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Fix style and comment around concave/convex regions in TCP cubic.

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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)
Approved by:	tuexen (mentor), rgrimes (mentor)
MFC after:	2 weeks
Sponsored by:	NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D24657
This commit is contained in:
Richard Scheffenegger 2020-07-21 16:21:52 +00:00
parent f8f51b49d8
commit cce999b38f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363397
1 changed files with 2 additions and 3 deletions
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5
sys/netinet/cc/cc_cubic.c
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@ -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,