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;