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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
include/net/tcp.h
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@ -46,7 +46,7 @@
extern struct inet_hashinfo tcp_hashinfo;
extern atomic_t tcp_orphan_count;
extern struct percpu_counter tcp_orphan_count;
extern void tcp_time_wait(struct sock *sk, int state, int timeo);
#define MAX_TCP_HEADER (128 + MAX_HEADER)