Date: Tue, 6 Oct 2015 07:46:20 +0000 (UTC) From: Hiren Panchasara <hiren@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r288914 - head/sys/netinet Message-ID: <201510060746.t967kK9m046199@repo.freebsd.org>
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Author: hiren Date: Tue Oct 6 07:46:19 2015 New Revision: 288914 URL: https://svnweb.freebsd.org/changeset/base/288914 Log: Add a comment specifying how we implement rfc3042. Differential Revision: D3746 MFC after: 1 week Sponsored by: Limelight Networks Modified: head/sys/netinet/tcp_input.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Tue Oct 6 07:28:54 2015 (r288913) +++ head/sys/netinet/tcp_input.c Tue Oct 6 07:46:19 2015 (r288914) @@ -2536,6 +2536,16 @@ tcp_do_segment(struct mbuf *m, struct tc tp->snd_nxt = onxt; goto drop; } else if (V_tcp_do_rfc3042) { + /* + * Process first and second duplicate + * ACKs. Each indicates a segment + * leaving the network, creating room + * for more. Make sure we can send a + * packet on reception of each duplicate + * ACK by increasing snd_cwnd by one + * segment. Restore the original + * snd_cwnd after packet transmission. + */ cc_ack_received(tp, th, CC_DUPACK); u_long oldcwnd = tp->snd_cwnd; tcp_seq oldsndmax = tp->snd_max;
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