Date: Wed, 20 Feb 2019 18:03:43 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r344368 - head/sys/netinet Message-ID: <201902201803.x1KI3haW078567@repo.freebsd.org>
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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 */
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