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authorEric Dumazet <edumazet@google.com>2016-05-02 20:56:27 +0300
committerDavid S. Miller <davem@davemloft.net>2016-05-03 23:02:36 +0300
commit1d2077ac0165c0d173a2255e37cf4dc5033d92c7 (patch)
treefc18bebb7e5ffe2109fd61c56230c5f47d5f313b /net/ipv4
parente34b1638d02bef8c3278af30ee73077c5babc082 (diff)
downloadlinux-1d2077ac0165c0d173a2255e37cf4dc5033d92c7.tar.xz
net: add __sock_wfree() helper
Hosts sending lot of ACK packets exhibit high sock_wfree() cost because of cache line miss to test SOCK_USE_WRITE_QUEUE We could move this flag close to sk_wmem_alloc but it is better to perform the atomic_sub_and_test() on a clean cache line, as it avoid one extra bus transaction. skb_orphan_partial() can also have a fast track for packets that either are TCP acks, or already went through another skb_orphan_partial() Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 25d527922b18..8daefd8b1b49 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -949,7 +949,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
skb_orphan(skb);
skb->sk = sk;
- skb->destructor = skb_is_tcp_pure_ack(skb) ? sock_wfree : tcp_wfree;
+ skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree;
skb_set_hash_from_sk(skb, sk);
atomic_add(skb->truesize, &sk->sk_wmem_alloc);