Date: Sun, 28 Oct 2012 14:03:08 -0700 From: Rui Paulo <rpaulo@felyko.com> To: Andre Oppermann <andre@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r242266 - head/sys/netinet Message-ID: <4532DEB1-4EFE-4E4B-BE1F-A99FFC58DBA3@felyko.com> In-Reply-To: <201210281947.q9SJlku2085767@svn.freebsd.org> References: <201210281947.q9SJlku2085767@svn.freebsd.org>
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On 28 Oct 2012, at 12:47, Andre Oppermann <andre@FreeBSD.org> wrote: > Author: andre > Date: Sun Oct 28 19:47:46 2012 > New Revision: 242266 > URL: http://svn.freebsd.org/changeset/base/242266 > > Log: > Increase the initial CWND to 10 segments as defined in IETF TCPM > draft-ietf-tcpm-initcwnd-05. It explains why the increased initial > window improves the overall performance of many web services without > risking congestion collapse. > > As long as it remains a draft it is placed under a sysctl marking it > as experimental: > net.inet.tcp.experimental.initcwnd10 = 1 > When it becomes an official RFC soon the sysctl will be changed to > the RFC number and moved to net.inet.tcp. > > This implementation differs from the RFC draft in that it is a bit > more conservative in the case of packet loss on SYN or SYN|ACK because > we haven't reduced the default RTO to 1 second yet. Also the restart > window isn't yet increased as allowed. Both will be adjusted with > upcoming changes. > > Is is enabled by default. In Linux it is enabled since kernel 3.0. Didn't you also forget to point out the problems associated with it? http://tools.ietf.org/html/draft-gettys-iw10-considered-harmful-00 Regards, -- Rui Paulo
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