Date: Wed, 19 Aug 2020 10:40:02 +0000 (UTC) From: Richard Scheffenegger <rscheff@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r364378 - stable/12/sys/netinet/cc Message-ID: <202008191040.07JAe2x1052224@repo.freebsd.org>
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Author: rscheff Date: Wed Aug 19 10:40:02 2020 New Revision: 364378 URL: https://svnweb.freebsd.org/changeset/base/364378 Log: MFC r363397: Fix style and comment around concave/convex regions in TCP cubic. In cubic, the concave region is when snd_cwnd starts growing slower towards max_cwnd (cwnd at the time of the congestion event), and the convex region is when snd_cwnd starts to grow faster and eventually appearing like slow-start like growth. PR: 238478 Reviewed by: tuexen (mentor), rgrimes (mentor) Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D24657 Modified: stable/12/sys/netinet/cc/cc_cubic.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/cc/cc_cubic.c ============================================================================== --- stable/12/sys/netinet/cc/cc_cubic.c Wed Aug 19 10:36:16 2020 (r364377) +++ stable/12/sys/netinet/cc/cc_cubic.c Wed Aug 19 10:40:02 2020 (r364378) @@ -185,12 +185,11 @@ cubic_ack_received(struct cc_var *ccv, uint16_t type) */ if (CCV(ccv, snd_cwnd) < w_tf) CCV(ccv, snd_cwnd) = ulmin(w_tf, INT_MAX); - } - - else if (CCV(ccv, snd_cwnd) < w_cubic_next) { + } else if (CCV(ccv, snd_cwnd) < w_cubic_next) { /* * Concave or convex region, follow CUBIC * cwnd growth. + * Only update snd_cwnd, if it doesn't shrink. */ if (V_tcp_do_rfc3465) CCV(ccv, snd_cwnd) = ulmin(w_cubic_next,
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