D28780.diff
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	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -3990,8 +3990,8 @@
	* If there is going to be a SACK retransmission, adjust snd_cwnd
	* accordingly.
	*/
	- tp->snd_cwnd = tp->snd_nxt - tp->snd_recover +
	- tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg);
	+ tp->snd_cwnd = max(maxseg, (int64_t)tp->snd_nxt - tp->snd_recover +
	+ tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
	tp->t_flags \|= TF_ACKNOW;
	(void) tcp_output(tp);
	}