Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758259Ab0DHBDq (ORCPT ); Wed, 7 Apr 2010 21:03:46 -0400 Received: from mga09.intel.com ([134.134.136.24]:5386 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752875Ab0DHBDo (ORCPT ); Wed, 7 Apr 2010 21:03:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,166,1270450800"; d="scan'208";a="611147869" Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e From: "Zhang, Yanmin" To: Eric Dumazet Cc: Christoph Lameter , Pekka Enberg , netdev , Tejun Heo , alex.shi@intel.com, "linux-kernel@vger.kernel.org" , "Ma, Ling" , "Chen, Tim C" , Andrew Morton In-Reply-To: <1270665484.8141.47.camel@edumazet-laptop> References: <1269506457.4513.141.camel@alexs-hp.sh.intel.com> <1269570902.9614.92.camel@alexs-hp.sh.intel.com> <1270114166.2078.107.camel@ymzhang.sh.intel.com> <1270195589.2078.116.camel@ymzhang.sh.intel.com> <4BBA8DF9.8010409@kernel.org> <1270542497.2078.123.camel@ymzhang.sh.intel.com> <1270591841.2091.170.camel@edumazet-laptop> <1270607668.2078.259.camel@ymzhang.sh.intel.com> <4BBCB7B7.4040901@cs.helsinki.fi> <4BBCB868.2000705@cs.helsinki.fi> <1270665484.8141.47.camel@edumazet-laptop> Content-Type: text/plain; charset="ISO-8859-1" Date: Thu, 08 Apr 2010 09:05:47 +0800 Message-Id: <1270688747.2078.383.camel@ymzhang.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.28.0 (2.28.0-2.fc12) Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1090 Lines: 30 On Wed, 2010-04-07 at 20:38 +0200, Eric Dumazet wrote: > Le mercredi 07 avril 2010 ? 13:20 -0500, Christoph Lameter a ?crit : > > On Wed, 7 Apr 2010, Pekka Enberg wrote: > > > > > Oh, sorry, I think it's actually '____cacheline_aligned_in_smp' (with four > > > underscores) for per-cpu data. Confusing... > > > > This does not particulary help to clarify the situation since we are > > dealing with data that can either be allocated via the percpu allocator or > > be statically present (kmalloc bootstrap situation). > > > > -- > > Do we have a user program to check actual L1 cache size of a machine ? If there is no, it's easy to write it as kernel exports the cache stat by /sys/devices/system/cpu/cpuXXX/cache/indexXXX/ > > I remember my HP blades have many BIOS options, I would like to make > sure they are properly set. > > > -- 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/