Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756459Ab1CBJmt (ORCPT ); Wed, 2 Mar 2011 04:42:49 -0500 Received: from cantor.suse.de ([195.135.220.2]:50940 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756358Ab1CBJmr (ORCPT ); Wed, 2 Mar 2011 04:42:47 -0500 Date: Wed, 2 Mar 2011 10:42:46 +0100 From: Jan Kara To: Jeff Moyer Cc: Corrado Zoccolo , Jan Kara , "Alex,Shi" , "Li, Shaohua" , Vivek Goyal , "tytso@mit.edu" , "jaxboe@fusionio.com" , "linux-kernel@vger.kernel.org" , "Chen, Tim C" Subject: Re: [performance bug] kernel building regression on 64 LCPUs machine Message-ID: <20110302094246.GA7496@quack.suse.cz> References: <20110126081529.GA28909@sli10-conroe.sh.intel.com> <1297502512.29573.26.camel@debian> <1297650318.29573.2482.camel@debian> <1297732201.24560.2.camel@sli10-conroe> <20110221164909.GG6584@quack.suse.cz> <1298449487.14712.1064.camel@debian> <20110224121339.GE23042@quack.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1614 Lines: 36 On Tue 01-03-11 14:56:43, Jeff Moyer wrote: > Corrado Zoccolo writes: > > > On Thu, Feb 24, 2011 at 1:13 PM, Jan Kara wrote: > >> On Wed 23-02-11 16:24:47, Alex,Shi wrote: > >>> Though these patches can not totally recovered the problem, but they are > >>> quite helpful with ccache enabled situation. It increase 10% performance > >>> on 38-rc1 kernel. > >> ?OK and what was the original performance drop with WRITE_SYNC change? > >> > >>> I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here: > >>> with patches: > >> ?I'm attaching patches rebased on top of latest Linus's tree. > >> Corrado, could you possibly run your fsync-heavy tests so that we see > >> whether there isn't negative impact of my patches on your fsync-heavy > >> workload? Thanks. > > The workload was actually Jeff's, and the stalls that my change tried > > to mitigate showed up on his enterprise class storage. Adding him so > > he can test it. > > Sorry for the late reply. You can use either fs_mark or iozone to > generate an fsync-heavy workload. The test I did was to mix this with a > sequential reader. If you can point me at patches, I should be able to > test this. The latest version of patches is attached to: https://lkml.org/lkml/2011/2/24/125 Honza -- Jan Kara SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/