From owner-svn-src-all@freebsd.org Wed Jun 6 22:02:45 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 36617FE49A1; Wed, 6 Jun 2018 22:02:45 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E05AE692EE; Wed, 6 Jun 2018 22:02:44 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id C23AA10D11; Wed, 6 Jun 2018 22:02:44 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w56M2iD0072009; Wed, 6 Jun 2018 22:02:44 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w56M2ino072008; Wed, 6 Jun 2018 22:02:44 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201806062202.w56M2ino072008@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Wed, 6 Jun 2018 22:02:44 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r334740 - releng/11.2/sys/netinet X-SVN-Group: releng X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: releng/11.2/sys/netinet X-SVN-Commit-Revision: 334740 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Jun 2018 22:02:45 -0000 Author: tuexen Date: Wed Jun 6 22:02:44 2018 New Revision: 334740 URL: https://svnweb.freebsd.org/changeset/base/334740 Log: MFstable/11 334731 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. Approved by: re (gjb@) Sponsored by: Netflix, Inc. Modified: releng/11.2/sys/netinet/tcp_syncache.c Directory Properties: releng/11.2/ (props changed) Modified: releng/11.2/sys/netinet/tcp_syncache.c ============================================================================== --- releng/11.2/sys/netinet/tcp_syncache.c Wed Jun 6 22:02:20 2018 (r334739) +++ releng/11.2/sys/netinet/tcp_syncache.c Wed Jun 6 22:02:44 2018 (r334740) @@ -407,8 +407,14 @@ 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;