netdev - Re: [PATCH] af_packet: Avoid cache line dirtying

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Message-Id: <20091020.010753.129086177.davem@davemloft.net>
Date:	Tue, 20 Oct 2009 01:07:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, deri@...p.org
Subject: Re: [PATCH] af_packet: Avoid cache line dirtying

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 16 Oct 2009 16:02:20 +0200

> While doing multiple captures, I found af_packet was dirtying cache line
> containing its prot_hook.
> 
> This slow down machines where several cpus are necessary to handle capture
> traffic, as each prot_hook is traversed for each packet coming in or out
> the host.
> 
> This patches moves "struct packet_type prot_hook" to the end of 
> packet_sock, and uses a ____cacheline_aligned_in_smp to make sure
> this remains shared by all cpus.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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