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D43653.diff
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diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c
--- a/sys/netinet/tcp_sack.c
+++ b/sys/netinet/tcp_sack.c
@@ -953,8 +953,17 @@
/* Send one or 2 segments based on how much new data was acked. */
if ((BYTES_THIS_ACK(tp, th) / maxseg) >= 2)
num_segs = 2;
- tp->snd_cwnd = (tp->sackhint.sack_bytes_rexmit +
- (tp->snd_nxt - tp->snd_recover) + num_segs * maxseg);
+ if (V_tcp_do_newsack) {
+ tp->snd_cwnd = imax(tp->snd_nxt - th->th_ack +
+ tp->sackhint.sack_bytes_rexmit -
+ tp->sackhint.sacked_bytes -
+ tp->sackhint.lost_bytes, maxseg) +
+ num_segs * maxseg;
+ } else {
+ tp->snd_cwnd = (tp->sackhint.sack_bytes_rexmit +
+ imax(0, tp->snd_nxt - tp->snd_recover) +
+ num_segs * maxseg);
+ }
if (tp->snd_cwnd > tp->snd_ssthresh)
tp->snd_cwnd = tp->snd_ssthresh;
tp->t_flags |= TF_ACKNOW;
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D43653.diff (840 B)
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D43653: tcp: ensure tcp_sack_partialack does not inflate cwnd after RTO
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