> On 21. Feb 2019, at 09:32, Kubilay Kocak <ko...@freebsd.org> wrote: > > 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? Will implement this and add you to the review.
Best regards Michael > _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
