Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932160Ab1BYAwc (ORCPT ); Thu, 24 Feb 2011 19:52:32 -0500 Received: from mga09.intel.com ([134.134.136.24]:32202 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755320Ab1BYAwb (ORCPT ); Thu, 24 Feb 2011 19:52:31 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.62,221,1297065600"; d="scan'208";a="606336656" Message-ID: <4D66FB76.7040701@intel.com> Date: Fri, 25 Feb 2011 08:44:38 +0800 From: Alex Shi User-Agent: Thunderbird 2.0.0.24 (X11/20101027) MIME-Version: 1.0 To: Jan Kara CC: "Li, Shaohua" , Corrado Zoccolo , 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 References: <1295402148.4773.143.camel@debian> <1295402606.1949.871.camel@sli10-conroe> <20110120151656.GC18875@redhat.com> <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> In-Reply-To: <20110224121339.GE23042@quack.suse.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 974 Lines: 27 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? > The original drop is 30%. > >> 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. > > Honza > -- 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/