Examining Bittorrent

ToyKeeper and other wrote in with this: "The Register published a detailed analysis of BitTorrent traffic and user habits today, focusing on four aspects: availability, integrity, download speeds, and ability to withstand flash crowds. BitTorrent carries 53% of all P2P traffic (or ~35% of all 'net traffic), and this paper helps explain why. Also included are data about torrent lifetime, network poisoning, response during downtime or attacks, and lots of pretty charts. A few performance problems are revealed, which will hopefully be addressed in future p2p systems." The original paper (pdf) is available.

Comments

Re:It's you who are to blame

[Porn Whitelist]

Poster wrote:

Yeah, right. Only an insignificant fraction of torrent traffic is legit. You really think that the scheme will remain legal because of these few users?

That's all it takes - see the Betamax decision. However, you might also want to take a look at the stats (below) for why people get high-speed internet.

... again ...

BitTorrent and the likes will be shut down in 2005. Mark my words. Since most of the traffic I see (I am an admin) is illegal, I'll shed no tears. It's you who violate copyrights who are to blame for the crackdown and the eventual clampdown on the internet - not RIAA, MPAA or any other corporation.

How are we supposed to "mark your words" when you post as an AC? Also, you seem to think that downloading music is illegal everywhere, when it's not. Not everyone lives in the US of BushCo. Also, the servers holding the torrent files are not breaking any laws.

From the article:

A few performance problems are revealed, which will hopefully be addressed in future p2p systems.

Well, since, according to El Reg http://www.theregister.co.uk/2004/12/08/brit_net_f ilth/ One in four Brits on net for Porn, there's a demand for "clittorrent".

The stats:

According to a survey conducted by British ISP Homecall, 23 per cent of Britons are getting broadband for the porn, and it's by far the most important factor in getting wired. 12 per cent cited access to music videos, 8 per cent access to movie trailers, and a gratifying 9 per cent for radio, which is undergoing a renaissance in the UK. Sometimes new media can be the best thing to happen to old media.

All the above are LEGAL.

Re:It's you who are to blame

[lheal]

• Yeah, right. Only an insignificant fraction of torrent traffic is legit.

Yup. All it takes is any.

The legal principal is this: if the {object, device, chemical, drug} has a purpose for which it is legal, then the thing should be legal.

The exceptions to this (guns, marijuana, and other things we've allowed to be banned) prove the rule. The pressure to legalize or ban something evinces arguments about its legitimate uses, and it's these arguments that are persuasive. Saying "We'll do it anyway" is unproductive.

In this case, since downloading Free software is so much more efficient with P2P, it's inappropriate to ban it even if that software is only a small percentage of the service's traffic.

Traffic estimate is suspect

[burris]

This paper and all of the recent news articles that provide an estimate for BitTorrent protocol traffic use the same source. A single slide in a presentation by someone from Cache Logic shows BT using 1/2 of all P2P traffic at a "tier 1 ISP." Other sources cite P2P traffic at 66% of all 'net traffic. Therefore, BT is 33%.

I think any estimate made without measurements at many major routers would be suspect. While there is no doubt that BT is quite popular, the evidence presented thus far for the amount of traffic using BT protocol is extremely flimsy. I would take it with a grain of salt.

burris

My response to the author:

[TheSHAD0W]

I have a few comments on your analysis of the BitTorrent protocol... My main criticism is that you are analyzing BitTorrent in combination with pirate web pages as a P2P file sharing system, when BitTorrent's real purpose is to be a file DISTRIBUTION system.

BitTorrent is designed to replace and enhance the performance of a standard http or ftp download server. Where even ten simultaneous downloads can slow the performance of most inexpensive server setups to a crawl, BitTorrent can easily handle ten thousand or more, and in this it is an enormous success.

One necessary element of a true BitTorrent distribution is a dedicated seed server. This server ought to be always working, and should have a significant amount of bandwidth behind it; I'd recommend 30KB/s minimum, but more is better. You complain that seeders are "punished" and this is why torrents die, but while long-term seeders are nice, they aren't necessary. It is better for me as a content distributor to allow people to close their torrent and play with their new download as soon as they'd like to. Having torrents die off when interest fades is an artifact of misuse of this specification.

You worry about pollution on Suprnova.org, and so do I; there's no reason why it wouldn't exist. But as BitTorrent was normally intended this isn't a problem at all. People visiting Blizzard's website to download content via BitTorrent (actually Blizzard uses a modified downloader, but the concept would be the same if users received a standard .torrent file) would obviously receive a genuine .torrent file, and the data in that file verifies the data received in the download. It's only torrent file redistributors like Suprnova.org where you'd need to be concerned about pollution.

You're also concerned about tracker availability. I recommend content distributors run their own trackers, which is an easy task given the numerous types of trackers available, including script-based trackers. There's no reason for a tracker to go down unless the web server goes down, in which case no one would probably be able to get a copy of the .torrent file anyway, and a standard download would also be blocked.

As a sharing method BitTorrent indeed has some deficiencies, but it simply wasn't designed for that. That BitTorrent is being misused for that purpose only testifies to its effectiveness. Perhaps a sharing system with elements taken from BitTorrent will someday arise; I know Suprnova.org is attempting to create one with "Exeem". But please don't badmouth BitTorrent. :-)