From df95e230300d297fb561cc768dff7c36b51c8fea Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Fri, 27 Apr 2012 16:15:55 +0800
Subject: [PATCH] tcp: Update snd_last upon spurious timeout retransmission
 restore

According to RFC4015; mainly to avoid delay spike.
---
 sys/netinet/tcp_timer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c
index a54a43c3e5..8f1f98a07d 100644
--- a/sys/netinet/tcp_timer.c
+++ b/sys/netinet/tcp_timer.c
@@ -483,8 +483,10 @@ tcp_revert_congestion_state(struct tcpcb *tp)
 		++tcpstat.tcps_sndfastrexmitbad;
 		if (tp->t_flags & TF_EARLYREXMT)
 			++tcpstat.tcps_sndearlyrexmitbad;
-	} else
+	} else {
 		++tcpstat.tcps_sndrtobad;
+		tp->snd_last = ticks;
+	}
 	tp->t_badrxtwin = 0;
 	tp->t_rxtshift = 0;
 	tp->snd_nxt = tp->snd_max;
-- 
2.41.0