Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759514AbZKFQv3 (ORCPT ); Fri, 6 Nov 2009 11:51:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759447AbZKFQv2 (ORCPT ); Fri, 6 Nov 2009 11:51:28 -0500 Received: from one.firstfloor.org ([213.235.205.2]:40718 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759442AbZKFQv2 (ORCPT ); Fri, 6 Nov 2009 11:51:28 -0500 To: ling.ma@intel.com Cc: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string. From: Andi Kleen References: <1257500482-16182-1-git-send-email-ling.ma@intel.com> Date: Fri, 06 Nov 2009 17:51:28 +0100 In-Reply-To: <1257500482-16182-1-git-send-email-ling.ma@intel.com> (ling ma's message of "Fri, 6 Nov 2009 17:41:22 +0800") Message-ID: <87my2z7g1b.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 535 Lines: 17 ling.ma@intel.com writes: > Intel Nehalem improves the performance of REP strings significantly > over previous microarchitectures in several ways: The problem is that it's not necessarily a win on older CPUs to do it this way. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/