Date: Fri, 1 Jun 2018 21:24:27 +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: r334497 - head/sys/netinet Message-ID: <201806012124.w51LORAf060554@repo.freebsd.org>
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Author: tuexen Date: Fri Jun 1 21:24:27 2018 New Revision: 334497 URL: https://svnweb.freebsd.org/changeset/base/334497 Log: Limit the retransmission timer for SYN-ACKs by TCPTV_REXMTMAX. Use the same logic to handle the SYN-ACK retransmission when sent from the syn cache code as when sent from the main code. MFC after: 3 days Sponsored by: Netflix, Inc. Modified: head/sys/netinet/tcp_syncache.c Modified: head/sys/netinet/tcp_syncache.c ============================================================================== --- head/sys/netinet/tcp_syncache.c Fri Jun 1 21:24:10 2018 (r334496) +++ head/sys/netinet/tcp_syncache.c Fri Jun 1 21:24:27 2018 (r334497) @@ -415,8 +415,14 @@ syncache_drop(struct syncache *sc, struct syncache_hea static void syncache_timeout(struct syncache *sc, struct syncache_head *sch, int docallout) { - sc->sc_rxttime = ticks + - TCPTV_RTOBASE * (tcp_syn_backoff[sc->sc_rxmits]); + int rexmt; + + if (sc->sc_rxmits == 0) + rexmt = TCPTV_RTOBASE; + else + TCPT_RANGESET(rexmt, TCPTV_RTOBASE * tcp_syn_backoff[sc->sc_rxmits], + tcp_rexmit_min, TCPTV_REXMTMAX); + sc->sc_rxttime = ticks + rexmt; sc->sc_rxmits++; if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) { sch->sch_nextc = sc->sc_rxttime;
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