Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754557AbXLKOR7 (ORCPT ); Tue, 11 Dec 2007 09:17:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752173AbXLKORw (ORCPT ); Tue, 11 Dec 2007 09:17:52 -0500 Received: from smtpq1.groni1.gr.home.nl ([213.51.130.200]:44238 "EHLO smtpq1.groni1.gr.home.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751832AbXLKORv (ORCPT ); Tue, 11 Dec 2007 09:17:51 -0500 Message-ID: <475E9B9B.2050709@keyaccess.nl> Date: Tue, 11 Dec 2007 15:15:55 +0100 From: Rene Herman User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Paul Rolland CC: David Newall , "H. Peter Anvin" , Krzysztof Halasa , Pavel Machek , Andi Kleen , Alan Cox , "David P. Reed" , linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , rol@witbe.net Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops References: <475879CD.9080006@reed.com> <20071207160439.71b7f46a@the-village.bc.nu> <20071209125458.GB4381@ucw.cz> <20071209165908.GA15910@one.firstfloor.org> <20071209212513.GC24284@elf.ucw.cz> <475CBDD7.5050602@keyaccess.nl> <475DE37F.20706@davidnewall.com> <475DE6F4.80702@zytor.com> <475DEB23.1000304@davidnewall.com> <20071211084059.3d03e11d@tux.DEF.witbe.net> <475E5D4B.8020101@keyaccess.nl> <475E7DC2.4060509@davidnewall.com> <475E8D91.20201@keyaccess.nl> <20071211143224.15900995@tux.DEF.witbe.net> In-Reply-To: <20071211143224.15900995@tux.DEF.witbe.net> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -1.0 (-) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 834 Lines: 22 On 11-12-07 14:32, Paul Rolland wrote: >> On 11-12-07 13:08, David Newall wrote: >> >>> Rene Herman wrote: > >> (*) some local testing shows it to be almost exactly that for both out and >> in on my own PC -- a little over. If anyone cares, see attached little test >> program. The "little over" I don't worry about. 0 us delay is also fine for >> me and if any code was _that_ fragile it would have broken long ago. > > Some results : Okay, these vary to wildly for you and might I suppose be a serialising artifact or some such. Give me a bit and I'll try to improve it... Rene -- 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/