoost.

  16. SpeedBoost is the thing by eebra82 · · Score: 4, Informative

    Several months ago, New Englanders were the first consumers to experience Comcast Communications' latest high-speed Internet upgrade - PowerBoost Speed Enhancer. The speed upgrade is now being rolled out to Comcast customers nationwide. This new network technology temporarily doubles Internet speeds for consumers subscribing to the company's 6 megabits per second and 8 Mbps services, bringing download speeds to 12 Mbps and 16 Mbps, respectively.

    Some consumers may not notice the speed increase when downloading smaller files, such as text-based e-mails and simple Web sites with few graphics. However, customers who frequently download large files, such as software, games, music, photos, and videos will now download at speeds that are faster than ever before. For example, PowerBoost significantly reduces the time it takes to download a one hour television program. Comcast subscribers at the 6 Mbps tier would reduce their wait time in half - from 4 minutes and 29 seconds to 2 minutes and 15 seconds. And MP3 fans will be able to download music files as fast as 2.2 seconds! See more here
  17. Token Bucket by Anonymous Coward · · Score: 5, Informative

    Um, this isn't a new concept, nor is it particularly sneaky:

    http://en.wikipedia.org/wiki/Token_bucket

    1. Re:Token Bucket by thsths · · Score: 1

      > Um, this isn't a new concept, nor is it particularly sneaky:

      Hey, this is slashdot. You may have heard of it 10 years ago, and so did I, but you have to take into account all the youngsters that are not around that long. After all, downloading songs from iTunes is much more fun than studying traffic shaping. As long as your song fits in the bucket.

  18. This is advertised by bconway · · Score: 0, Redundant

    It's called PowerBoost. It's advertised on TV and radio every 5 minutes. They even have a FAQ about it. Google just might have a hint of it, too. Come on...

    --
    Interested in open source engine management for your Subaru?
    1. Re:This is advertised by Anonymous Coward · · Score: 0

      You may be surprised to hear this, but 90% of those comcast ads you see on TV are overlaid on a network ad, so people who aren't on Comcast see something else. People who don't have Comcast will rarely see Comcast ads.

    2. Re:This is advertised by znerk · · Score: 1

      That's for "word of mouth" advertising. It's fairly simple, really. You go to a friend's house, they have comcast tv, and their tv is always on, even if "nothing is on tv". You see and hear comcast ads when you're at your friend's house, and begin to associate comcast with the friend... thus making you more "friendly" towards comcast. Next time you're thinking about being disatisfied with your internet/tv/phone service, you may give comcast a call.

      Wow. It's kinda scary that I even think like that. Maybe I should get a job in the advertising sector.

      On the other hand, maybe I should just be glad that the only "boob tube" in my house is my 21" CRT monitor. I've been stupefying cable companies for years with the line "I don't have a television" when they offer me some fantastic package deal to go with my internet. You know those "traps" they put on the line so you can get HBO and such? The line coming to my house has one that *blocks* TV signals. Seems they don't trust me not to use their cable to watch television signals on my non-existant TV. On the other hand, it saves me $10/month to not purchase even their "basic" television service, and if they want to install a blocking device for a service I have no intention of using, I'll just chuckle and shrug.

      Similarly, I don't get telemarketers, because my house doesn't have a phone. Each person living in it carries a cell phone, as do almost all of my friends who come over. At any given point in time, there are typically at least one, if not *three* phones in my house. So, explain to me again why the house would need its own voice communication line?
      --
      Yeah, I'm off-topic. So?

      --
      This work is licensed under a Creative Commons Attribution 3.0 Unported License.
    3. Re:This is advertised by Bert64 · · Score: 1

      I can understand not showing the ads to people in comcast service areas, as they wouldn't be potential customers anyway...
      But only showing the ads to existing customers? How do they intend to attract new customers?

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
  19. It gives priority to interactive tasks by Anonymous Coward · · Score: 1, Interesting

    The total bandwidth for all ISP's is limited and people moving large files can dramatically affect the experience of interactive users. Give priority to the user who is clicking on a lot of small web pages and they will get better response. Non-interactive tasks like downloading don't need that kind of response.

  20. There's only one... by Anonymous Coward · · Score: 0

    There's only one kind of bandwidth test- uploading and downloading a large file. I don't know what else the author was doing, but it sure wasn't "bandwidth testing"- "burst-speed testing", maybe?

    Advertised xfer speeds seem to be false, in general. This won't change until more people are aware and complain- (i.e., no time soon).

  21. Its not cheating Its great feature.... by jozmala · · Score: 1

    Think typical internet usage, its bursty. For more typical user case of relatively small files you get a nice boost in performance. If you download something bit then its another matter. The quick gives improves web surfer latency without taking much of the bandwith. They have limited bandwith and they probably cannot give that kind of speed up all the time.

    --
    ©God :Copyright is exclusive right for creator to determine the use of his creation.
  22. Nothing wrong with PowerBoost by EmagGeek · · Score: 1

    Oh come on people. Can you please just stop the witch hunt? Comcast advertises this as a feature, and to me it's actually pretty convenient. I can imagine that most downloads are probably less than 10MB in a single burst, so giving the user the first 5 seconds or so of transfer at a higher rate helps the consumer see a faster internet. Keeping sustained transfers at the advertised cap speed ensures one user can't gobble up all the bandwidth over a prolonged period of time. Everybody wins.

    This is not too different than how metered T/OC-x connections are operated. These metered T/OC-x connections bill you based on your sustained bandwidth, so yeah, you can have short bursts without getting a gigantic bill, but if you are pegged at 50% all the time, your bill will be huge.

    1. Re:Nothing wrong with PowerBoost by ampsonic · · Score: 1

      As long as comcast is upfront about how this technology works (which may be unlikely), it seems to be a useful feature. If most users see improved speeds over most of their internet use (ie: webpages, emails) it doesn't seem like a problem.

      Are they adveritising there service at the powerboost speed or at the speed it drops to?

    2. Re:Nothing wrong with PowerBoost by EmagGeek · · Score: 1

      http://www.comcast.com/customers/faq/FaqCategory.ashx?CatId=377

      This explains everything about PowerBoost. In short, they do not advertise the maximum speed at which the connection will operate during the burst. They explain clearly that your connection will run at your provisioned speed after the burst is over.

  23. Tin foil bushes. by Anonymous Coward · · Score: 1, Insightful

    "Is there any valid reason why Comcast would front-load transfers in this way, or is it merely an effort to prevent end-users from being able to assess their bandwidth accurately?"

    The thing I'd like to know is how you all make it through the day seeing conspiracies and evil doers behind every bush? I'd think you'd burnout.

    1. Re:Tin foil bushes. by Dimitrii · · Score: 2, Insightful

      I'd think you'd burnout. I've worked with quite a few conspiracists and finding a new one seems to invigorate them. It is a positive feedback loop that can be quite entertaining if you don't get as invested in making them see the truth as they are for you.
  24. may be there is no malice here? by Anonymous Coward · · Score: 1, Interesting

    If what you say is true, there is a possibility comcast is doing it with good intentions. In mainframes, we have a concept of "period performance objective", the main idea being transactions which complete in short intervals get priority over transactions that take longer. Every transaction (in a group) will start with same priority, if it doesnt complete by a predefined period, its priority gets lowered a notch. if the transactions didnt complete in the next period too, the priority gets lowered even further. the period length, number of periods, and the quantum of reductions are all customizable. This is usually defined for online users. so a user executing a transaction that takes 0.1sec will keep getting faster response, whereas a user executing a 10sec transactions will get sluggish response. so, comcast may be doing the same. it is protecting ordinary browse or chat or email from heavy downloaders.

  25. Not cheating by Anonymous Coward · · Score: 0

    This behavior from ISPs is not uncommon and not a trick: http://en.wikipedia.org/wiki/Leaky_bucket
    Comcast may do many fishy things, but this is not one of them. As far as I know, the steady-state rates are as advertised and the burst rate is just an added bonus.

  26. Seems normal by pembo13 · · Score: 1

    I've come to the conclusion that those Speakeasy tests are way too optimistic on my RoadRunner connection as well. Need to find a more reliable way of testing. I wouldn't be surprised if ISPs just simply boost connections to Speakeasy as well -- would at least explain how when browsing all other sites is slow, and then doing the Speakesy test I get a high score.

    --
    "Thanks for all the money you paid to us. We've used it to buy off ISO among other things" -Microsoft
  27. The only way to determine speeds by nlitement · · Score: 1

    The only way to determine speeds is by torrent because any amount of latency will reduce bandwidth over TCP, so to compensate for that we need to connect to as many fast clients as possible, that are as close as possible to you. I've gotten 24150kbps down and 2050kbps up on torrent.

    Oh, but we're talking about the American ISP Comcast.. that throttles everything.

    1. Re:The only way to determine speeds by Bert64 · · Score: 1

      Well, with TCP window scaling you should be able to get reasonable throughput even with fairly high latency...

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
  28. Comcast this, Comcast that... by Guppy06 · · Score: 0

    What, has Comcast become the new SCO or Sony around here?

  29. Speeds by Sunar · · Score: 2, Informative

    If you are only getting 1.2Mb sustained on Comcast you have a problem. I can pull 6Mb steady for hours on end using Comcast. Like others have said though...Speed Boost will make tests show different numbers at times.

    ~Sun

    1. Re:Speeds by DA-MAN · · Score: 1

      How much you want to bet the "sysadmin" who wrote this submission ran the sustained speedtest from a server on a t1. . .

      --
      Can I get an eye poke?
      Dog House Forum
  30. If those clients are running Windows... by thejynxed · · Score: 3, Informative

    You just might want to check that their connections are properly tweaked as far as RWIN, MTU, etc go. 14/5 compared to 1.2/290 is a vast, vast difference that should never happen if they are paying for a certain tier of service, even if it is advertised as "up to" that higher rate. I'd also do a smoke ping and line quality tests, etc over at BroadbandReports, because there is something definitely not right with those connections if that is the average drop in performance. There may also be mis-configured firewalls, routers, mis-provisioned lines, water leaks, etc causing such issues.

