In Australia, Telstra have restricted outgoing port 25 for ADSL customers. Anyone with a static IP isn't blocked. Given you have to ask for static IP and pay a little extra, people who bother are probably more aware of the implications.
Ok, the static thing is well established. That's why planes actually have a grounding cable connected to them before a fuel nozzle is brought anywhere near them. Any plane, any bowser, same procedure.
Mobile phones emit RF energy. So does a discman. So does the cable delivering power to the bowser. So does the CB on a passing truck. So do the fluorescent and other types of lighting all over the shop and even in some bowsers. So does your engine - are we to drive in and drive away without using our engines?
But hey, if you think the RF is a risk, it could put a whole new slant on "war driving":-)
Agreed, it's part of the design. Collisions do not use a significant proportion - normally. If they do, they indicate a problem. The problem can be as simple as trying to reach the maximums allowed (something like 180m cable in 5 segments, only 3 of which can have active nodes, between any two points on the network, and certain number of nodes on each segment). Back when I looked it up, I had a network within spec, and with acceptable losses, but under load the collisions were much > 10%.
Now I only worry when my switches are reporting "excessive late collisions" - reflecting a real problem such as a mismatch between full and half duplex operation. And I still have 10M single-segment LANs in small sites with only a few nodes. I don't have any token ring LANs now. (anyone want to buy a MAU?)
As with previous response - the report you link recommends: "minimize the number of devices on any given LAN" and "use high performance bridges and routers"
and gets more interesting..
"(5) Increase Channel Bandwidth The more bandwidth available to the stations, the lower the likelihood that they can create short-term overload conditions. While no one should spend money wastefully, the judicious application of high-speed LAN technologies (e.g., Fast Ethernet or FDDI) on critical segments can reduce packet discard due to channel congestion.
(6) Solve the Capture Effect The capture effect can be a major cause of frame discard when using modern, high performance hosts and Ethernet implementations. This is discussed in detail below.
3. Capture Effect Capture effect is the term used to describe a well-known and understood idiosyncrasy of the Ethernet Medium Access Control (MAC) backoff algorithm [4]. It is considered a minor flaw in the original Ethernet design, but is now firmly entrenched through formal specifications, international standardization, and numerous silicon implementations. Before the development of modern, high-performance LAN controllers and systems were possible, the effect was rarely (if ever) seen, and did not impact higher layer protocol operation or user performance. The emergence of networked systems capable of offering continuous, high load to an Ethernet made the capture effect visible and focused attention on its impact and solutions." [ goes on to describe in detail, with mention of solutions proposed at the time ]
High-level optimisation before worrying about low-level? Absolutely. You could start even higher up, and discover that often the wrong problem is being solved. How's that for inefficient?
Regarding the assignments, it's a sad story but actually comes back to documented requirements and documenting the change in requirements. (Did the original assessor sign his name to his mid-task comments?)
Back on the article, yeah, ok, sounds fair, but.. - My kids still use a 200MHz machine, and simple flash animations bog it down. I remember Wolf 3D running on 33MHz machines. What the?
- My mobile phone (with palmos) has more CPU & non-volatile storage than my first five personal computers did, and my current desktop has 200 times as much again. If I weren't developing software, viewing inefficient web-hosted graphics/animations or Word documents, and being in an Active Directory, I'd probably settle for a PDA with external screen and keyboard -- or any of the PCs we're currently chucking out as "worthless".
Yes yes! Many queries' execution times are an exponent of the size of the data set. I'm sure that happens in other areas, but usually it's not so dramatic.
I've been using IBM's DB/2. They've done some great things with optimisation, but every time they improve it, they also add new (useful) query features that can but blow out the optimisation if not used carefully.
Having reports written by someone who doesn't understand which side is which in a LEFT JOIN rather got up my nose for a while...
Well, nothing in the os itself. Win9x was developed by a different group than NT. The 95 shell was written in assembler, so had to be rewritten completely for NT (which then supported non-intel) to get it in C. Not sure what happened at 95 - 98 transition though. Drivers were still separate AFAIK. Kernel obviously separate. Do you remember how many Win APIs there were back in the 90's? Or when OS/2 supported more Windows APIs simultaneously than any single version of Windows did?
Not sure what the implications are for applications though, such as IE which had '9x updates but are still current on newer Windowses.
