netdev - [PATCH net] tcp: set retransmit

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Date:	Sun, 11 May 2014 20:57:30 +0800
From:	Weiping Pan <panweiping3@...il.com>
To:	netdev@...r.kernel.org
Cc:	Weiping Pan <panweiping3@...il.com>
Subject: [PATCH net] tcp: set retransmit_high on loop exit

To save some CPU cycles slightly.

Signed-off-by: Weiping Pan <panweiping3@...il.com>
---
 net/ipv4/tcp_input.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d6b46eb..e431037 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1941,8 +1941,13 @@ void tcp_enter_loss(struct sock *sk, int how)
 	tcp_clear_all_retrans_hints(tp);
 
 	tcp_for_write_queue(skb, sk) {
-		if (skb == tcp_send_head(sk))
+		if (skb == tcp_send_head(sk)) {
+			if (skb != tcp_write_queue_head(sk)) {
+				skb = tcp_write_queue_prev(sk, skb);
+				tp->retransmit_high = TCP_SKB_CB(skb)->end_seq;
+			}
 			break;
+		}
 
 		if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
 			tp->undo_marker = 0;
@@ -1952,7 +1957,6 @@ void tcp_enter_loss(struct sock *sk, int how)
 			TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_ACKED;
 			TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
 			tp->lost_out += tcp_skb_pcount(skb);
-			tp->retransmit_high = TCP_SKB_CB(skb)->end_seq;
 		}
 	}
 	tcp_verify_left_out(tp);
-- 
1.9.0

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