    My advertised and provisioned rate via Atlantic Broadband cable is 5/512. I am actually getting closer to 6 or 7 down and 468 up at all times due to some tweaking I did. Even the AtlanticBB tech seemed a bit shocked that I was getting more than 5 down, and said it was unusual, but they wouldn't re-provision the line or anything because of it. I count myself lucky, because Verizon's service here is absolute rubbish - $25.00/month for 1.5/768 DSL that, shall I say in the politest way possible, isn't actually working for more than two weeks per month because they are too cheap to replace lines that were put up in this town sometime in the 1950's at the latest (Not to mention they never actually bother to show up for scheduled appointments to rewire buildings that were constructed pre-1900, such as mine - big old Victorian type home turned into apartments).

    Powerboost does mess with speed testing, however those "tests" are very rarely accurate anyhow, as I can rate higher on a test to Seattle or Los Angeles than I do to say Pittsburgh, Toronto or NYC, which are MUCH closer to where I live (by several thousand wire miles). It's more accurate to calculate your average rates by downloading/uploading large files from/to a university/public FTP or something, at least in my experience.

    --
    @Mindless Drivel: 100% of Twitter posts ever Tweeted.
  31. Speakeasy / Speetest.net by shamer · · Score: 1

    I was assuming they where in bed together, Comcast and the 2 top bandwidth speed testers that is. Though Speed boost makes just as much sense.

    Weather this is true or not, it's just a revisit to an older /. post http://ask.slashdot.org/article.pl?sid=07/07/08/2116214

    1. Re:Speakeasy / Speetest.net by Anonymous Coward · · Score: 0

      Do you mean "whether"?

      Weather is like rain, or snow...

  32. Charter does it too.. by keepr · · Score: 1

    Charter does this too.. It's standard practice lately for cable providers. It makes them look better and it helps out the end user by allowing them to "burst" small amounts of data (like websites). This is a function of traffic shaping, I dont see any harm in it. Just test your connection speed with real world application instead of these speedtest sites. You will get a lot better picture of how fast and "stable" your clients connection is if you download a 100mb file from an ftp site and then put it back up there. You will be able to see how much jitter they have in their connection and work out an average speed.

    --
    Slashdot taught me how to use the preview button!
  33. Note to ISPs by Bender+Unit+22 · · Score: 1

    Internet connections are not just for websurfing and emails anymore.

    Of course it depens on the user, the average traffic from my xbox 360 alone (in gaming, demo downloads, movies etc) in one day, is more than my parents have in a month with their just light surfing and email use. And I don't use my xbox that much.

    It is an issue they have to face now. Legal traffic alone these days for high tech households internet use, can pass your ISPs secret acceptable use limits.

  34. I do remote support, & COMCAST = F A S T!!! by Anonymous Coward · · Score: 0, Troll

    Daily, on the job professionally (fixing folks' computer woes via remote support) I see a lot of folks from various ISP/BSP's nationally in the U.S.A. (continental, & offshore like Canadians & Hawaiians)... & I get to "compare" the performances of each:

    COMCAST does rank up there with the fastest, IF NOT CONSISTENTLY the fastest overall!

    (Judging just by "feel" though, mind you (& it's the MOST important thing really), with myself as the remote desktop support person doing the job on client systems via WEBEX remotely).

    Whatever they're doing, imo & experience, they're doing it RIGHT!

    1. Re:I do remote support, & COMCAST = F A S T!!! by Mister+Whirly · · Score: 1, Informative

      Judging just by "feel" though,(& it's the MOST important thing really) I would have to guess you are a Comcast employee pimping your own company, albeit anonymously.

      --
      "But this one goes to 11!"
  35. No Powerboost for Me by jfade · · Score: 1

    None of the Comcast Lies and Propaganda about this so called "Powerboost" are true for me at all. In fact, last time I ran a speed test I only got 384 kbps up and something like 4-6 mbps down. Hardly an "improvement". In case you were wondering, no, I wasn't running any torrents at the time. In fact, I didn't have anything else going at the time so I have no idea why it was so slow.

    1. Re:No Powerboost for Me by budgenator · · Score: 1

      no, I wasn't running any torrents at the time.
      I take that to mean that you turned off the torrents and then tested, which means your connection was probably still in "Punitive Mode"; you need to shut down your cable modem for at least 30 second then reboot it with a fresh configuration, which gets you back into "Normal Mode" and a new IP address that is not viciously throttled by the sandvine policy routers at the head-end.

      --
      Apocalypse Cancelled, Sorry, No Ticket Refunds
    2. Re:No Powerboost for Me by jfade · · Score: 1

      No, I hadn't been running any up till that point that day and don't distinctly remember running any in the days preceding... I was getting ready to upload a file via FTP to my webhost and decided to test my speed for kicks and giggles before starting it, and the result was as I described. (A side point, my FTP upload speed seems somehow capped by them as well. It'll start fast and then can never reach speeds above 46 kbps or so. Truly annoying.)

  36. Just develope a system by LM741N · · Score: 1, Insightful

    that takes advantage of this by downloading in an on/off switch manner.

    1. Re:Just develope a system by prxp · · Score: 1

      just develop a system that takes advantage of this you mean like a distributed peer to peer network of users that would serve tiny parts of a larger file to each other, thus making the download session for each of this part fit the speed bust grace period and as a consequence would make the entire large file be downloaded with the increased bust speed? That's just Genius!
  37. QoS limits by Sniper98G · · Score: 2, Informative

    This is a result of "burst rate" which is an asignable property in QoS. The idea is to allow small files like web pages to load much quicker then large file transfers. Most ISP's are doing this now as a means to speed up web browsing. The best way to get an acurate speed mesurment for file transfers is to download a large file while using bandwidth monitoring software.

  38. How about an answer? by WhyMeWorry · · Score: 4, Informative

    I know that this is slashdot but I'll try to answer some of the OP's question anyway. Of course I won't do any original research myself, but rather rely on information from the previous posters or make things up as I go.

    Q1. Is there any valid reason why Comcast would front-load transfers in this way?

    Yes. Most requests from browsers are for short files. By upping the speed for short requests, pages will render faster. This is a plus for the user, as he spends less time idling. Long downloads on the other time are expected to take a while to complete; the user expects to be able to walk away from the computer for a while. Thus Comcast can argue that they have greatly enhanced the experience of the web browser by stealing a few cycles from the downloader. I would welcome such a plan as long as the ISO downloading speed is reasonable.

    Q2. Is it merely an effort to prevent end-users from being able to assess their bandwidth accurately?

    It would have that effect on a poorly designed bandwidth test. Bandwidth testers try to make the download size long enough to counteract tcp connection costs and to average over variations in download speed. Comcast has just given them another variable to take in to account. Interestingly, there are some test suites that are designed to detect what Comcast is doing and give them extra credit for it. They bill their tests as real world throughput tests. They want to indicate what the effective bandwidth is while browsing web pages that reference many images or javascript files.

    Q3. Is Comcast cheating?

    If Comcast is just doing this when accessing known test sites then they are cheating. If this is their policy for all connections then the worst that can be said is that they are optimizing their service to a particular class of users (surfers as opposed to downloaders). If you are in this category, then you should be happy.

    1. Re:How about an answer? by mobets · · Score: 1

      Something else that seems to affect it is the location of the speed limiter. On Comcast in Houston, I sustain nearly double my advertised bandwidth to any server in Houston or Dallas.

      --

      It was me, I did it, I moved your cheese
    2. Re:How about an answer? by WhyMeWorry · · Score: 1

      Good to hear for two reasons. It says that they are giving more than they promised. It also says that they are willing to give better service wherever their costs are lower. I wonder if their management know that this is happening.

  39. Frontloading by Galen+Wolffit · · Score: 1

    My made-up statistics show that the vast majority of users are downloading relatively small files. When you hit a web page, the browser downloads many small files. When you download anything via a P2P protocol, you're once again downloading very small files (that is, each peer sends you a small chunk of the file). Boosting bandwidth for the first few seconds of a connection can significantly improve the user experience without placing a constant drain on the network.

    Unless they advertise it, it's fraud, but it makes sense.

  40. I wish by smartin · · Score: 1

    I wish that Verizon did not block ports 25 and 80. I already have FIOSTV and would switch to their internet service in a heartbeat but I don't want to give up my web and mail servers.

    --
    The difference between Canada and the USA is that in Canada healthcare is a right and gun ownership is a privilege.
    1. Re:I wish by Ioldanach · · Score: 2, Informative

      I wish that Verizon did not block ports 25 and 80. I already have FIOSTV and would switch to their internet service in a heartbeat but I don't want to give up my web and mail servers.
      They'd be happy to unblock those for you, and give you a static ip, for $99.99 per month with a 2 year agreement.
    2. Re:I wish by Anonymous Coward · · Score: 0

      Ok, so let's say that I don't want to have a static IP, pay $100 per month, or sign a two year agreement in order to get them to stop crippling my service. What do I do now?

    3. Re:I wish by Ioldanach · · Score: 2, Insightful

      The equivalent 15/2 residential package is $52.99. I therefore presume that they consider the value of static IP, unblocking of ports, and no 'no servers' clause in the contract to be worth $47.00 per month. These things are bundled together, and if you don't want to pay the extra $47, no servers for you. In my opinion, they're charging way too much for the extra 'features' (which are really the removal of something actively added to cripple the service in the first place), but they are still offering them to you, just at a price. That's capitalism (combined with government sanctioned monopolies) for you.

    4. Re:I wish by Anonymous Coward · · Score: 0

      Get a business plan, cheapskate.

    5. Re:I wish by smartin · · Score: 1

      Right, I'm not the sort of person that would ever pay double for something like that. I'm not a business user I have a simple personal low volume website for friends and family. I could probably work around the port 80 restriction but I can't understand why they would block port 25 inbound? Outbound I can understand.

