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

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Message-ID: <4FE1F8A7.9000306@hp.com>
Date:	Wed, 20 Jun 2012 09:21:59 -0700
From:	Rick Jones <rick.jones2@...com>
To:	David Miller <davem@...emloft.net>
CC:	eric.dumazet@...il.com, shemminger@...tta.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] ipv4: Early TCP socket demux.

On 06/19/2012 11:14 PM, David Miller wrote:
> 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. :-)

netperf -c -C  -t TCP_CC ...  #just connect/close

or

netperf -c -C -t TCP_CRR ...  # with a request/response pair in there

For some definition of "real" anyway :)

rick jones
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