From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755473AbXLGPox (ORCPT ); Fri, 7 Dec 2007 10:44:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752974AbXLGPoq (ORCPT ); Fri, 7 Dec 2007 10:44:46 -0500 Received: from smtpq2.groni1.gr.home.nl ([213.51.130.201]:36703 "EHLO smtpq2.groni1.gr.home.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752926AbXLGPop (ORCPT ); Fri, 7 Dec 2007 10:44:45 -0500 Message-ID: <47596A2E.4060602@keyaccess.nl> Date: Fri, 07 Dec 2007 16:43:42 +0100 From: Rene Herman User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Andi Kleen CC: "David P. Reed" , linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops References: <475879CD.9080006@reed.com> <47595DB2.5080302@reed.com> <20071207145430.GA5992@one.firstfloor.org> In-Reply-To: <20071207145430.GA5992@one.firstfloor.org> 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 On 07-12-07 15:54, Andi Kleen wrote: >> My machine in question, for example, needs no waiting within CMOS_READs >> at all. And I doubt any other chip/device needs waiting that isn't > > I don't know about CMOS, but there were definitely some not too ancient > systems (let's say not more than 10 years) who required IO delays in the > floppy driver and the 8253/8259. But on those the jumps are already > far too fast. Also see Alan's replies in the thread I posted a link to: http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-09/5700.html Also 8254 (PIT) at least it seems. Rene.