      --
      The difference between Canada and the USA is that in Canada healthcare is a right and gun ownership is a privilege.
    6. Re:I wish by Ioldanach · · Score: 1

      I had ports 25 and 80 inbound blocked on my last cable provider, as well. They have a "no servers" clause in the contract, so they block port 80 and port 25 under those grounds. It also helps to prevent open relays on their network, and since you're not allowed to run a server in the first place, they don't have any problem preventing all incoming traffic on the port. Again, I could have purchased a business plan for a similar premium.

  41. See link here by MECC · · Score: 2, Informative

    Comcast has been doing this for a while now.

    --
    "We are all geniuses when we dream"
    - E.M. Cioran
  42. Typical for shared bandwidth solutions by Anonymous Coward · · Score: 0

    This kind of prioritizing of the first X bytes of a connection or X seconds of traffic over a period of time is a typical way of boosting the user experience on networks which share the last mile bottleneck between clients. Advantages are similar to IP-header based traffic shaping, but without the user-end hassle or complex and changing priority tables.

    If a speed test is not suitable to measure this and the ISP company delivers what has been advertised, it's up to you get it right.

  43. PowerBoost uses a 30 second average, not filesize by ben+there... · · Score: 5, Informative

    Torrents do that anyway. That is the reason why comcast have to beat them on the head. Each segment in the download is small enough to fit its "booster" criteria. No, that's not right.

    PowerBoost only accelerates the connection if the average speed you've been getting over the past 30 seconds* is less than the speed you are rated at/paid for. So if you have a 6 Mbps connection, that's 768 KB/s max. PowerBoost will raise that to up to 2 MB/s for a little less than 15 seconds, making your average for the past 30 seconds equal to 768 KB/s. After that, no matter how many new connections you open, your connection stays at 768 KB/s. But if your connection gets interrupted/throttled for a few seconds, you may get another boost after it resumes, until you are back to 768 KB/s 30 second average again.

    *it may be slightly more/less than a 30 second average. Boosts seem to last about 10-15 seconds, which would make sense with that number.
  44. Iperf by MT628496 · · Score: 3, Informative

    Iperf, or something like it is what you should be using for speed tests. Set up the daemon on a machine that you know you need to access and tell it to send a ton of data a few times. See what the results are. Those speed tests test how quickly you can communicate with some random server that you'll never need to send any presentations or video files to in day to day business.

    1. Re:Iperf by clf8 · · Score: 1

      Honestly, how can you test the bandwidth of a connection without some sort of sustained test? That's like taking a scientific poll but only asking 2 people. To further the analogy, with Speedboost the 'informed' people are at the front of the line, so they're asked first. In addition, wouldn't you want to run this testing at various times in the day as well?

  45. Remove this story or comment at the bottom. by WindowLicker916 · · Score: 0, Redundant

    As EVERYONE has pointed out, this is an advertised feature so Comcast is not "cheating". Instead of people automatically assuming to Comcast bash I think it only proper of the Moderators to post at the end of the story that this article is inaccurate and is part of a service feature. Most people don't bother reading comments, so Slashdot is feeding false information. I read one users post...I can't believe their cable company makes them pay for powerboost when Comcast offers it free!

  46. It's true by soren100 · · Score: 4, Informative

    I can assure that they do absolutely do this, and it is really annoying.

    It's really bad on uploads -- I just ran a test and I got 300 KB/s for the first 5 megs, then it degrades 100 KB/second over the next few megs, so that by the time you have uploaded 14 megs you are getting close to 40 KB/S in upload speed, and the connection is so bad that the shared digital phone line does not have enough bandwidth to have a phone conversation. Stop the upload and start it up again, and you get 330 kb/second, with the same degradation curve.

    For downloads they do the same thing, but not so severely -- I downloaded a 67 meg file and it ran at about 750 KB initially, but then dropped to around 350-400 KB/S (according to the FTP app) about halfway through.

    So for anyone using the connection for smaller file sizes (like the speed tests) you seem to get "blazing" speeds -- I ran the test at a couple of the internet speed test sites and they both think that I have 12000-14000 kb/s download speed and 2700 kb/s upload speed.

    So if I didn't have any other way to measure it, I would think that I was getting way more than I paid for, rather than something that in reality is very pitiful.

    1. Re:It's true by Anonymous Coward · · Score: 1, Interesting

      I've never had such poor overall bandwidth utilization until I had to get Comcast (it's the only fast game in town where I am).

      The second--and I mean the absolute second--FIOS is available in my area, I'm taking a shit in a box, putting my Comcast cable modem in with it, and sending it back to Comcast: "I've put up with your guys' shit long enough--it's time you put up with some of mine".

    2. Re:It's true by ToasterMonkey · · Score: 1

      My Time Warner connection is the opposite, I get 60KB/s for maybe 30 seconds, then it zooms up to 400-600 KB/s whatever my limit is. It's like this for every single http transfer, I only notice it when the actual transfer speeds are reported by the software, not the average speed that's typical.

  47. Speedburst in networking by wyztix · · Score: 1

    I didn't read lots of replies so it may already been stated. What comcast is doing is simple network engeneering. Using a "burst" architeture allow to quickly send small files, at the detriments of long one. Why doing so? simple QoS. It's an easy way to create some degre of QoS without having to introduce more complex technologies. Just think about what are "small" vs "long" files: Small: multimedia using UDP (VoIP,streaming), Web Pages, text emails, instant messenger, most games. In fact mostly what people use their connection for. Long: Email attachments, file downloads, "torrents" Most people can wait for their downloads 2-3 minutes more, but you just can NOT wait a second for a multimedia paquet to arrive. So by doing a "burst" strategy, they give "priority" on small files which doesn't congest your network for long, while slowing the long files that congest everything for quite a time. It's about the same as cars vs buses. By giving more speed/priority to the cars vs the buses, you allow more vehicule to use your road over time. Even if the amount of data transmitted is lower, the amount of different data is higher.

  48. Can't be right by ultranova · · Score: 5, Funny

    That can't be right. From your description, it sounds like a genuinely good and beneficial to the user idea. Where's the catch ?

    --

    Forget magic. Any technology distinguishable from divine power is insufficiently advanced.

    1. Re:Can't be right by Tassach · · Score: 5, Funny
      Any actually benefit to the customer is purely coincidental and unintentional.

      That nice warm shower feels pretty good until you realize someone is pissing on you.

      --
      Why is it that the proponents of "one nation under God" are so eager to get rid of "liberty and justice for all"?
    2. Re:Can't be right by Anonymous Coward · · Score: 0

      Now you're talking! Wait, u-n-t-i-l doesn't spell "when"...

  49. Re:PowerBoost uses a 30 second average, not filesi by NeoTerra · · Score: 1

    Looks like you are getting your 6 Mbps...

    768 KB/s * 8 (bits per byte) = 6144, or 6 Mbps.

    Since your PowerBoost goes up to 2 MB/s, it would be as follows...

    2048 KB/s * 8 = 16384, or 16 Mbps.

  50. The LIES and DAMN LIES they are... by Anonymous Coward · · Score: 0

    I was poking through my network,
    and I am on comcast, and a lot of funny things happend.
    If was using TCP/IP for a traceRT, I was getting one route,
    and if I was using regular old UDP, I was getting another.
    Bandwidth tests are those same flakey numbers,
    Start fast and then crawl

    Looks like they are splitting ports at the heads, and
    routing diffrent port traffic and profiles in diffrent directions.
    If you try chasing routs for either Battle.net or p2p,
    you get the frealing run around, but at least,
    after a while Battle.net requests get rerounted to a faster net.
    but the P2p stuff always stays on rediculus routing tables.
    Theough 4 or 5 local, 6 or 7 regional...3 or 4 optical gateways before it leave comcasts net for good.

    I recently switched to openDNS, and noticed that, the DNS was a first slow, then was fast, and now its the DNS is always fast. They are really profiling everything, and optimizing everything. I want to get something like a multi-port EtherAPE and just profile the sh*t out if all the ports, and see how they respond through time.

    F*CK comcast, and the horse they rode in on. I would, as a business optimize for what ever the customer wants, they want to optimize for what ever would 'appear' to be fast, and screw all the rest. People are reporting problems with VIOP on comcast too!

  51. No they aren't cheating. by wolferz · · Score: 0

    Comcast began providing this feature where I live almost a year ago. Cable providers have always capped their clients. Each cable node often can provide 60 megabits at a time easily, though most end servers don't allow a sustained download at that speed. However If clients are left completely uncapped a hand full of users could possibly soak up all the available bandwidth. If you have even gotten stuck on a 10mbps network with some one who likes to play games or use p2p software you will have seen this in action. For that reason users are given a set limit on their individual downloads and uploads. About a year ago here Comcast began uncapping users for the first 30 seconds of any connection. The concept is that web browsing and streaming media will benefit from the burst of speed (up to 25 mbit in my area) while services that would be capped on the servers end any way (file transfers) will be mostly as they always have been. A best of both world scenario. With the increasing use of active media in web pages it makes sense that short lived connections that wouldn't really take away bandwidth from any one else should be allowed to download as quickly as possible. They aren't the only cable provider that has started doing this ether. Time Warner just told a friend of mine when he moved into a new apartment that they were offering the same thing.

  52. Ummmm, Learn More by nuintari · · Score: 0

    Of course, clients get nowhere near this performance in everyday usage.


    Of course not, high bandwidth does not mean that every connection you make will be fast, it is more about capacity. The fastest download you will get from any given host on the internet is determined by the slowest link between those two points. If you have a 10 mbit connection, but the file you want sits on a server behind a T1 line, you will receive that file at a maximum of 1.5 mbit, probably less, as congestion has to come into account as well.

    (This can be quite annoying when trying to determine whether a client needs to switch over to a T1 or if their current ISP will suffice.)


    1) You do realize that a T1 is a fairly slow connection by modern standards right? It caps out at a flat 1.5 mbit down/up, no burst (which I will come to in a second) If they are getting _anything_ over 1.5 mbit down, it is not in their interests to switch.

    2) you have heard of MRTG right, graph their asctual usage, see what they actually use/need.

    Upon further investigation, it appears that Comcast is delivering this bandwidth only for a few seconds after any new request and it is immediately throttled down.


