Date: Thu, 21 Feb 2019 19:32:41 +1100 From: Kubilay Kocak <koobs@FreeBSD.org> To: Michael Tuexen <tuexen@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r344368 - head/sys/netinet Message-ID: <7b4f29d5-e909-6397-7c24-b5979a3963c1@FreeBSD.org> In-Reply-To: <201902201803.x1KI3haW078567@repo.freebsd.org> References: <201902201803.x1KI3haW078567@repo.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 21/02/2019 5:03 am, Michael Tuexen wrote: > Author: tuexen > Date: Wed Feb 20 18:03:43 2019 > New Revision: 344368 > URL: https://svnweb.freebsd.org/changeset/base/344368 > > Log: > Reduce the TCP initial retransmission timeout from 3 seconds to > 1 second as allowed by RFC 6298. > > Reviewed by: kbowling@, Richard Scheffenegger > Sponsored by: Netflix, Inc. > Differential Revision: https://reviews.freebsd.org/D18941 > > Modified: > head/sys/netinet/tcp_syncache.c > head/sys/netinet/tcp_timer.h > > Modified: head/sys/netinet/tcp_syncache.c > ============================================================================== > --- head/sys/netinet/tcp_syncache.c Wed Feb 20 17:56:38 2019 (r344367) > +++ head/sys/netinet/tcp_syncache.c Wed Feb 20 18:03:43 2019 (r344368) > @@ -159,7 +159,7 @@ static int syncookie_cmp(struct in_conninfo *inc, str > * tcp_backoff[1] + > * tcp_backoff[2] + > * tcp_backoff[3]) + 3 * tcp_rexmit_slop, > - * 3000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 45600 ms, > + * 1000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 15600 ms, > * the odds are that the user has given up attempting to connect by then. > */ > #define SYNCACHE_MAXREXMTS 3 > > Modified: head/sys/netinet/tcp_timer.h > ============================================================================== > --- head/sys/netinet/tcp_timer.h Wed Feb 20 17:56:38 2019 (r344367) > +++ head/sys/netinet/tcp_timer.h Wed Feb 20 18:03:43 2019 (r344368) > @@ -77,7 +77,7 @@ > #define TCPTV_MSL ( 30*hz) /* max seg lifetime (hah!) */ > #define TCPTV_SRTTBASE 0 /* base roundtrip time; > if 0, no idea yet */ > -#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */ > +#define TCPTV_RTOBASE ( 1*hz) /* assumed RTO if no info */ > > #define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */ > #define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */ > _______________________________________________ Any way this can be a run-time tunable?
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?7b4f29d5-e909-6397-7c24-b5979a3963c1>