netdev - Re: [PATCH net-next] fib: avoid false sharing on fib_table

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Message-Id: <20101016.115610.48524281.davem@davemloft.net>
Date:	Sat, 16 Oct 2010 11:56:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] fib: avoid false sharing on fib_table_hash

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 13 Oct 2010 20:22:03 +0200

> 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@...il.com>

Applied.
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