    This is not some dark hidden secret of Comcast, this is called burstable bandwidth. Almost all last mile technology supports this, and most networks use it. It is great for sending that message with the big attachment, or downloading a decent sized file.

    Is there any valid reason why Comcast would front-load transfers in this way, or is it merely an effort to prevent end-users from being able to assess their bandwidth accurately?


    God you are paranoid. Burstable bandwidth also has the happy side effect of making sure that no one connection will saturate the link. Connections that take too long are slowed down, freeing up bandwidth on the customer's circuit so they still have nice and fast browsing. This is about improving the quality of service, you have put such a spin on it in your own head, you just cannot see it.

    Does anybody know of other ISPs using similar practices?


    Yes, mine, your precious speakeasy, time warner, verizon, sprint, earthlink, mom and pop ISP 1, mom and pop ISP 2, mom and pop ISP N. We all do this! It says very clearly in most ISP contracts what your actual service is is rated at. So much down sustained bandwidth, so much burstable for X number of seconds.
    --

    --Nuintari

    slashdot : where an opinion can be wrong.

    1. Re:Ummmm, Learn More by myz24 · · Score: 1

      I'm with this guy and I actually like the bursting I get. It allows me to download a file and still browse with reasonable speeds. This is normal behavior.

    2. Re:Ummmm, Learn More by Bert64 · · Score: 1

      A T1 may only be 1.5mb, but its 1.5mb both ways.
      Also you're far more likely to get other useful services with a T1 like multiple IPs, reverse DNS, an SLA offering guaranteed uptime, and the ability to use the full 1.5mb in both directions day in day out with no fear of disconnection, contention or shaping. Consumer ISPs will usually slow down (due to shaping or congestion) during busy periods, and they might terminate your connection if you use obscene levels of bandwidth. With a T1, you are paying for the 1.5mb dedicated to you, not shared with anyone else.

      --
      http://spamdecoy.net - free throwaway anonymous email - avoid spam!
    3. Re:Ummmm, Learn More by nuintari · · Score: 1

      Yes, you are correct on all points, my frustration is with the belief that a T1 is a lot of things it is not. Most people believe 100mbit Ethernet is slower than a T1, that it is somehow this amazingly fast ultimate god of connections. In today's market, a T1 is a slow, over priced relic of a by-gone era. For the same money, you could order an ethernet loop at 5mbit up and down. You get the guaranteed bandwidth, the reliability of a commercial circuit, the 100% balls to the wall control over how the bandwidth is shaped, all the stuff you just said, probably save a few bucks a month in the end, or at least break even.

      Unless you live in some backwater little berg, you should almost never be caught dead ordering a T1 loop. Modern technology can deliver more capacity and reliability, at a lower cost.

      --

      --Nuintari

      slashdot : where an opinion can be wrong.

  53. Network Admin? Baseline the network utilization! by quaero_notitia · · Score: 2, Informative
    I've heard this said before..."this can be quite annoying when trying to determine whether a client needs to switch over to a T1 or if their current ISP will suffice." It's a service that the ISP is providing on their network, learn to work with it. And this is a good reason why you should be trending the link utilization before making a recommendation.

    Unless there is an problem with the link that can be immediately identified at the time you tested, like a physical problem, then you should develop a baseline of the customers network utilization. Generally, a single download provides insufficient information to in order for to give the employer or customers a recommendation related to their link utilization. This is especially important when the upgrade costs money.

    Trending the link utilization is easy to do with free open source tools that will run on Linux, Windows, or a Mac. Or you can pay some $$ and buy software that will perform network utilization trending. Many protocol analyzers have this feature too. As a network administrator/engineer I expect that you can figure how how to tap the link or access the link devices network interface utilization, SNMP, RMON, or even NetFlow/sFlow information.

    This is easy to do, just setup an extra PC or laptop on the customers premise for a week, just lock it down logically and physically. Free tools that I regularly use are Ntop (http://www.ntop.org/news.html) and Cacti (http://www.cacti.net). I'm sure that someone on this list can recommend a dozen other solutions.

    These tools provide a graphical means to display the link utilization over time, providing greater information over a single download test, thus allowing you to make a more informed recommendation. And the graphics make nice additions to your reports! One scenario would be that the customer is seeing a slow down of their internet connectivity after lunch or late afternoon. Well, trending might reveal that indeed the network utilization peaks at these times when workers get back from lunch and just before they go home. And maybe it's only a few people hogging the bandwidth. On customer networks I've discovered P2P file sharing, large file downloads (movies and ISO's), and even infected computers used as repositories. The customer would have plenty of bandwidth if they just cleaned up that mess or better managed the limited resource with both technical or administrative (policy-based) controls.

    And if you have more time, then check out the list of even more network management tools at http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html or http://www.ubuntugeek.com/bandwidth-monitoring-tools-for-linux.html.

    HTH someone.

    --
    -- Wondering how long until the internet becomes fully corporatist, like television.
  54. Web browsing is the reason by AJH16 · · Score: 1

    This makes a lot of sense for trying to make slower cable more appealing to those who want to browse the web primarily. Web sites transfer a bunch and then wait for a while before sending anything else. With a system like this web surfing would be very fast, but doing any kind of downloads or uploads would be much slower. It is a good way to try to charge people more for torrent and high bandwidth usage traffic while offering their ideal market(web traffic) a cheaper option.

    --
    AJ Henderson
  55. Crumcast... by flajann · · Score: 1, Flamebait
    What can I say? Switch to Fios if you can!

    I've had my Fios Fibre-optic connection for over a year now, and unlike everything else I've had before -- including Crumcast -- Fios has been fast and trouble-free. I can sustain the 5Mb down and the 2Mb up without a hitch, and I've tested this with BitTorrent, of all things.

    It's so good, in fact, that it's been exposing problems with my Netgear Wireless Router RangeMax -- I don't think they'd figured on someone sustaining that kind of bandwidth. So it's time for me to upgrade!!!!!!

    If you don't have Fios in your area, SCREAM at Verizon. I mean, I've always despised Verizon up till they delivered on Fios. What a rare occasion for a large otherwise stuck-in-the-mud bureauractic company to -- finally -- get it right. And you can't beat the 5/2 service at $40 a month. I was paying twice that for Crumcast!!!!

    Fios TV is avaliable in some areas if you still find anything interesting to watch in that medium. For you lucky chums, you'll be able to nuke Crumcast entirely. No idea how good Fios TV is, since I threw out that particle accelerator long ago...

    1. Re:Crumcast... by KillerBob · · Score: 1

      Err... I'm getting 7/1 from my cable provider for $35 CAD/month. It's consistently fast, they don't throttle it, they didn't even yell at me that month I downloaded a 56GB torrent (nor did they charge me overage, even though I'm supposed to only be 40GB/month)....

      Depends on the market you're in. By European or Asian standards, even my connection is crap.

      --
      If you believe everything you read, you'd better not read. - Japanese proverb
    2. Re:Crumcast... by flajann · · Score: 2

      It has been a long painful thing watching the US slip behind the rest of the world tech-wise, education-wise, freedom-wise, etc.

  56. Earthlink Cheats with Latency too by goombah99 · · Score: 2, Interesting

    I've noticed that my earthlink connection gets good marks for speed on tests but the speed tests take many seconds to actually start. In deed all my pages seem to load with multiple seconds of latency then all at once. (no it's not the browser, I have multiple computers that I move between home and work so I can do test across different ISPs)

    I think what they are doing is giving me 1000KBs at periodic intervals or with a high latency such that my peak speed is high but my average speed is low. My latency for 600 miles connections is a good fraction of a second. Pages that have lots of element load hideously slowly compared to pages with a big download, presumably because I'm paying this huge latency penalty multiple times.

    --
    Some drink at the fountain of knowledge. Others just gargle.
    1. Re:Earthlink Cheats with Latency too by paulatz · · Score: 1

      It looks like you DNS servers suck.

      --
      this post contain no useful information, no need to mod it down
    2. Re:Earthlink Cheats with Latency too by psydeshow · · Score: 1

      I remember seeing this on Earthlink DSL years ago. I always thought it was some bug in their sketchy connection software, but if that's still the observed behavior then I guess it's just a bandwidth sharing policy.

      Sure is fun to click-click-click, wait a few seconds.... ah, there they go!

    3. Re:Earthlink Cheats with Latency too by palegray.net · · Score: 3, Informative

      He could always try using OpenDNS as a test to see if his ISP's DNS service is the issue:

      208.67.222.222
      208.67.220.220

    4. Re:Earthlink Cheats with Latency too by gluis · · Score: 1

      hey palegray, thanks for posting those dns servers. i was about to comment that i've had the same experience as the earthlink guy, and just today i thought--after running a speed test--that it must be DNS. and then you go ahead and post these IPs! i replaced the BS earthlink ones (an old job had earthlink as a backup and i noticed their dns sucked then, too), and *bam*: success.

    5. Re:Earthlink Cheats with Latency too by palegray.net · · Score: 1

      No problem, glad I could help :).

    6. Re:Earthlink Cheats with Latency too by NateTech · · Score: 1

      So if everyone switches to OpenDNS, then eventually their service will suck too... how are they planning on handling this growth for free?

      --
      +++OK ATH
    7. Re:Earthlink Cheats with Latency too by palegray.net · · Score: 1

      How OpenDNS makes money. Their service has scaled quite nicely since inception, and there's no reason to believe they'll experience load issues in the future.

    8. Re:Earthlink Cheats with Latency too by Anonymous Coward · · Score: 0

      In deed all my pages

      "Indeed,".

  57. Consumer-grade Shared bandwidth by redelm · · Score: 4, Informative
    What part of "shared bandwidth" do you not understand? It boosts peak (short-term) rates by using other' users idle capacity. This has been done for 10+ years and is a feature of consumer-grade links that helps keep their costs down.

    If you want a commercial-grade link you expect to saturate, pay for it! Otherwise, you are stealing from other users and the ISP should throttle you to be fair to them.

