netdev - Re: Patch for tbench regression.

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Date:	Mon, 29 Sep 2008 10:01:29 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...vell.com>
Subject: Re: Patch for tbench regression.

Herbert Xu wrote:
> On Mon, Sep 29, 2008 at 03:02:13PM +0800, Herbert Xu wrote:
> 
>>OK you're on FV as well.  I'll try it on my laptaop next.
> 
> 
> Interesting.  On my laptop I'm seeing 113MB/s with TSO on and
> 119MB/s without.  However, netperf shows TSO on is slightly
> better than TSO off (4716Mb/s vs. 4680Mb/s).
> 
> A packet dump on tbench indicates it's sending lots of small
> packets so TSO wouldn't be contributing anything positive at
> all.  Hmm, it seems that even netperf isn't producing anything
> larger than MTU so something seems amiss with the TCP stack.

What is netperf reporting as its send "message" (misnomer) size? (I'm 
assuming this is a TCP_STREAM test rather than a TCP_RR or other test?)

rick jones
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