Valid point - the balance is different for personal than for business. It also depends whether you have variable hours. If I can work another hour and earn another $X..
In some workplaces, it even goes the other way. Hours of work are buried untraceably, while capital expenditure is examined by many levels of management. Not saying that's good, but it certainly happens.
Print statements allow something that many other debugging tools don't - they can be run by a client on their own systems. The larger a system, the more potential for problems to hide for years until the right data/request exposes it.
The prints don't even have to be "all on" or "all off". You should see the amount of information coming out of some IBM software when you set the highest possible trace levels though - it's often enough that the vendor can determine the cause of an obscure problem without having the entire customer data set.
Not saying they don't use other tools, and I don't work for IBM.
A few assumptions, perhaps, (like whether the universe has a size), but the same laws that allow for a "big bang" also allow for a white hole - in which case some parts of the universe could be billions of years old, while others (nearer the middle-ish" would be much younger due to that "time" being spent under immense gravity and therefore very slow.
Or do you mean the "law" of evolution? Last time I checked, that was a theory, not a law.
Or the notion that fossils must be millions of years old to be burried (undisturbed) under so many layers? Arguably these are only possible as result of tremendous turbulance and much matter moving rapidly. Perhaps due to, say, a global flood?
Or the law that "I'll do and believe whatever I want to, regardless" - I can see that one remaining as long as humans are capable of choosing.
Or perhaps the law of "anyone on who writes on slashdot will find someone disagrees with them". I don't think that one will be negated either:-)
Unless you have a fantastic product and have cornered the market for a great margin, services is where the money is. You might have to work at a low level sometimes, but there's as much need for high-level services. That's where people charge 3-digit hourly rates, and where someone who does a good job keeps getting invited back.
People keep forgetting that the "big bang" didn't happen in a place. IF it happened, it happened everywhere, hence the word "big", and the universe is infinite.
Alternately, it might not have been BB, but a white hole, and the universe has a size, and time was very slow near the centre for a while due to gravitational effects.
I've done 85km of 256kbps using off-the-shelf equipment, 30mW output, but that was point to point with highly directional antennas with signal strength equivalent to 3W omni (staying licence-free). A broad service as proposed would presumably use omnidirectional antenna at the tower, though directional at client premises.
... and in regional / rural Australia, the CDMA mobile network has by far the greatest coverage. It's still improving, and a lot of holes are being closed.
Upgrading CDMA to 1xRTT is incremental and compatible. The only issue is pricing of data over the network...
That's a few different scenarios, with different implications. Speaking from Australian perspective...
- Supermarkets playing radio, or companies using radio for "music on hold" need to licence via tha radio station. It could be argued to extend that to taxis, but that's getting picky.
- Churches and schools don't need to licence what they sing internally. You can't stop people singing a song just for themselves... (it's not going to take income away from anyone).
- They do have to pay to reproduce words (overhead projection, or songsheets), and photocopies of music (treated differently). The hard part is copying recorded music to practise with - illegal, but danged near impossible to get around without buying heaps of CDs.
- Public performances are different to singing "in church" or at school; a concert would require licence payments.
- Public performance of new items are often be refused by copyright owners. e.g. performing a collection of songs from a musical that is still on its first world tour.
Personally I find it hard to describe the question of implants as "fundamental" to Christian faith at this time. I'd say the fundamentals have something to do with mankind's created purpose, our sin, Christ's fulfillment of the law, our forgiveness as a gift we cannot earn...
There will be a day when the "mark of the beast" becomes a much more central issue, and arguably fundamental, but I expect it will be completely obvious at the time.
Slashdot Mirror
In Australia, Telstra have restricted outgoing port 25 for ADSL customers. Anyone with a static IP isn't blocked. Given you have to ask for static IP and pay a little extra, people who bother are probably more aware of the implications.
A number of corporates also disable inline images by policy, or thanks to defaults (Lotus Domino 5).
Around here,
CWA = Country Womens' Association.
Some mob are taking on a bunch of old ladies?
Ok, the static thing is well established. That's why planes actually have a grounding cable connected to them before a fuel nozzle is brought anywhere near them. Any plane, any bowser, same procedure.
