Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754084AbZLAKNQ (ORCPT ); Tue, 1 Dec 2009 05:13:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753982AbZLAKNQ (ORCPT ); Tue, 1 Dec 2009 05:13:16 -0500 Received: from casper.infradead.org ([85.118.1.10]:53955 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753851AbZLAKNP (ORCPT ); Tue, 1 Dec 2009 05:13:15 -0500 Date: Tue, 1 Dec 2009 02:14:59 -0800 From: Arjan van de Ven To: "Ma, Ling" Cc: Ingo Molnar , Dave Jones , "hpa@zytor.com" , "tglx@linutronix.de" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform Message-ID: <20091201021459.43d2142a@infradead.org> In-Reply-To: <8FED46E8A9CA574792FC7AACAC38FE7714FED213BE@PDSMSX501.ccr.corp.intel.com> References: <1259222752-8161-1-git-send-email-ling.ma@intel.com> <20091126094930.GD32275@elte.hu> <8FED46E8A9CA574792FC7AACAC38FE7714FED213BE@PDSMSX501.ccr.corp.intel.com> Organization: Intel X-Mailer: Claws Mail 3.7.3 (GTK+ 2.16.6; i586-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 820 Lines: 23 On Tue, 1 Dec 2009 16:54:04 +0800 "Ma, Ling" wrote: > Hi Ingo > > Thanks for your correction, so we use perf stat --repeat 3 to test > volano, tbench, and kbuild, Because netperf has multiple items we may > send out later. a key question is.. how much more memory do you have free due to -Os? (because memory is cache is performance on a system level as well) and how much less icache pressure is there? -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/