    1. Re:Consumer-grade Shared bandwidth by JCSoRocks · · Score: 2, Informative

      I *have* a commercial grade link and I'm *still* getting throttled. It wasn't too much of a problem until this last month or so. Steam updates get dropped. VPN connections take forever. Netflix movie downloads that used to be fast are a joke now (from nearly instant to 10 minutes, ugh). It's infuriating. Nearly everything I do everyday requires a fast Internet connection and even though I'm paying specifically for one, I'm not getting it. :-/

      --
      You are using English. Please learn the difference between loose and lose; they're, there, and their; your and you're.
    2. Re:Consumer-grade Shared bandwidth by redelm · · Score: 1

      You have a valid complaint and need to press it. Some ISPs mislabel product.

    3. Re:Consumer-grade Shared bandwidth by Anonymous Coward · · Score: 0

      You are not stealing any more than going to an all you can eat buffet and being fat is "stealing" fact is that these companies are advertising something entirely different by stating speeds that they cant reliably provide. The assumption is that everyone wont use their bandwidth all the time and so they can over sell the line. That underlying assumption is no longer valid. More and more users are beginning to saturate their lines and that is why we are in a bandwidth crunch, the fact of the matter is they can no longer live up the reasonable expectation of reliable, consistent speeds for a large minority of their customers. A big argument is that all these big downloaders must be doing something wrong (read: illegal) in order to need that capacity residentially. That assumption is also false, there are tons of free 2 to 6 hour independent movies to download and watch. Various software installs alone can be hundreds of MB's especially for updating games. not to mention free software suites gimp, linux distros, etc. On top of all of that new paid video content pops up all the time. The excuse of fighting piracy just doesn't hold up when some series Itunes sales are even higher than dvd versions. They put up a sign for all you could eat, a bunch of hungry people came to the diner and they didn't order enough food, now who's fault is that?

    4. Re:Consumer-grade Shared bandwidth by SuiteSisterMary · · Score: 1

      If your Internet connection contains the words 'cable' or 'DSL' anywhere, you likely don't have a 'commercial grade' connection, even if you're paying more than residental rates.

      'Commercial grade' in this context means a T1, T3, or other such connection. If you're paying for a T1, and you're not getting 1.544 mb/s, you've either signed something you shouldn't have, or you should be re-reading the 'penalties' part of your contract.

      --
      Vintage computer games and RPG books available. Email me if you're interested.
    5. Re:Consumer-grade Shared bandwidth by rastoboy29 · · Score: 1

      Meanwhile, back in reality, consumers--customers--expect to get what they were promised and paid for.

      "Stealing from other users" indeed.  What a dumb notion.

    6. Re:Consumer-grade Shared bandwidth by redelm · · Score: 1
      Yes, "stealing from other users". Their internet will slow to a crawl. You have used the bandwidth the ISP had provided for their use. To stop this, they throttle you.

      As for "promised and paid-for", what _exactly_ were you promised? Continuous internet access at speeds up to X. And that is exactly what you get. Speeds up to X (wehere technically feasible) for a second or two to burst pages in. The "faster internet experience" advertised. They never promised you continuous speeds of X.

      Maybe you don't like it, but how can you expect to argue successfully if you cannot see the other side clearly? Perhaps you think it's all about profit, and will get blindsided and shutdown by the fairness argument.

    7. Re:Consumer-grade Shared bandwidth by Anonymous Coward · · Score: 0

      C, res customer, S, sales:

      C: I'd like the 5 mbit internet you advertise
      S: Certainly, that's $39.95 a month
      C: Very nice, and that is unlimited usage and access?
      S: Absolutely. You may access the internet as long as you would like. You may download anything you like. We do not have caps, however, we discourage abusive usage.
      C: Hmmm. Okay, so it's sort of unlimited then?
      S: Well, it is unlimited. However, if you were to attempt to saturate your connection 24/7, our network admins would terminate your service.
      C: Okay, so at what point do you consider the usage abuse?
      S: I'm not at liberty to say.
      C: So you know?
      S: I can't discuss that.
      C: Okay, well, I can at least always get 5 mbits, assuming the other side of the connection has the bandwidth, right?
      S: Well, uhhh, we can't guarantee that. It's up to 5 mbits.
      C: Oh, another limitation. Maybe you can define the up to? What speed am I guaranteed to get?
      (what sales would like to say)
      S: I can only define this about our $39.95 service: You really don't want to know how low we can go. For speed or usage. We have a 100 mbit pipe and 50,000 customers. Do the math. You'd probably do better with a UUCP connection.
      (what they really say)
      S: Well, it's pretty good. We don't get many complaints. You're welcome to try the service for 90 days and see if it suits you! After 90 days promotional period, let us know if you want to keep the service. (What they'd add if they were honest: After the 90 days the price doubles). If you'd like, you can take advantage of our tv and phone bundle offer for only $10 more during this 90 day period!

      This is pretty much average. With misleading statements and advertising like this being common, how can you accuse ANYONE of stealing?

  58. This has been going on for a while though by Anonymous Coward · · Score: 0

    Since before Comcast's speed boost option I've been seeing articles about this. Comcast has several of the speed test sites flagged and will provide superior connections to them.

    When we first got Comcast the speed tests were showing roughly 5 times the speed we were getting anywhere else, and we were only really getting around the advertised speed of our connection on the speed test sites. This was a few years before I first saw any advertising for their "PowerBoost" or whatever they're calling it, and it's an option we never signed up for or paid for while we were still stuck with Comcast.

    The speed boosting could be related to this, but it's not likely that it's the only part of this situation.

  59. The good news. by Tiger+Smile · · Score: 1


    How can we trigger this effect all the time?

    --
    -- Prepared at the direction of, or to be sent to Legal Counsel, in anticipation of litigation. Attorney Client Pri
    1. Re:The good news. by L4t3r4lu5 · · Score: 0

      I dont work for an ISP, nor do I pretend to have any in-depth knowledge of this technology, but to me it would seem that to make constant use of this boost you'd need to burst the downloads from a resume-supporting host, pausing the download until the specified reset time for the boost feature. You may need to even use some form of proxy-shifter to break any logging of connections.

      I'm not sure how effective this would be unless you get a significant boost to download speed (8Mbps to 512kbps), and the reset time is lower than the equivalent download time at the lower speed for the same file size. Plus, remember you're only as fast as the lowest speed in the connection. If the proxy only gives you 2Mbps, you're probably better off just using something like FlashGet to consume your bandwidth.

      --
      Finally had enough. Come see us over at https://soylentnews.org/
  60. Works as expected, nothing nefarious going on. by LarsG · · Score: 1

    any time I run any type of bandwidth testing for clients with Comcast accounts, the results have been amazingly fast

    If you want to test sustained speed, then test sustained speed. When you benchmark a HD, do you only test reading small files (which will fit in the HD's cache ram) and then get surprised when the sustained speed is significantly lower? Use the right benchmarking tool, mmkay?

    it appears that Comcast is delivering this bandwidth only for a few seconds after any new request and it is immediately throttled down.

    And in many situations, especially with consumer links, that's a good thing. Joe User's usage is often bursty (loading a web-page, fetching an email, etc) so designing the network to give good initial burst speed makes perfect sense since it makes interactive usage a lot more responsive.

    Is there any valid reason why Comcast would front-load transfers in this way

    Better performance for interactive / short-burst content. Which is exactly what many users want.

    or is it merely an effort to prevent end-users from being able to assess their bandwidth accurately?

    Is it the ISPs fault that you use the wrong tool to benchmark the connection? If you want to know sustained rate, don't use small transfers. One has exactly the same issue with benchmarking HDs or flash-memory, burst and sustained are not the same.

    If you can show that Comcast has engineered their network to give priority to traffic from popular network speed test sites, then you'd have a legitimate issue. But from your description it sounds like this is just interactive burst, which is perfectly legitimate and in most situations a good thing.

    --
    If J.K.R wrote Windows: Puteulanus fenestra mortalis!
  61. who needs boost by Anonymous Coward · · Score: 0

    who the hell need a 15s boost to 15mbit and have his line at 1.2mbit..
    when in other countries you just get the line to 10-20mbit and get over it..

    I have adsl2+ with 20mbit maximum ip speed for $25/month, no "boost" shit there.
    i'm at 2.7kilometer from the central so my average real world download speed is 1mbyte per sec (1024k/s)
    upload being 1mbit/s aka 128k/s all the time.

    oh, i get also ip tv for free, radio over ip for free, telephone over ip for free (and free to most countries in the whole world), voip from my cellphone through my ISP to the same destinations *for free*, ipv4, ipv6 tunnels, newgroup mirrors, most linux distributions mirrored by the ISP (so getting my 1mbyte/s on iso downloads most of the time).. ok this is redudant and every country knows this ISP by now i guess ^^

  62. Re:Romani by onkelonkel · · Score: 1

    Screw the Romani. They should have stayed on their side of the neutral zone.

    --
    None of them can see the clouds; The polished wings don't care.
  63. If you haven't read it already in earlier posts... by socialhack · · Score: 1

    ... This is a so-called "feature" marketed as "Power Boost", "Speed Boost" or "Quickie". Apparently, the expected behavior of this feature is to increase the connection speed of the first few seconds of a download then drop it down to a lower speed. If you want to learn more, there are a few earlier posts that explain this in more detail and dozens that explain it in less detail. Remember - It's only funny the third time.

    --
    Never leave a dead horse unbeaten!
  64. Speedtests and Usage by natbet · · Score: 1

    If you are comparing the speakeasy speedtest to your transfer of the 100MB file the numbers will be different. Speakeasy tests return the results in bits/sec, when you transfer a file the rate is displayed in bytes/sec. So, 15Megabits/sec ~ 1.8Megabytes/sec and 4Megabits/sec ~ .5Megabytes/sec see, both tests were accurate, just displayed in a different format.

  65. Bursting software by jamesshuang · · Score: 1

    So... what exactly stops you from writing some sort of a program that will throttle your network to download 5 mb, wait a second, download another 5 mb, and continue? Your overall average speed will be much higher. It really depends on the "falloff" rate, how quickly you can download again, at the full speed.

