From: Ric Wheeler Subject: Re: jbd/jbd2 performance improvements Date: Thu, 16 Oct 2008 08:06:55 -0400 Message-ID: <48F72E5F.2050409@redhat.com> References: <48F62893.9060606@redhat.com> <18678.55651.556822.187508@frecb006361.adech.frec.bull.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "Theodore Ts'o" , linux-ext4@vger.kernel.org, Eric Sandeen To: Solofo.Ramangalahy@bull.net Return-path: Received: from mx2.redhat.com ([66.187.237.31]:57667 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752959AbYJPMHt (ORCPT ); Thu, 16 Oct 2008 08:07:49 -0400 In-Reply-To: <18678.55651.556822.187508@frecb006361.adech.frec.bull.fr> Sender: linux-ext4-owner@vger.kernel.org List-ID: Solofo.Ramangalahy@bull.net wrote: > Hi Ric, > > >>>>>> On Wed, 15 Oct 2008 13:29:55 -0400, Ric Wheeler said: >>>>>> > Ric> We are going to try and poke at this - do you suspect a single or > Ric> multi-threaded test would work best? > > I've performed some tests: > http://www.bullopensource.org/ext4/20081013-2.6.27-rc9-ext4-1-akpm-fix-run6/ > http://www.bullopensource.org/ext4/20081013-2.6.27-rc9-ext4-1-akpm-fix-run6/results_sorted.txt.html > > I now realize that the results may not be valid since I used kvm, but > they do show variation wrt. the number of threads. > > So you may want to test both single and multi-threaded. > > A very thorough test, but the results don't seem to point to a consistent winner. I agree that running without KVM in the picture might be very interesting. Eric has some similar tests underway, I think that his results were also inconclusive so far... Ric