[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>
diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
index da70fef..971ab93 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);
/*