  66. SpeedBoost? "Burst" back. by Culture20 · · Score: 1

    If they slow you down after the first 20 seconds into a 700MB iso download, might I suggest:
    false; while [ $? != 0 ] ; do wget -c http://ubuntu.com/foo.iso & ; export X=$! ; sleep 20 ; except kill -9 $X ; done

    This runs wget in continuation, sets the PID of wget to X, sleeps for 20 seconds, kills wget, and finally quits when wget isn't around any more. Possible problem: if something else gets wget's old PID during the sleep period (after wget finishes normally), kill -9 will kill it, and run through the loop once more.
    My ISP was throttling after 5 seconds, preventing me from doing OS updates, so until they fixed their policy, I had to do something similar.

  67. USERS CHEAT THEMSELVES cause they don't research by electrictroy · · Score: 0

    >>>>> Broadband, like dialup, is subsidized by the low use casual customers.

    >>> In other words the casual user is paying too much.

    Well...

    People can still get $7.00 a month Netscape dialup accounts (unlimited usage). This is what I have for travel, and it works just fine for web-browsing. The problem is that many customers (like grandma) are convinced by Comcast/Verizon/et cetera that they MUST have high-speed internet, so these customers spend $20 or $40 a month for speeds they don't need.

    Conclusion:

    Per usual, it comes down to the casual, low-usage customer cheating him or herself. If they were wise, they'd get a cheap $7 dialup connection but because they didn't do their research, they end-up paying far far more than they need to pay.

    --
    The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
  68. Scales to business class too by LoudMusic · · Score: 1

    I've been watching this on my company's business cable for a while too. We pay for 6 (maybe 8) mbit Comcast but when I run speed tests I see as much as 24mbit. I also watch the connections on my firewall and Window's Performance Monitor. Why the topic poster thought this was a "speed test defeater" is beyond me. It's obviously a burst feature.

    --
    No sig for you. YOU GET NO SIG!
  69. It messes up Netflix Watch Instantly by ukemike · · Score: 2, Interesting

    This would explain why Netflix's Watch Instantly feature always stops after a few minutes and has to re-buffer with the message "your internet connection has slowed." It's really irritating. It's been doing ever since Comcast dropped my monthly rate and told me they were signing me up for "faster" service. !@#$%@#$^%

    --
    -- QED
  70. The only way to really know is, by budgenator · · Score: 1

    The only way to really know is, to install a linux box as a gateway between the users and the ISP and do some serious traffic logging and analysis. This way you can build a profile of how the users are Really loading the system and how the responds. Switching a customer from a low duty cycle ISP that provides bursts of 16 Mb/S to a high duty cycle T1 line that provide 1.54 Mb/S, is a serious endeavor especially considering that the cable modem provides 10 times the bandwidth for 1/6th the price, you need all your duck in a row to make a business case for that.

    I'd consider using the Cable for downloads, and bonding a sDSL line or two together for uploads, 1 cable + 2 DSL's is going to run you about $110.00 /mo a T1 is about $300.00 a month.

    --
    Apocalypse Cancelled, Sorry, No Ticket Refunds
  71. Comcast Traffic Management by ndguy · · Score: 1

    It's a common practice in networking to allow burst of data at a higher rate than can be sustained for a long period. Years ago frame relay had the concept of a Committed Information Rate and a Burst Size. The customer was promised the full CIR for the long term but could burst several hundred megabytes at wire rate. Today bursting is commonly controlled with a leaky bucket algorithm where a steady flow of tokens represents the allowable steady state rate but you can burst really fast until the bucket empties. The benefit of this approach is that it speeds up interactive traffic compared to long file transfers. If it takes more than a coffee break for something to happen, then taking a little longer won't hurt, but it's really painful when interactive applications slow down. If I had a choice between making speeding up one person's multi-gigabyte movie file transfer or speeding up everyone's interactive work, I'd rather speed up the interactive. Of course, I'd rather have instant everything for zero cost and a million dollar a month salary, but I can't figure out how to get that.

  72. They are doing this for a reason by Anonymous Coward · · Score: 0

    They are doing this for a reason it will make web pages load faster, so perceived speed where users notice it most is better, this is the same thing that any QOS system will do, you have 2 caps, a 'sustained' and a hard cap, so for a brief time you can get much higher speeds.

    This works very well with most http traffic since usually you're loading a web page, so you're doing 20 - 30 =100kb transfers, so letting them happen at 4MB/s will make your internet feel fast, but it would probably be cost prohibitive for them to offer this for sustained transfers/connections.

    You will probably find that bursty traffic tends to get 4MB/s for every burst.

  73. Re:USERS CHEAT THEMSELVES cause they don't researc by Anonymous Coward · · Score: 0

    If they were wise, they'd get a cheap $7 dialup connection but because they didn't do their research, they end-up paying far far more than they need to pay.

    You have dialup connections that don't take a phone line costing $10+ a month? Oh wait, that's right, you expect the grandmas to use their psychic powers to not check their email or search for recipes when someone's trying to call.

    The other services are about more than just speed.

  74. Well this article was Enlightening in one aspect by electrictroy · · Score: 0

    >>>"Doing a download and upload test using a significantly large file (100+ MB) yields results more in line with everyday usage experience, usually about 1.2 Mbps down"

    Now I know my 1.0 Mbps DSL line is not really any slower than a Comcast cable line. But it a heck of a lot cheaper ($15 a month versus $45 a month). Glad I saved my money. :-)

    --
    The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
  75. It's called "Power Boost" by Doug52392 · · Score: 1

    I have Comcast (unfortunately), and I have noticed that same thing. Whenever I download a large file, like a 700mb Linux ISO image, I will get a super fast download rate for 5 seconds, then it will go down.

    I think Comcast uses this to cheat and say "our internet is the fastest ever!". A lot of good it's doing them.

    I just heard Verizon DSL is coming to my city in the next 2 months (after I called them up and asked them NOT to send Verizon FiOS ads to me because we can't even get it). The SECOND Verizon is available I am canceling Comcast and getting Verizon

  76. Re:USERS CHEAT THEMSELVES cause they don't researc by Bert64 · · Score: 1

    The trouble is modern bloated graphics/flash laden websites, that would load pathetically slowly on dialup...
    Because many people think they need broadband, many people get it, resulting in website authors thinking everyone has it. Hopefully the prevalence of mobiles with limited browsers and slow connections will help webmasters see the error of their ways.

    --
    http://spamdecoy.net - free throwaway anonymous email - avoid spam!
  77. Gold Star Quality by Anonymous Coward · · Score: 0

    That's someone's idea of Quality of Service. And generally it works. We have this kind of thing in our office. The only annoying this is if I'm here at 9pm downloading an ISO and I look around and no one else is here, why do I still get throttled down after a few seconds?

    We're not on Comcast, or anything like it; but we apparently have a couple of stages, unfettered 5 sec window, followed by a decent 2 minute window, followed by a bearable 30 minute window. Then it just starts to get mean; I try to resume my downloads after this point.

  78. Re:SpeedBoost? "Burst" back. by Culture20 · · Score: 1

    forgot to mention: write a little script named except that reverses the exit code (non-zero to zero, zero to one) for the kill portion. There's apparently a binary on some *nix system somewhere that does that, but I always use a shell script.

  79. Shortest Job First by natoochtoniket · · Score: 4, Informative

    In operating system theory, it is well known that a scheduling algorithm called "Shortest Job First" yields the least total waiting time. The SJF algorithm is usually implemented by giving a "new" job high priority, and then reducing the priority gradually as the job accumulates resource usage. The algorithm was developed in the 1960's to allow time-sharing operating systems to provide rapid keystroke response, while continuing to process large batch jobs in the background.

    For communication systems, the same principle applies. The only difference is that the network is sharing a different resource (circuit bandwidth), instead of cpu time. The "new" connection gets high priority, and then that priority is reduced as the number of bytes/packets transferred over that connection increases. This allows rapid response for interactive applications, like browsing or editing, while also allowing the network to process large data transfers in the background. To apply it to datagram traffic, the switch just keeps a priority for each source/destination address-pair in cache, and any pair that is not in the cache is regarded as "new".

    This has been pretty much standard practice in packet communication switching for a very long time. There is no surprise here, at least not to those of us who have not been doing communications network programming for a few decades.

    1. Re:Shortest Job First by Anonymous Coward · · Score: 0

      Nonsense. Absent any QoS or Queuing configuration; router/switch interfaces operate as FIFO.

    2. Re:Shortest Job First by ILongForDarkness · · Score: 1

      There is no surprise here, at least not to those of us who have not been doing communications network programming for a few decades. Which must be something like 80% of slashdotters ;)
    3. Re:Shortest Job First by Anonymous Coward · · Score: 0

      This sounds like an answer to the video chat issue I've been playing the run around game with Comcast Support on - does that sound familiar to anyone else here? There was a time in the past when I could video chat just fine (for any length of time) from my work place to my home (where I have Comcast - it's the only choice available in my neck of the woods) - but for about the past year, when I start a video chat session it works fine for about the first 45 to 60 seconds then the video starts to hang and go choppy as seen from my work site (so the upload feed from home). Comcast has made me jump through an amazing number of hoops on my end - they really want to blame any home networking I've done rather then their connection - but now I wonder if I'm not just experiencing a side (or direct) affect of what is being described here.

  80. Re:USERS CHEAT THEMSELVES cause they don't researc by electrictroy · · Score: 0

    Dear Anonymous Coward:

    You may have heard of the V.92 standard. It allows grandma's modem to intercept a call-waiting signal, temporarily suspend her web-browsing, and answer the phone to talk to her friends. Thus:

    - You don't need a second line to use dialup.
    - $7 dialup is still a cheaper option than $20 or $40 for high-speed internet.
    - The previous poster was correct when he said, "The casual user is paying too much."

    --
    The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
  81. SDV by PhillyMeeks · · Score: 1

    It makes me wonder... If one of the reasons Comcast is moving to switched digital video is to free up bandwidth, when they finally roll it out will we actually reap the rewards?

