Date: Wed, 14 Oct 2015 05:29:33 +0000 (UTC) From: Hiren Panchasara <hiren@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r289288 - stable/10/sys/netinet Message-ID: <201510140529.t9E5TXPY018173@repo.freebsd.org>
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Author: hiren Date: Wed Oct 14 05:29:33 2015 New Revision: 289288 URL: https://svnweb.freebsd.org/changeset/base/289288 Log: MFC r288914 Add a comment specifying how we implement rfc3042. Modified: stable/10/sys/netinet/tcp_input.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/netinet/tcp_input.c ============================================================================== --- stable/10/sys/netinet/tcp_input.c Wed Oct 14 05:16:56 2015 (r289287) +++ stable/10/sys/netinet/tcp_input.c Wed Oct 14 05:29:33 2015 (r289288) @@ -2523,6 +2523,16 @@ 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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