git: 2b43cd2ea26f - stable/13 - Improve PRR initial transmission timing

[Richard Scheffenegger]

The branch stable/13 has been updated by rscheff:

URL: https://cgit.FreeBSD.org/src/commit/?id=2b43cd2ea26f758d23e8c009cf7521c4ddec7353

commit 2b43cd2ea26f758d23e8c009cf7521c4ddec7353
Author:     Richard Scheffenegger <rscheff at FreeBSD.org>
AuthorDate: 2021-02-28 14:46:38 +0000
Commit:     Richard Scheffenegger <rscheff at FreeBSD.org>
CommitDate: 2021-03-03 07:12:49 +0000

    Improve PRR initial transmission timing
    
    Reviewed By:    tuexen, #transport
    MFC after:      3 days
    Sponsored by:   NetApp, Inc.
    Differential Revision:  https://reviews.freebsd.org/D28953
    
    (cherry picked from commit e9071000c9a04e3f685579500e24da9848944bb1)
---
 sys/netinet/tcp_input.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 1a4a4619c4bf..f7ef3ed81da2 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -2595,7 +2595,7 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
 							pipe = (tp->snd_nxt - tp->snd_fack) +
 								tp->sackhint.sack_bytes_rexmit;
 						tp->sackhint.prr_delivered += del_data;
-						if (pipe > tp->snd_ssthresh) {
+						if (pipe >= tp->snd_ssthresh) {
 							if (tp->sackhint.recover_fs == 0)
 								tp->sackhint.recover_fs =
 								    imax(1, tp->snd_nxt - tp->snd_una);
@@ -2695,7 +2695,8 @@ enter_recovery:
 						 * snd_ssthresh is already updated by
 						 * cc_cong_signal.
 						 */
-						tp->sackhint.prr_delivered = 0;
+						tp->sackhint.prr_delivered =
+						    tp->sackhint.sacked_bytes;
 						tp->sackhint.sack_bytes_rexmit = 0;
 						tp->sackhint.recover_fs = max(1,
 						    tp->snd_nxt - tp->snd_una);
@@ -3970,7 +3971,7 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th)
 	/*
 	 * Proportional Rate Reduction
 	 */
-	if (pipe > tp->snd_ssthresh) {
+	if (pipe >= tp->snd_ssthresh) {
 		if (tp->sackhint.recover_fs == 0)
 			tp->sackhint.recover_fs =
 			    imax(1, tp->snd_nxt - tp->snd_una);