On 28.10.2012 23:01, Rui Paulo wrote:
On Oct 28, 2012, at 14:56, Andre Oppermann <an...@freebsd.org> wrote:
On 28.10.2012 22:34, Rui Paulo wrote:
On 28 Oct 2012, at 12:02, Andre Oppermann <an...@freebsd.org> wrote:
Author: andre
Date: Sun Oct 28 19:02:07 2012
New Revision: 242261
URL: http://svn.freebsd.org/changeset/base/242261
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.
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 links?
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.
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.
RFC6298.
--
Andre
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