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net: Use a percpu_counter for orphan_count

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Instead of using one atomic_t per protocol, use a percpu_counter
for "orphan_count", to reduce cache line contention on
heavy duty network servers. 

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-11-25 21:17:14 -08:00 • committed by David S. Miller
parent 1748376b66
commit dd24c00191
8 changed files with 24 additions and 18 deletions
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2
net/ipv4/tcp_timer.c
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@ -65,7 +65,7 @@ static void tcp_write_err(struct sock *sk)
static int tcp_out_of_resources(struct sock *sk, int do_reset)
{
struct tcp_sock *tp = tcp_sk(sk);
int orphans = atomic_read(&tcp_orphan_count);
int orphans = percpu_counter_read_positive(&tcp_orphan_count);
/* If peer does not open window for long time, or did not transmit
* anything for long time, penalize it. */