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[IPV4]: align inet_protos[] on SMP

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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>
This commit is contained in:
Eric Dumazet 2007-03-27 14:18:34 -07:00 committed by David S. Miller
parent 4103f8cd5c
commit 03d4f879b9
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/protocol.c
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@ -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);
/*