Date: Tue, 18 Dec 2007 10:53:18 -0800 From: Fred Baker <fred@cisco.com> To: Lawrence Stewart <lastewart@swin.edu.au>, Andre Oppermann <andre@freebsd.org>, James Healy <jhealy@swin.edu.au> Cc: grenville armitage <garmitage@swin.edu.au>, freebsd-net@freebsd.org, Iccrg@cs.ucl.ac.uk, Randall Stewart <rrs@cisco.com>, tmrg-interest@ICSI.Berkeley.EDU, end2end-interest@postel.org, David Malone <David.Malone@nuim.ie>, Douglas Leith <Doug.Leith@nuim.ie>, Robert Shorten <Robert.Shorten@nuim.ie>, Larry Dunn <ldunn@cisco.com> Subject: Re: Modular/Pluggable TCP Congestion Control for FreeBSD Message-ID: <7B13FFEE-F69D-4EBA-B734-356D8E63FDC7@cisco.com> In-Reply-To: <4767C338.4070709@freebsd.org> References: <47675291.5070101@swin.edu.au> <4767C338.4070709@freebsd.org>
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Thanks to each of you. On Dec 18, 2007, at 4:55 AM, 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
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