Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756279AbZLCPDP (ORCPT ); Thu, 3 Dec 2009 10:03:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756197AbZLCPDO (ORCPT ); Thu, 3 Dec 2009 10:03:14 -0500 Received: from mga02.intel.com ([134.134.136.20]:27768 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756238AbZLCPDO convert rfc822-to-8bit (ORCPT ); Thu, 3 Dec 2009 10:03:14 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.47,335,1257148800"; d="scan'208";a="575336765" From: "Ma, Ling" To: Arjan van de Ven CC: Ingo Molnar , Dave Jones , "hpa@zytor.com" , "tglx@linutronix.de" , "linux-kernel@vger.kernel.org" Date: Thu, 3 Dec 2009 23:03:15 +0800 Subject: RE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform Thread-Topic: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform Thread-Index: Acpybt6zMpQxUWWgS62glBvsAEJUkQBucmPQ Message-ID: <8FED46E8A9CA574792FC7AACAC38FE7714FF5709D9@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> <20091201021459.43d2142a@infradead.org> In-Reply-To: <20091201021459.43d2142a@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 596 Lines: 14 > 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) The kernel code size from Os is 12M, that from O2 is 14M. > and how much less icache pressure is there? >From perf stat report, cache reference(unified cache) from O2 is almost the same with Os. Thanks Ling -- 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/