netdev - Re: [PATCH] NET : keep sk_backlog near sk

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Message-Id: <20070304.160557.63128876.davem@davemloft.net>
Date:	Sun, 04 Mar 2007 16:05:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] NET : keep sk_backlog near sk_lock

From: Eric Dumazet <dada1@...mosbay.com>
Date: Thu, 22 Feb 2007 15:50:15 +0100

> sk_backlog is a critical field of struct sock. (known famous words)
> 
> It is (ab)used in hot paths, in particular in release_sock(), tcp_recvmsg(), 
> tcp_v4_rcv(), sk_receive_skb().
> 
> It really makes sense to place it next to sk_lock, because sk_backlog is only 
> used after sk_lock locked (and thus memory cache line in L1 cache). This 
> should reduce cache misses and sk_lock acquisition time.
> 
> (In theory, we could only move the head pointer near sk_lock, and leaving tail 
> far away, because 'tail' is normally not so hot, but keep it simple :) )
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Applied, thanks a lot Eric.
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