Date: Wed, 28 Feb 2024 00:26:47 GMT From: Richard Scheffenegger <rscheff@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: e6e28a73fc21 - stable/13 - tcp: cubic - restart epoch after RTO Message-ID: <202402280026.41S0QlxD065313@gitrepo.freebsd.org>
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The branch stable/13 has been updated by rscheff: URL: https://cgit.FreeBSD.org/src/commit/?id=e6e28a73fc2149732b2dfc75d4a565e96b661018 commit e6e28a73fc2149732b2dfc75d4a565e96b661018 Author: Richard Scheffenegger <rscheff@FreeBSD.org> AuthorDate: 2024-02-24 16:07:25 +0000 Commit: Richard Scheffenegger <rscheff@FreeBSD.org> CommitDate: 2024-02-28 00:23:48 +0000 tcp: cubic - restart epoch after RTO This is a migitation to avoid sudden extreme jumps in cwnd, as t_epoch can be very out of date after an RTO. Per RFC9438, sec 4.8, t_epoch is to be reset whenever cwnd grows beyond ssthresh (CC phase transitions from slow start to congestion avoidance), to be fixed with the upcoming cc_cubic changes. MFC after: 3 days Reviewed By: cc, #transport Sponsored by: NetApp, Inc Differential Revision: https://reviews.freebsd.org/D44023 (cherry picked from commit 038699a8f18a0a651ee06b85fa1dbbee1eab56f1) --- sys/netinet/cc/cc_cubic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/netinet/cc/cc_cubic.c b/sys/netinet/cc/cc_cubic.c index 884778c13b2a..c2b465abd10d 100644 --- a/sys/netinet/cc/cc_cubic.c +++ b/sys/netinet/cc/cc_cubic.c @@ -155,6 +155,7 @@ cubic_ack_received(struct cc_var *ccv, uint16_t type) cubic_data->flags &= ~(CUBICFLAG_RTO_EVENT | CUBICFLAG_IN_SLOWSTART); cubic_data->max_cwnd = CCV(ccv, snd_cwnd); + cubic_data->t_last_cong = ticks; cubic_data->K = 0; } else if (cubic_data->flags & (CUBICFLAG_IN_SLOWSTART | CUBICFLAG_IN_APPLIMIT)) {
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