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net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames()

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We can reduce pressure on dst entry refcount that slowdown UDP transmit
path on SMP machines. This pressure is visible on RTP servers when
delivering content to mediagateways, especially big ones, handling
thousand of streams. Several cpus send UDP frames to the same
destination, hence use the same dst entry.

This patch makes ip_push_pending_frames() steal the refcount its
callers had to take when filling inet->cork.dst.

This doesnt avoid all refcounting, but still gives speedups on SMP,
on UDP/RAW transmit path.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-11-24 16:07:50 -08:00 committed by David S. Miller
parent 2e77d89b2f
commit a21bba9454
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/ip_output.c
View file

@ -1284,7 +1284,12 @@ int ip_push_pending_frames(struct sock *sk)
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
skb->dst = dst_clone(&rt->u.dst);
/*
* Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec
* on dst refcount
*/
inet->cork.dst = NULL;
skb->dst = &rt->u.dst;
if (iph->protocol == IPPROTO_ICMP)
icmp_out_count(net, ((struct icmphdr *)