Date: Tue, 18 Dec 2007 15:54:41 +1100 From: Lawrence Stewart <lastewart@swin.edu.au> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Iccrg@cs.ucl.ac.uk, tmrg-interest@ICSI.Berkeley.EDU, end2end-interest@postel.org Cc: James Healy <jhealy@swin.edu.au>, grenville armitage <garmitage@swin.edu.au>, David Malone <David.Malone@nuim.ie>, Randall Stewart <rrs@cisco.com>, Fred Baker <fred@cisco.com>, Douglas Leith <Doug.Leith@nuim.ie>, Robert Shorten <Robert.Shorten@nuim.ie>, Larry Dunn <ldunn@cisco.com> Subject: Modular/Pluggable TCP Congestion Control for FreeBSD Message-ID: <47675291.5070101@swin.edu.au>
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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]. Cheers, Jim and Lawrence http://caia.swin.edu.au [1] http://caia.swin.edu.au/reports/071218A/CAIA-TR-071218A.pdf [2] http://www.hamilton.ie/net/htcp3.pdf [3] http://caia.swin.edu.au/urp/newtcp/tools.html
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