Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752677AbZKISyb (ORCPT ); Mon, 9 Nov 2009 13:54:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751353AbZKISya (ORCPT ); Mon, 9 Nov 2009 13:54:30 -0500 Received: from one.firstfloor.org ([213.235.205.2]:58559 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750843AbZKISya (ORCPT ); Mon, 9 Nov 2009 13:54:30 -0500 Date: Mon, 9 Nov 2009 19:54:34 +0100 From: Andi Kleen To: "H. Peter Anvin" Cc: Andi Kleen , "Ma, Ling" , Ingo Molnar , Thomas Gleixner , linux-kernel Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string. Message-ID: <20091109185434.GH26740@basil.fritz.box> References: <1257500482-16182-1-git-send-email-ling.ma@intel.com> <4AF457E0.4040107@zytor.com> <4AF4784C.5090800@zytor.com> <8FED46E8A9CA574792FC7AACAC38FE7714FCF772C9@PDSMSX501.ccr.corp.intel.com> <4AF7C66C.6000009@zytor.com> <87ws2059s9.fsf@basil.nowhere.org> <4AF84640.7010705@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4AF84640.7010705@zytor.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 703 Lines: 18 > Ling's numbers didn't seem to show a significant slowdown on Core 2 (it > was something like 0.95x baseline in the worst case, and most of the > cases were positive) so Core 2 doesn't seem to have a problem. I ran quite a lot of micro benchmarks with various alignments and sizes the 'q' variant was not always a win. I haven't checked that particular version though. There's also K8 of course. -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/