From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 13 Oct 2010 08:22:03 +0000 (+0000)
Subject: fib: avoid false sharing on fib_table_hash
X-Git-Tag: v2.6.37-rc1~147^2~133
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10da66f7552b3c7966c2f4f1f72009fb0b5539ec;p=pandora-kernel.git

fib: avoid false sharing on fib_table_hash

While doing profile analysis, I found fib_hash_table was sometime in a
cache line shared by a possibly often written kernel structure.

(CONFIG_IP_ROUTE_MULTIPATH || !CONFIG_IPV6_MULTIPLE_TABLES)

It's hard to detect because not easily reproductible.

Make sure we allocate a full cache line to keep this shared in all cpus
caches.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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