Date: Tue, 31 Jan 2006 23:15:10 -0600 (CST) From: Mike Silbersack <silby@silby.com> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: Van Jacobson's network stack restructure Message-ID: <20060131230540.R47296@odysseus.silby.com> In-Reply-To: <20060201012011.GP97116@wantadilla.lemis.com> References: <20060201012011.GP97116@wantadilla.lemis.com>
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On Wed, 1 Feb 2006, Greg 'groggy' Lehey wrote: > Last week, at the Linux.conf.au in Dunedin, Van Jacobson presented > some slides about work he has been doing rearchitecting the Linux > network stack. He claims to have reduced the CPU usage by 80% and > doubled network throughput (he expects more, but it was limited by > memory bandwidth). The approach looks like it would work on FreeBSD > as well. I spoke to him and he confirmed. > > He's currently trying to get the code released as open source, but in > the meantime his slides are up on > http://www.lemis.com/grog/Documentation/vj/. Yes, this is my web > site. The conference organizers are going to put it up on their web > site soon, but in the meantime he's asked me to put it were I can. > > Comments? > > Greg The slides alone don't tell much. There seem to be two possibilities - either "channelizing" everything is responsible for the improvements, or the fact that it waits until the socket is woken up to process the packets is responsible for the improvements. I can't understand why the final step involves a userland TCP stack. The rest of the presentation doesn't explain why that is necessary. I'm sure we'll learn more once we see the source. Mike "Silby" Silbersack
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