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| author | Michael Tuexen <tuexen@FreeBSD.org> | 2019-05-09 07:11:08 +0000 |
|---|---|---|
| committer | Michael Tuexen <tuexen@FreeBSD.org> | 2019-05-09 07:11:08 +0000 |
| commit | 5cc11a89dbaa63dd0f56c28187b48fd1c48b6dbb (patch) | |
| tree | 0c6e26b8029b3379eec1d13215ad728747fb367d /sys/netinet/cc/cc_htcp.c | |
| parent | 6ca363eb7b1f240f5a15b6ca7d9fa6c3f0041024 (diff) | |
| download | src-5cc11a89dbaa63dd0f56c28187b48fd1c48b6dbb.tar.gz src-5cc11a89dbaa63dd0f56c28187b48fd1c48b6dbb.zip | |
Prevent cwnd to collapse down to 1 MSS after exiting recovery.
This is descrined in RFC 6582, which updates RFC 3782.
Submitted by: Richard Scheffenegger
Reviewed by: lstewart@
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D17614
Notes
Notes:
svn path=/head/; revision=347381
Diffstat (limited to 'sys/netinet/cc/cc_htcp.c')
| -rw-r--r-- | sys/netinet/cc/cc_htcp.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/netinet/cc/cc_htcp.c b/sys/netinet/cc/cc_htcp.c index 30962485a3e7..1686a4e5553a 100644 --- a/sys/netinet/cc/cc_htcp.c +++ b/sys/netinet/cc/cc_htcp.c @@ -366,7 +366,12 @@ htcp_post_recovery(struct cc_var *ccv) pipe = CCV(ccv, snd_max) - ccv->curack; if (pipe < CCV(ccv, snd_ssthresh)) - CCV(ccv, snd_cwnd) = pipe + CCV(ccv, t_maxseg); + /* + * Ensure that cwnd down not collape to 1 MSS under + * adverse conditions. Implements RFC6582 + */ + CCV(ccv, snd_cwnd) = max(pipe, CCV(ccv, t_maxseg)) + + CCV(ccv, t_maxseg); else CCV(ccv, snd_cwnd) = max(1, ((htcp_data->beta * htcp_data->prev_cwnd / CCV(ccv, t_maxseg)) |