From: David S. Miller <davem@davemloft.net>
Date: Tue, 5 Jul 2005 22:43:58 +0000 (-0700)
Subject: [TCP]: Never TSO defer under periods of congestion.
X-Git-Tag: v2.6.13-rc2~6^2~1
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=908a75c17a9e5a888347c2c1d3572203d1b1c7db;p=linux-2.6

[TCP]: Never TSO defer under periods of congestion.

Congestion window recover after loss depends upon the fact
that if we have a full MSS sized frame at the head of the
send queue, we will send it.  TSO deferral can defeat the
ACK clocking necessary to exit cleanly from recovery.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index fd3ce38184..e041d057ec 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -909,6 +909,9 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
 	if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
 		return 0;
 
+	if (tp->ca_state != TCP_CA_Open)
+		return 0;
+
 	in_flight = tcp_packets_in_flight(tp);
 
 	BUG_ON(tcp_skb_pcount(skb) <= 1 ||