:-)
Mobile phones emit RF energy. So does a discman. So does the cable delivering power to the bowser. So does the CB on a passing truck. So do the fluorescent and other types of lighting all over the shop and even in some bowsers. So does your engine - are we to drive in and drive away without using our engines?
But hey, if you think the RF is a risk, it could put a whole new slant on "war driving"
Insightful! Pity the topic is way off the front page at this point.
Agreed, it's part of the design.
Collisions do not use a significant proportion - normally. If they do, they indicate a problem. The problem can be as simple as trying to reach the maximums allowed (something like 180m cable in 5 segments, only 3 of which can have active nodes, between any two points on the network, and certain number of nodes on each segment). Back when I looked it up, I had a network within spec, and with acceptable losses, but under load the collisions were much > 10%.
Now I only worry when my switches are reporting "excessive late collisions" - reflecting a real problem such as a mismatch between full and half duplex operation.
And I still have 10M single-segment LANs in small sites with only a few nodes. I don't have any token ring LANs now. (anyone want to buy a MAU?)
As with previous response - the report you link recommends:
"minimize the number of devices on any given LAN"
and
"use high performance bridges and routers"
and gets more interesting..
"(5) Increase Channel Bandwidth
The more bandwidth available to the stations, the lower the likelihood that they can create short-term overload conditions. While no one should spend money wastefully, the judicious application of high-speed LAN technologies (e.g., Fast Ethernet or FDDI) on critical segments can reduce packet discard due to channel congestion.
(6) Solve the Capture Effect
The capture effect can be a major cause of frame discard when using modern, high performance hosts and Ethernet implementations. This is discussed in detail below.
3. Capture Effect
Capture effect is the term used to describe a well-known and understood idiosyncrasy of the Ethernet Medium Access Control (MAC) backoff algorithm [4]. It is considered a minor flaw in the original Ethernet design, but is now firmly
entrenched through formal specifications, international standardization, and numerous silicon implementations. Before the development of modern, high-performance LAN controllers and systems were possible, the effect was rarely
(if ever) seen, and did not impact higher layer protocol operation or user performance. The emergence of networked systems capable of offering continuous, high load to an Ethernet made the capture effect visible and focused attention on its impact and solutions."
[ goes on to describe in detail, with mention of solutions proposed at the time ]
Good report - I wish I had it at the time.
According to /. title, it's for x86, but not sure which generation.
At least at that speed it won't need a heatstink.
oops.
High-level optimisation before worrying about low-level? Absolutely. You could start even higher up, and discover that often the wrong problem is being solved. How's that for inefficient?
Regarding the assignments, it's a sad story but actually comes back to documented requirements and documenting the change in requirements. (Did the original assessor sign his name to his mid-task comments?)
Back on the article, yeah, ok, sounds fair, but..
- My kids still use a 200MHz machine, and simple flash animations bog it down. I remember Wolf 3D running on 33MHz machines. What the?
- My mobile phone (with palmos) has more CPU & non-volatile storage than my first five personal computers did, and my current desktop has 200 times as much again. If I weren't developing software, viewing inefficient web-hosted graphics/animations or Word documents, and being in an Active Directory, I'd probably settle for a PDA with external screen and keyboard -- or any of the PCs we're currently chucking out as "worthless".
Yes yes!
Many queries' execution times are an exponent of the size of the data set.
I'm sure that happens in other areas, but usually it's not so dramatic.
I've been using IBM's DB/2. They've done some great things with optimisation, but every time they improve it, they also add new (useful) query features that can but blow out the optimisation if not used carefully.
Having reports written by someone who doesn't understand which side is which in a LEFT JOIN rather got up my nose for a while...
Well, nothing in the os itself.
Win9x was developed by a different group than NT. The 95 shell was written in assembler, so had to be rewritten completely for NT (which then supported non-intel) to get it in C. Not sure what happened at 95 - 98 transition though.
Drivers were still separate AFAIK.
Kernel obviously separate.
Do you remember how many Win APIs there were back in the 90's? Or when OS/2 supported more Windows APIs simultaneously than any single version of Windows did?
Not sure what the implications are for applications though, such as IE which had '9x updates but are still current on newer Windowses.
Or is he linked from the 419 flash mob pages? (slashdot yro item today)
Valid point - the balance is different for personal than for business.
It also depends whether you have variable hours. If I can work another hour and earn another $X..
