Date: Tue, 18 Dec 2007 15:24:40 +0000 From: Rui Paulo <rpaulo@FreeBSD.org> To: Andre Oppermann <andre@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Modular/Pluggable TCP Congestion Control for FreeBSD Message-ID: <86sl20nhzb.wl%rpaulo@fnop.net> In-Reply-To: <4767C338.4070709@freebsd.org> References: <47675291.5070101@swin.edu.au> <4767C338.4070709@freebsd.org>
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Rui Paulo At Tue, 18 Dec 2007 13:55:20 +0100, Andre Oppermann wrote: > > Lawrence Stewart wrote: > > Hi all, > > We've been involved in a research project to implement and test an > > emerging TCP congestion control algorithm under FreeBSD. As a part of > > this, we've put together a patch for FreeBSD 7.0-BETA4 that modularises > > the congestion control code in the TCP stack. It allows for new > > congestion control algorithms to be developed as loadable kernel modules. > > This improves FreeBSD's usefulness as a TCP research platform and > > makes > > it easier to customise the stack for specific scenarios like high > > bandwidth, long delay paths. > > There is an accompanying technical report "Light-Weight Modular > > TCP Congestion Control for FreeBSD 7" [1] that covers the design, > > features, kernel interface and usage of the framework. Also on our > > website is > > a beta release of a module that implements the H-TCP[2] congestion control > > algorithm proposed by the Hamilton Institute. > > We believe that modular congestion control is a worthwhile addition > > to > > FreeBSD. We've performed significant internal testing and there are > > currently no known issues or regressions with the implementation > > compared to a 'vanilla' FreeBSD 7.0-BETA4 kernel. We would welcome > > further review and testing from the wider community in the hope of > > getting this > > patch folded into FreeBSD 8-CURRENT. > > SIFTR [3], our tool for monitoring FreeBSD kernel TCP connection > > state, has also > > received a minor update to v1.1.5, with the addition of 6 new, > > useful variables. > > All code and documentation is available on our website[3]. > > I've started to completely overhaul tcp_input and tcp_output > including separating out the congestion control. Actually it > is similiar to the way you seem to do it. > > A quick glance at your patch shows a couple of style issues > and a complete lack of locking. > > Let me get you a Perforce account so we can develop and complete > this work together. I'll create a Perforce branch and import my > code and work in progress. Andre, perhaps you could keep us, committers, more up to date with your projects? I've been asked to port my NetBSD tcp_congctl(9) API to FreeBSD at some point in time and I wasn't aware that you were working on the same thing. Perhaps you could create a branch for you in p4 so we could follow your work? Thanks. -- Rui Paulo
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