Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754868Ab1BWIXv (ORCPT ); Wed, 23 Feb 2011 03:23:51 -0500 Received: from mga09.intel.com ([134.134.136.24]:46321 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754430Ab1BWIXu (ORCPT ); Wed, 23 Feb 2011 03:23:50 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.62,211,1297065600"; d="scan'208";a="712133913" Subject: Re: [performance bug] kernel building regression on 64 LCPUs machine From: "Alex,Shi" To: Jan Kara Cc: "Li, Shaohua" , Corrado Zoccolo , Vivek Goyal , "tytso@mit.edu" , "jaxboe@fusionio.com" , "linux-kernel@vger.kernel.org" , "Chen, Tim C" In-Reply-To: <20110221164909.GG6584@quack.suse.cz> 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> Content-Type: text/plain; charset="UTF-8" Date: Wed, 23 Feb 2011 16:24:47 +0800 Message-ID: <1298449487.14712.1064.camel@debian> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1117 Lines: 25 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. I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here: with patches: r b swpd free buff cache si so bi bo in cs us sy id wa st 1.5 24.7 0.0 64316199.8 17240.8 153376.9 0.0 0.0 1777.1 1788.0 6479.0 2605.3 1.7 0.9 89.1 8.2 0.0 original 38-rc1 kernel: 2.4 32.3 0.0 63653302.9 17170.6 153125.3 0.0 0.0 1579.7 1834.1 6016.4 2407.0 1.5 0.7 86.6 10.1 0.0 It reduce write blocks clearly. > > can you send a patch with both ext3 and ext4 changes? Our test shows > > your patch has positive effect, but need confirm with the ext3 change. > Sure. Patches for both ext3 & ext4 are attached. Sorry, it took me a > while to get to this. > > 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/