    --
    "Women. Can't live with 'em. Pass the beer nuts." -Norm
  82. It's a feature and it works well by Billnvd65 · · Score: 1

    I have had comcast for quite some time now. They introduced "speedboost" initially on the top tier plan but have extended it to the lower plans as well. It operates as a token bucket throttle, it may in fact be a token bucket, but I do not know how they are accomplishing it. So you start with a bucket of tokens, you are allowed to expend the tokens as fast as you can up to about 24Mbps, once the bucket is empty you are out of BW. The bucket refills at a rate equal to your plan rate.

    I run similar filters in the linux firewalls I set up for clients as well as general BW throttle and fairness queuing. Anyone interested in this stuff for their home/bus network should look at the tc filters available in any linux kernel.

    Anyway, people can bash comcast all they want about various crap they pull, but this particular feature works very well for normal user type connections. Very high initial burst rates allowing the first 10-20 MB to come in very fast then the throttle kicks in. Great for browsing and smallish downloads.

  83. Re:USERS CHEAT THEMSELVES cause they don't researc by electrictroy · · Score: 0

    Well that's something else Dialup providers have improved. "Graphic compression". My Netscape service can take a bloated 200 kilobyte image and smash it down to 20 kilobytes. It may not look great, but I have observed many cases where the Dialup service actually loaded faster than my DSL (which does not compress anything).

    I do agree with you that it's ridiculous how many webpages have bloated.

    The worst offender is IMDb.com with its annoying flash-based ads. Grrr. Why is it necessary for me to download a movie just to view a pop-up ad? Have they not have heard of animated GIFs? Or "If you want to see a preview, click here"??? Users should be given the OPTION to load the flash movies, not forcefeed them down the pipe without our permission.

    Speaking in general, someone needs to take these web designers and show them tools like "GIFwizard" or "Photoshop" and how to use them to reduce colors to create smaller files. Displaying uncompressed or barely-compressed images on a website is truly poor design.

    --
    The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
  84. There are two sides to every Connection/Story by bru_master · · Score: 1

    I have a ten meg connection at my house but I download files from a server that has a 1.5 MBPS T1. The server I download from or upload to may have 15-30 others doing the same thing. I have no idea if Cox Cable is keeping me from my 10 megs because I have a Ferrari that I am driving on a one lane road behind a street sweeper. The internet industry has based its model around T1's so what can we do other than boast we have a high speed connection and hope the others have it too. What are the chances the network path chosen by the routers are all large pipes.

    When it comes to testing my connection, who is to say that my ISP does not have a high Quality Of Service applied to the most popular bandwidth testing sites, that would be good for business if QOS was enabled for those test sites.

    By the way,,, I have my entire house wired with CAT6, gigabit switches and gigabit NIC cards so I can pummel the crap out of my 10 MBPS Cable modem, I am thinking about changing to fiber, your thoughts!!

  85. Re:PowerBoost uses a 30 second average, not filesi by arodland · · Score: 4, Interesting

    Yeah, I did some testing on my own a while back and my theory is that it's a token-bucket sort of thing, implemented in the modem. Whenever your aggregate bandwidth is less than X for more than a certain amount of time, it allocates a "token" and resets your cap to 2*rated. The longer your connection is non-busy, the more tokens you get, up to a certain point (when the bucket is full). Then, when you start moving some data, and you go over your rated limit (which, after all, is half of what the modem is giving you), it starts taking tokens out of the bucket. When the bucket is empty, it re-caps you at your rated speed, and no more boost until you start collecting tokens again, which means a period of inactivity.

    And yes, as the other commenter pointed out, this is actually an entirely sensible way to deal with "bursty" internet use and improve user experience without actually buying any more bandwidth. It would be really sweet if Comcast didn't do other stupid shit ;)

  86. New Wave by klhrevolutionist · · Score: 1

    I believe new wave communications is also doing this.http://www.newwavecom.com/ Wondering if speakeasy would be better or not. A little more extra dollar but what is the value comparison ?

  87. That is how cable works. by r00t · · Score: 1

    Cable allocates TV channels for data.

    You can be allocated a whole channel to yourself, or just timeslots on a shared channel.

    Channels are allocated on demand. If you don't use your channel, it is given to some other user. When you start to need it again, a channel is given to you. There is some latency in granting a channel, and some latency in waiting for a timeslot on a shared channel.

    As long as you have a dedicated channel, your connection is fast and low-latency.

    1. Re:That is how cable works. by NevermindPhreak · · Score: 2, Informative

      most cable modems use just one frequency in an entire cable system -- commonly 555 mHz. though they can range on multiple frequencies, most cable systems aren't set up this way. besides that, once your cable modem locks to a frequency, it stays there.

      you have the right idea, though. everyone (on your node) shares that frequency. each cable modem a bandwidth limit. (it stores this limit in a file it downloads from the cable company. people change this file to get around the limit. if you've ever heard of "unlocking your modem", well, that's why it's possible.) they carve out their little slice of bandwidth when they need to use it, similar to what clients used to do in the old Bus Network setup. ( http://en.wikipedia.org/wiki/Bus_network ) this is also why it is technically possible to see all your neighbors traffic on a cable modem, though the traffic should be encrypted.

      cable providers assume not everyone will use their bandwidth at once, which is why they can oversell the available bandwidth. some cable providers (coughcomcastcough) do so at too high of a degree, and you get slowdowns during peak times.

      anyways, there is very little latency in getting your "slice of the frequency pie", so to speak. more likely, the GP's DNS servers suck. most ISPs would throttle connections in the exact opposite manor, trying to make normal web-browsing seem lightning quick but huge downloads given less priority.

      by the way, i work for a fairly decent ISP, and have a pretty good understanding of our cable setup. ;) this information will be somewhat false for anyone running DOCSIS 3.0, for what it's worth. DOCSIS 3.0 bonds together multiple channels, but it isn't very common.

    2. Re:That is how cable works. by r00t · · Score: 1

      The above is what I remember from reading the DOCSIS standard.

      It probably was version 3. There was the suggestion that numerous channels would be in use for each purpose: shared download, shared upload, unshared upload. There was the suggestion that unshared upload channels would be allocated according to some vendor-specific policy, generally according to some idea of demand and/or fairness.

      A provider could of course choose to make the upload channels be 100% shared or 100% not.

      I guess one could also do an unshared download channel, but that doesn't make very much sense.

      I think there was also a distinct channel for doing the allocations of channels and time slots, and maybe another for unknown modems to register.

  88. This is not a new thing (throughput vs. bandwidth) by Sedennial · · Score: 3, Informative

    This is not at all uncommon. Having worked as a network engineer for an ISP for 7 years just prior to my current job, I can tell you that this is common practice, especially if they are using any ATM. One of the reasons is that most session based transactions (web pages, email downloads, etc) are over in a few seconds. It actually provides better throughput and congestion control for the entire network to allow the initial transaction to burst at a higher speed, since a huge portion of those transactions are over very quickly.

    Think of the connection as a large pipe (your cable connection) with a small outflow valve (your modem), connected to a larger, higher pressure pipe (your ISP). Until your local pipe is full, you can put water into it as fast as you desire. But once it is full, the volume slows down because you can only put in as much as you are taking out (your cable modem connection/outflow valve). So what speakeasy and various other speed testing sites see is the effect of filling up your local pipe (your connection to your ISP).

    What a large file download shows you is the actual throughput.

    BTW, this is also a quick, very simplified explanation of bandwidth (how much data you can pack into the pipe) vs. throughput (how fast you can actually pull data through the pipe). :)

  89. Haven't read the comments, but... by TwoScoopsOfPig · · Score: 1

    Comcast calls it PowerBoost - basically, it's a marketing tactic. It starts at 15mbps down and throttles back after about 15 seconds or so on the assumption that most users only download ~10mb at a time for a "large" download. They actually call it a feature and use it in their advertising (targeted at idiots and users who don't know better).

    --
    #include <disclaimer.h>
    #include <beer.h>
  90. Corpsoratist and Polliticians are morality twins. by OldHawk777 · · Score: 0, Troll

    CorpUSoratist and Polltiticians (spelling intentional) are morality twins.

    Why tell the truth, when a lie is far more self-serving and profitable.

    Morality for most of both perverts is always identical: (1) to the victor go the spoils, and (2) forget the dead-beat losers.

    Gods must love CorpUSoratist and Polltiticians, because they ain't accountable or responsible for anything more than a blowjob, hubris, and demagogic legacy mythology (Stalin, Mao, Caesar, Napoleon, JFK, Reagan ...). Humanity, their culture/art/science, nation collective has a legacy and destiny; However, individuals, families, and friends have a past, but never a future beyond the grave, even when they believe they are immortal gods, or historical immortal rulers of hysterical immorality.

    --
    Unaccountable leaders are masters, and unrepresented people are slaves. How do US and EU fare?
  91. Airwave Networks as Well by knapper_tech · · Score: 1

    Airwave hosts small networks at residential complexes (apartments, condos, etc). They have very similar behavior to what you're describing about Comcast. Downloads will go very fast unless they go on for an extended period. Browsing and other small traffic is incredibly fast.

    Although the feature is very handy so that browsing traffic and other light average bandwidth applications get high speed, I also noticed I can do speed tests up to about 760kbps down and 200kbps up. Never in the last six months of using this connection for any application whatsoever have I observed speeds that fast to any server at any time for any duration. This includes transferring files to a server on campus nearby. Not for the first second even. To test to see if they were simply allowing speed test traffic to be un-throttled, I left a download going for an extended time (as usual speed decayed over time to a minimum of about 15kbps) and then opened a speed test. >1MBps up 200kbps down. My conclusion from repeating this several times is that Airwave is in fact giving bias to speed test sites in order to distort users' perceptions of their connection capabilities. Airwave isn't a large operation, but it goes to show that this kind of behavior is happening.

    I should mention that Sprint is the ISP who hosts the T1 line(s) connecting our network in the complex to the internet.

