Date: Sun, 28 Oct 2012 17:16:10 +0000 (UTC) From: Andre Oppermann <andre@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r242249 - head/sys/netinet Message-ID: <201210281716.q9SHGAss060275@svn.freebsd.org>
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Author: andre Date: Sun Oct 28 17:16:09 2012 New Revision: 242249 URL: http://svn.freebsd.org/changeset/base/242249 Log: Adjust the initial default CWND upon connection establishment to the new and increased values specified by RFC5681 Section 3.1. The even larger initial CWND per RFC3390, if enabled, is not affected. MFC after: 2 weeks Modified: head/sys/netinet/tcp_input.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Sun Oct 28 17:06:50 2012 (r242248) +++ head/sys/netinet/tcp_input.c Sun Oct 28 17:16:09 2012 (r242249) @@ -351,8 +351,15 @@ cc_conn_init(struct tcpcb *tp) if (V_tcp_do_rfc3390) tp->snd_cwnd = min(4 * tp->t_maxseg, max(2 * tp->t_maxseg, 4380)); - else - tp->snd_cwnd = tp->t_maxseg; + else { + /* Per RFC5681 Section 3.1 */ + if (tp->t_maxseg > 2190) + tp->snd_cwnd = 2 * tp->t_maxseg; + else if (tp->t_maxseg > 1095) + tp->snd_cwnd = 3 * tp->t_maxseg; + else + tp->snd_cwnd = 4 * tp->t_maxseg; + } if (CC_ALGO(tp)->conn_init != NULL) CC_ALGO(tp)->conn_init(tp->ccv);help
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