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Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 83330a6cb242..12fda8f27b08 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4605,7 +4605,11 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
if (tcp_ooo_try_coalesce(sk, tp->ooo_last_skb,
skb, &fragstolen)) {
coalesce_done:
- tcp_grow_window(sk, skb);
+ /* For non sack flows, do not grow window to force DUPACK
+ * and trigger fast retransmit.
+ */
+ if (tcp_is_sack(tp))
+ tcp_grow_window(sk, skb);
kfree_skb_partial(skb, fragstolen);
skb = NULL;
goto add_sack;
@@ -4689,7 +4693,11 @@ add_sack:
tcp_sack_new_ofo_skb(sk, seq, end_seq);
end:
if (skb) {
- tcp_grow_window(sk, skb);
+ /* For non sack flows, do not grow window to force DUPACK
+ * and trigger fast retransmit.
+ */
+ if (tcp_is_sack(tp))
+ tcp_grow_window(sk, skb);
skb_condense(skb);
skb_set_owner_r(skb, sk);
}