Extreme congestion (was Re: inter-domain link recovery)

Mikael Abrahamsson swmike at swm.pp.se
Thu Aug 16 20:55:59 UTC 2007

On Thu, 16 Aug 2007, Fred Baker wrote:

> world, they're perfectly happen to move it around the world. Hence, moving a 
> file into a campus doesn't mean that the campus has the file and will stop 
> bothering you. I'm pushing an agenda in the open source world to add some 
> concept of locality, with the purpose of moving traffic off ISP networks when 
> I can. I think the user will be just as happy or happier, and folks pushing 
> large optics will certainly be.

With the regular user small TCP window size, you still get a sense of 
locality as more data during the same time will flow from a source that is 
closer to you RTT-wise than from one that is far away.

We've been pitching the idea to bittorrent tracker authors to include a 
BGP feed and prioritize peers that are in the same ASN as the user 
himself, but they're having performance problems already so they're not so 
keen on adding complexity. If it could be solved better at the client 
level that might help, but the end user who pays flat rate has little 
incentive to help the ISP in this case.

Mikael Abrahamsson    email: swmike at swm.pp.se

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