From 90ba9b1986b5ac4b2d184575847147ea7c4280a2 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 3 Jun 2012 19:50:43 +0000 Subject: [PATCH] tcp: tcp_make_synack() can use alloc_skb() There is no value using sock_wmalloc() in tcp_make_synack(). A listener socket only sends SYNACK packets, they are not queued in a socket queue, only in Qdisc and device layers, so the number of in flight packets is limited in these layers. We used sock_wmalloc() with the %force parameter set to 1 to ignore socket limits anyway. This patch removes two atomic operations per SYNACK packet. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 803cbfe82fbc..f0b0e4414b00 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2461,7 +2461,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst, if (cvp != NULL && cvp->s_data_constant && cvp->s_data_desired) s_data_desired = cvp->s_data_desired; - skb = sock_wmalloc(sk, MAX_TCP_HEADER + 15 + s_data_desired, 1, GFP_ATOMIC); + skb = alloc_skb(MAX_TCP_HEADER + 15 + s_data_desired, GFP_ATOMIC); if (skb == NULL) return NULL; -- 2.30.2