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tcp: cubic - restart epoch after RTO

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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cwnd, as t_epoch can be very out of date after an RTO.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
This commit is contained in:
Richard Scheffenegger 2024-02-24 17:07:25 +01:00
parent 40fdc6d25f
commit 038699a8f1
1 changed files with 1 additions and 0 deletions
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sys/netinet/cc/cc_cubic.c
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@ -270,6 +270,7 @@ cubic_ack_received(struct cc_var *ccv, ccsignal_t type)
cubic_data->flags &= ~(CUBICFLAG_RTO_EVENT |
CUBICFLAG_IN_SLOWSTART);
cubic_data->W_max = CCV(ccv, snd_cwnd);
cubic_data->t_epoch = ticks;
cubic_data->K = 0;
} else if (cubic_data->flags & (CUBICFLAG_IN_SLOWSTART |
CUBICFLAG_IN_APPLIMIT)) {