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| author |   Eric Dumazet <dada1@cosmosbay.com> | 2007-03-27 14:18:34 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:28:20 -0700 |
| commit | 03d4f879b9ddf7d5c1f788792247e62450342eed (patch) | |
| tree | ae5598e3309da4a6725f60ce7facf968849a7ab8 /net/ipv4/protocol.c | |
| parent | [TCP]: tcp_memory_pressure and tcp_socket are__read_mostly candidates (diff) | |
| download | linux-dev-03d4f879b9ddf7d5c1f788792247e62450342eed.tar.xz linux-dev-03d4f879b9ddf7d5c1f788792247e62450342eed.zip | |
[IPV4]: align inet_protos[] on SMP
As IPPROTO_TCP is 6, it makes sense to make sure inet_protos[] array
is properly cache line aligned to avoid false sharing on SMP.
c0680540 b peer_total
c0680544 b inet_peer_unused_head
c0680560 B inet_protos
On i386 this example, we can see that inet_protos[IPPROTO_TCP] shares
a potentially hot (and modified) cache line.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | net/ipv4/protocol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c index da70fef82c93..971ab9356e51 100644 --- a/net/ipv4/protocol.c +++ b/net/ipv4/protocol.c @@ -45,7 +45,7 @@ #include <net/ipip.h> #include <linux/igmp.h> -struct net_protocol *inet_protos[MAX_INET_PROTOS]; +struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp; static DEFINE_SPINLOCK(inet_proto_lock); /* |