In some workplaces, it even goes the other way. Hours of work are buried untraceably, while capital expenditure is examined by many levels of management. Not saying that's good, but it certainly happens.
What do you call a "big" hardware item?
And what hourly rate do you use to evaluate the time spent looking for a better price?
Some people have more time than money, but some waste incredible amounts of time trying to save a couple of dollars.
Print statements allow something that many other debugging tools don't - they can be run by a client on their own systems. The larger a system, the more potential for problems to hide for years until the right data/request exposes it.
The prints don't even have to be "all on" or "all off". You should see the amount of information coming out of some IBM software when you set the highest possible trace levels though - it's often enough that the vendor can determine the cause of an obscure problem without having the entire customer data set.
Not saying they don't use other tools, and I don't work for IBM.
... and most of those laws weren't even physics!
Um, which laws of physics need to be re-written?
:-)
A few assumptions, perhaps, (like whether the universe has a size), but the same laws that allow for a "big bang" also allow for a white hole - in which case some parts of the universe could be billions of years old, while others (nearer the middle-ish" would be much younger due to that "time" being spent under immense gravity and therefore very slow.
Or do you mean the "law" of evolution? Last time I checked, that was a theory, not a law.
Or the notion that fossils must be millions of years old to be burried (undisturbed) under so many layers? Arguably these are only possible as result of tremendous turbulance and much matter moving rapidly. Perhaps due to, say, a global flood?
Or the law that "I'll do and believe whatever I want to, regardless" - I can see that one remaining as long as humans are capable of choosing.
Or perhaps the law of "anyone on who writes on slashdot will find someone disagrees with them". I don't think that one will be negated either
Just my 2c worth of flamebait...
good judgement comes from experience.
:-)
experience comes from bad judgement.
so, go and make some mistakes somewhere
Ok, thanks for the chocolate. Now here it is:
dontbestupidimnotgivingyoutherealpassword
Where I grew up these were used to protect fruit trees.
Wait a minute... they used the gas canons (very loud boom) to scare birds away. They used rockets to spray crystals into the clouds to prevent hail.
I wonder if anyone pointed a canon upward??
I wonder what happens when a rocket falls on a car..
I wonder if many birds were hit by rockets..
Unless you have a fantastic product and have cornered the market for a great margin, services is where the money is. You might have to work at a low level sometimes, but there's as much need for high-level services. That's where people charge 3-digit hourly rates, and where someone who does a good job keeps getting invited back.
People keep forgetting that the "big bang" didn't happen in a place. IF it happened, it happened everywhere, hence the word "big", and the universe is infinite.
Alternately, it might not have been BB, but a white hole, and the universe has a size, and time was very slow near the centre for a while due to gravitational effects.
I've done 85km of 256kbps using off-the-shelf equipment, 30mW output, but that was point to point with highly directional antennas with signal strength equivalent to 3W omni (staying licence-free).
A broad service as proposed would presumably use omnidirectional antenna at the tower, though directional at client premises.
... and in regional / rural Australia, the CDMA mobile network has by far the greatest coverage. It's still improving, and a lot of holes are being closed.
Upgrading CDMA to 1xRTT is incremental and compatible. The only issue is pricing of data over the network...
That's a few different scenarios, with different implications.
Speaking from Australian perspective...
- Supermarkets playing radio, or companies using radio for "music on hold" need to licence via tha radio station. It could be argued to extend that to taxis, but that's getting picky.
- Churches and schools don't need to licence what they sing internally. You can't stop people singing a song just for themselves... (it's not going to take income away from anyone).
- They do have to pay to reproduce words (overhead projection, or songsheets), and photocopies of music (treated differently). The hard part is copying recorded music to practise with - illegal, but danged near impossible to get around without buying heaps of CDs.
- Public performances are different to singing "in church" or at school; a concert would require licence payments.
- Public performance of new items are often be refused by copyright owners. e.g. performing a collection of songs from a musical that is still on its first world tour.
Personally I find it hard to describe the question of implants as "fundamental" to Christian faith at this time. I'd say the fundamentals have something to do with mankind's created purpose, our sin, Christ's fulfillment of the law, our forgiveness as a gift we cannot earn...
There will be a day when the "mark of the beast" becomes a much more central issue, and arguably fundamental, but I expect it will be completely obvious at the time.