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| author |   Eric Dumazet <edumazet@google.com> | 2016-05-02 10:56:27 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-05-03 16:02:36 -0400 |
| commit | 1d2077ac0165c0d173a2255e37cf4dc5033d92c7 (patch) | |
| tree | fc18bebb7e5ffe2109fd61c56230c5f47d5f313b /net/ipv4/tcp_output.c | |
| parent | Merge branch 'tipc-next' (diff) | |
| download | linux-dev-1d2077ac0165c0d173a2255e37cf4dc5033d92c7.tar.xz linux-dev-1d2077ac0165c0d173a2255e37cf4dc5033d92c7.zip | |
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/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 2 |
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); |