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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
@@ -2579,8 +2579,11 @@
* estimate to be in the network.
*/
del_data = tp->sackhint.delivered_data;
- pipe = (tp->snd_nxt - tp->snd_fack) +
- tp->sackhint.sack_bytes_rexmit;
+ if (V_tcp_do_rfc6675_pipe)
+ pipe = tcp_compute_pipe(tp);
+ else
+ pipe = (tp->snd_nxt - tp->snd_fack) +
+ tp->sackhint.sack_bytes_rexmit;
tp->sackhint.prr_delivered += del_data;
if (pipe > tp->snd_ssthresh) {
if (tp->sackhint.recover_fs == 0)
@@ -3960,7 +3963,10 @@
if (SEQ_GEQ(th->th_ack, tp->snd_una))
del_data = BYTES_THIS_ACK(tp, th);
del_data += tp->sackhint.delivered_data;
- pipe = (tp->snd_nxt - tp->snd_fack) + tp->sackhint.sack_bytes_rexmit;
+ if (V_tcp_do_rfc6675_pipe)
+ pipe = tcp_compute_pipe(tp);
+ else
+ pipe = (tp->snd_nxt - tp->snd_fack) + tp->sackhint.sack_bytes_rexmit;
tp->sackhint.prr_delivered += del_data;
/*
* Proportional Rate Reduction

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