D28972.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
	@@ -2786,6 +2786,16 @@
	tcp_newreno_partial_ack(tp, th);
	} else
	cc_post_recovery(tp, th);
	+ } else if (IN_CONGRECOVERY(tp->t_flags)) {
	+ if (SEQ_LT(th->th_ack, tp->snd_recover)) {
	+ if (V_tcp_do_prr) {
	+ tp->sackhint.delivered_data = BYTES_THIS_ACK(tp, th);
	+ tp->snd_fack = th->th_ack;
	+ tcp_do_prr_ack(tp, th);
	+ (void) tcp_output(tp);
	+ }
	+ } else
	+ cc_post_recovery(tp, th);
	}
	/*
	* If we reach this point, ACK is not a duplicate,
	@@ -3954,8 +3964,12 @@
	* If there is going to be a SACK retransmission, adjust snd_cwnd
	* accordingly.
	*/
	- tp->snd_cwnd = imax(maxseg, tp->snd_nxt - tp->snd_recover +
	- tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
	+ if (IN_FASTRECOVERY(tp->t_flags)) {
	+ tp->snd_cwnd = imax(maxseg, tp->snd_nxt - tp->snd_recover +
	+ tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
	+ } else if (IN_CONGRECOVERY(tp->t_flags))
	+ tp->snd_cwnd = imax(maxseg, pipe - del_data +
	+ (snd_cnt * maxseg));
	}

	/*