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.
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.
--
Andre
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