    --
    "There are some people that if they don't know, you can't tell them." ~ Louis Armstrong
  92. Get rid of kdawson by massysett · · Score: 2

    After reading and commenting on Slashdot for some time, I stopped reading it months ago due to dumb stories like this. I only came over here because Broadband Reports was making fun of Slashdot:

    http://www.dslreports.com/shownews/Slashdot-Keeps-Rediscovering-Comcast-Powerboost-91976

    kdawson continually posts garbage like this. s/he clearly has no clue. Get rid of kdawson and maybe I'll come back here.

  93. I don't think they are cheating by cecom · · Score: 1

    I know it is popular to bash Comcast these days, but I am a Comcast subscriber and I regularly get about 1 MB/s download speed, when downloading actual stuff, not benchmarks. One recent example was the Sun Java SDK. This is under Linux BTW, although I don't think it matters. So, I am pretty sure that they are not cheating, at least in my case.

  94. Use the correct terminology by AutoTheme · · Score: 0

    Think of the connection as a large pipe (your cable connection) with a small outflow valve (your modem), connected to a larger, higher pressure pipe (your ISP). Until your local pipe is full, you can put water into it as fast as you desire. But once it is full, the volume slows down because you can only put in as much as you are taking out (your cable modem connection/outflow valve). So what speakeasy and various other speed testing sites see is the effect of filling up your local pipe (your connection to your ISP).


    TUBES not PIPES!
  95. Why is this here? by singingjim1 · · Score: 0

    Seriously. I know this will probably be modded redundant, but this is a non-story. Comcast ADVERTISES THIS! Downloads get a temporary speed boost. It's part of the service and it works pretty well, if my software update download speeds are any indication. I'm not going to be a \. basher, but where's the quality control?

    1. Re:Why is this here? by jerunamuck · · Score: 1

      Think of this as education.
      While it's common practice, most consumers who look to /. for objective information don't understand the difference between bandwidth and throughput. Unfortunately I could not find any end user suitable tools for measuring throughput. While Stanford has a decent list of tools it's by no means exhaustive and they're not packaged for the end user.
      http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html#thruput

      FWIW, the poster's measurement of throughput, crude though it is, is way better than I see through Time Warner during normal business hours. It's unfortunate what we yanks pass off as Broadband, but then again; when was the last time you read about a horribly obtuse piece of pork barrel legislation on /. and immediately called your legislature to complain about it? Now if you'll excuse me, I have to compose an email to WHO and threaten to withhold my pittance of support of they don't get their $#|t together.

    2. Re:Why is this here? by singingjim1 · · Score: 0

      Well let me know how that works out for you. Getting back to what the post was about, I see excellent throughput on my Comcast line anytime I need something of bigger than average girth. As a matter of fact, I get slower speeds when I run a speedtest than when I'm actually downloading something. I routinely see speeds upwards of 600 kbps and I even once witnessed a burst of 1350 kbps for an MS download recently. Granted, it throttles back after a short time, but that burst saves a hell of a lot of time. I hate Comcast cable TV (I have HDTV and their signal sucks), but I've loved the poor excuse for broadband. It's been getting better and I imagine it will continue doing so as consumers expect more and better service.

  96. Lots of reasons by crmartin · · Score: 1

    ... but the biggest one is that file size (like a lot of other things) has a "long ail" distribution, ie, if you had a histogram of file asizes,there would be many more of them than big files. So if you weight bandwidth to maximum speed for little files, you dramatically improve average throughput.

  97. Not hard to get fully advertised bandwidth les 01% by IBitOBear · · Score: 2, Interesting

    For all this crying, I found it very easy to get my full advertised rate from Comcast. I use a Linux box and throttle my upstream flow so as never to lose a TCP ACK in the virtually non-existent transmit buffer in my cable modem. Never lose an ACK means never suffer from TCP throttling.

    Since TCP accelerates linearly and falls back exponentially, each fallback is disastrous, and if you fall back once, you are likely to do it several times in a row from the same cause.

    So find out what your upstream speed is _supposed_ to be and throttle your output to between 98 and 99 percent of that value and you will get a good 7.8mbps sustained download rates.

    Of course the average consumer doesn't know how to do this, but that isn't Comcast's fault. It's just wasted bandwidth.

    --
    Innocent people shouldn't be forced to pay for inferior software development.
    --"Code Complete" Microsoft Press
  98. Comcast cheating? by nurb432 · · Score: 1

    Never, cant be true.

    --
    ---- Booth was a patriot ----
  99. Just normal traffic shaping? by mindstrm · · Score: 1

    Lots of interesting explanations here..

    This could also equally be normal, every-day traffic shaping.

    Even simple shaping algorithms let you set some level of overflow before you start dropping packets.. it smooths things out.

  100. It's normal by Rodney2008 · · Score: 1

    My cable company gives me a PowerBoost feature for free. Your contract promises you a minimum amount of bandwidth. When the cable company has extra bandwidth available you get more speed for free.

    I've noticed that even when a downloading DVD iso of Linux (gigabytes in size) that the speedboost kicks in pretty well. Some days I get more and some days I get less. I've always had my minimum promised speed though.

  101. Re:Well this article was Enlightening in one aspec by aurispector · · Score: 1

    This mirrors my Comcast experience exactly. I've noticed that the various online bandwidth testers invariably show a much greater link speed than achieved with large downloads. Typically I can get about 750 KBps downloading, but much higher bursts in the beginning of the download. The link will start at about 1.5 MBps then scale back consistently to about half that. Basically, these guys are stealing my money if you go by the advertised speeds. Still, it's faster than my old DSL line. Verizon is busy stringing up FIOS in the area and if it does turn out to be a better deal then Comcast can kiss my butt.

    --
    I have mod points. The reign of terror begins now.
  102. my understanding by sentientbrendan · · Score: 1

    is that ISPs have always done this. In effect, this behavior makes things like HTTP and small file downloads seem very snappy at the expense of larger file transfers.

    It actually isn't that bad of a policy in that it prioritizes real time operations over batch jobs. Your CPU scheduler acts similarly. It does become a problem if the base rate really sucks.

  103. The real issue... by Anonymous Coward · · Score: 0

    So 15 Mbps down and 4 Mbps counts as 'amazingly fast' in the US? Are you joking? In Japan with a 54-Mbps DSL connection (about $45 a month) I find the primary limit on bittorrent is the speed of my notebook harddrive.

  104. Re:USERS CHEAT THEMSELVES cause they don't researc by jthill · · Score: 1

    My adblock plus blacklist is pretty short. Not all that many adservers really treat you like prey, and adblock lets you treat them the same way in return. It's a shame so many of /.'s ads are animated. Every time I unblock them I stop feeling guilty about blocking them again.

    --
    As always, all IMO. Insert "I think" everywhere grammatically possible.
  105. Isn't that an advertised feature of many services? by jonadab · · Score: 1

    The article summary sounds for all the world like a description of a burstable connection, which is widely considered a selling point. I'm not sure how _valuable_ a feature it is, but a lot of ISPs advertise it, along the lines of "768 KBPS downstream bandwidth, burstable to 1.5MBPS" or similar. This has been around for a long time. In fact, I am almost certain burstable connections were around before DSL.

    --
    Cut that out, or I will ship you to Norilsk in a box.
  106. browse in frames? by Psychofreak · · Score: 1

    I tend to browse in frames with about 5 to 10 frames open at a time, and a separate window per topic I am browsing. Let's say...one for comics, one for Slashdot and one for whatever I am really doing at the time. My ISP sucks for latency when I am doing things like games, but if I am doing lots of small DL or some large-ish DL (larger than 1228x1024 images) then I get good performance this way and when I am done with each page, the next is usually ready. I have not downloaded any iso's lately to tell you how that goes.

    Phil

    --
    Laugh, it's good for you!
  107. Comcast Power Boost is a good thing by Snookman · · Score: 1

    Anyone sending or receiving attachments via email will be happy for Power Boost. It will download at very fast speeds the first 25MB of a download. Clears the pipes so to speak.

  108. USERS CHEAT THEMSELVES cause they dont research by electrictroy · · Score: 1

    >>>>> Broadband, like dialup, is subsidized by the low use casual customers.

    >>> In other words the casual user is paying too much.

    Well...

    That's true, but only because the "casual user" didn't do their research. People can still get $7.00 a month Netscape dialup accounts (unlimited usage). This is what I have for travel, and it works just fine for web-browsing. And there is a wide variety of other plans available:

    - free
    - $7 for dialup
    - $15 for minimal broadband
    -~$40 for standard broadband
    -~$80 for maximal broadband

    The various companies offer the users different options based upon how much bandwidth they think they will need. If a low-usage person pays more than what he/she needs, well then maybe they should downgrade & save some money. (IMHO).

    Conclusion:

    Per usual, it comes down to the casual, low-usage customer cheating him or herself. If they were wise, they'd get a cheap $7 dialup or $15 DSL connection, but because they didn't do their research, they end-up paying around $40 a month --- far far more than they need to pay.

    And that's their problem, not mine.
    I pay my fair share ($80) for my habit.

    --
    The government is not your daddy. Its purpose is not to raid middle-class neighbors' wallets and give it to you.
  109. Same in SF Area by joe_n_bloe · · Score: 1

    This agrees with my observations here too. I guess it's a feature, because more bandwidth is always a feature.

  110. I have fast Comcast internet by trelony · · Score: 1

    I regularly download Firefox and Thunderbird updates with speeds around 1.4MB per second. It is about 12Mbps. So not just test sites are fast. - Alexey.

  111. Re:USERS CHEAT THEMSELVES cause they don't researc by mikael · · Score: 1

    It's not just IMDb.com. Vodafone have a customer accounts webpage that allows anyone to check the balance on their account, which is great for wireless modems. Except of course, you have go through three pages of corporate logos, login prompts and adverts.

    Going back to the days of dial-up speeds really makes it obvious where all the bandwidth is going... fancy full-screen wide curvy squiggly frames, flash movies, clicky-soundy buttons, pop-up animations, fancy animated sparkly animations that follow the pointer around...

    Thank goodness for text only browsers.

    --
    Vintage computer adverts: http://www.vintageadbrowser.com/computers-and-software-ads