netdev - Re: Patch for tbench regression.

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Message-ID: <20080929095126.GA25371@gondor.apana.org.au>
Date:	Mon, 29 Sep 2008 17:51:26 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	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.

On Mon, Sep 29, 2008 at 05:43:52PM +0800, Herbert Xu wrote:
> 
> 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.

It seems that netperf is issuing 16384-byte writes and as such
we're sending the packets out immediately so TSO doesn't get a
chance to merge the data.  Running netperf with -m 65536 makes
TSO beat non-TSO by 6293Mb/s to 4761Mb/s.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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