From 1d2077ac0165c0d173a2255e37cf4dc5033d92c7 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 2 May 2016 10:56:27 -0700 Subject: 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 Signed-off-by: David S. Miller --- net/core/sock.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'net/core/sock.c') diff --git a/net/core/sock.c b/net/core/sock.c index f615e9391170..08bf97eceeb3 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1655,6 +1655,17 @@ void sock_wfree(struct sk_buff *skb) } EXPORT_SYMBOL(sock_wfree); +/* This variant of sock_wfree() is used by TCP, + * since it sets SOCK_USE_WRITE_QUEUE. + */ +void __sock_wfree(struct sk_buff *skb) +{ + struct sock *sk = skb->sk; + + if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) + __sk_free(sk); +} + void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) { skb_orphan(skb); @@ -1677,8 +1688,21 @@ void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) } EXPORT_SYMBOL(skb_set_owner_w); +/* This helper is used by netem, as it can hold packets in its + * delay queue. We want to allow the owner socket to send more + * packets, as if they were already TX completed by a typical driver. + * But we also want to keep skb->sk set because some packet schedulers + * rely on it (sch_fq for example). So we set skb->truesize to a small + * amount (1) and decrease sk_wmem_alloc accordingly. + */ void skb_orphan_partial(struct sk_buff *skb) { + /* If this skb is a TCP pure ACK or already went here, + * we have nothing to do. 2 is already a very small truesize. + */ + if (skb->truesize <= 2) + return; + /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, * so we do not completely orphan skb, but transfert all * accounted bytes but one, to avoid unexpected reorders. -- cgit v1.2.3-59-g8ed1b