netdev - Re: [PATCH v2] ipv4: Early TCP socket demux.

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Message-Id: <20120619.231401.2278176068934152926.davem@davemloft.net>
Date:	Tue, 19 Jun 2012 23:14:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] ipv4: Early TCP socket demux.

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 20 Jun 2012 07:51:29 +0200

> On Wed, 2012-06-20 at 07:49 +0200, Eric Dumazet wrote:
> 
>> 2) small lived tcp sessions
>> 
>>    input dst is now dirtied because of the additional
>> dst_clone()/dst_release()
> 
> Not realy a concern because we dirty cache line anyway
> 
> dst_use_noref()
> {
> 	dst->__use++;
> 	dst->lastuse = time;
> }

Right, the costs probably even out for short TCP flows.

But better to do real tests than to believe what any of
us say. :-)

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