From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Jones Subject: Re: Patch for tbench regression. Date: Mon, 29 Sep 2008 10:01:29 -0700 Message-ID: <48E109E9.9040103@hp.com> References: <20080928211530.GA9341@2ka.mipt.ru> <20080929031244.GA22619@gondor.apana.org.au> <20080929053605.GA21663@2ka.mipt.ru> <20080929054052.GA23600@gondor.apana.org.au> <20080929055203.GA3460@2ka.mipt.ru> <20080929064006.GA23967@gondor.apana.org.au> <20080929064518.GA10653@2ka.mipt.ru> <20080929070213.GA24146@gondor.apana.org.au> <20080929094352.GA25273@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: Evgeniy Polyakov , netdev@vger.kernel.org, Christoph Lameter , Mel Gorman , David Miller , Lennert Buytenhek To: Herbert Xu Return-path: Received: from g1t0026.austin.hp.com ([15.216.28.33]:23424 "EHLO g1t0026.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751258AbYI2RBh (ORCPT ); Mon, 29 Sep 2008 13:01:37 -0400 In-Reply-To: <20080929094352.GA25273@gondor.apana.org.au> Sender: netdev-owner@vger.kernel.org List-ID: 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