Date: Sun, 28 Oct 2012 15:01:24 -0700 From: Rui Paulo <rpaulo@felyko.com> To: Andre Oppermann <andre@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r242261 - head/sys/netinet Message-ID: <81A9846E-CC54-4822-A5B4-EF37D00B42B3@felyko.com> In-Reply-To: <508DAA07.9090103@freebsd.org> References: <201210281902.q9SJ272D078237@svn.freebsd.org> <6FC10C06-9288-4E2C-A1A2-33C5CC8086C5@felyko.com> <508DAA07.9090103@freebsd.org>
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On Oct 28, 2012, at 14:56, Andre Oppermann <andre@freebsd.org> wrote: > On 28.10.2012 22:34, Rui Paulo wrote: >> On 28 Oct 2012, at 12:02, Andre Oppermann <andre@FreeBSD.org> wrote: >>=20 >>> Author: andre >>> Date: Sun Oct 28 19:02:07 2012 >>> New Revision: 242261 >>> URL: http://svn.freebsd.org/changeset/base/242261 >>>=20 >>> Log: >>> For retransmits of SYN|ACK from the syncache use the slightly more >>> aggressive special tcp_syn_backoff[] retransmit schedule instead of >>> the normal tcp_backoff[] schedule for established connections. >>=20 >>=20 >> How did you came up with the values for tcp_syn_backoff? I obviously > > understand the aggressiveness, but did you measure any significant > > improvement in connection establishment time and if so, on what type of l= inks? >=20 > I didn't come up with the values. tcp_syn_backoff[] was introduced > almost 12 years ago by jlemon. For syncache it got lost somewhere > along the line. Oh, I see. I read it backwards.=20 >=20 > There has been recent talk by some large FreeBSD web server operators > of reducing SYN|ACK retransmit timeouts. This change fixes a part of > the problem. The recent RFC on reducing the RTO will fix the other > part. Which RFC? I'm only aware of draft-hurtig-tcpm-rtorestart.=20=
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