Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754658AbXLKBKj (ORCPT ); Mon, 10 Dec 2007 20:10:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752010AbXLKBKc (ORCPT ); Mon, 10 Dec 2007 20:10:32 -0500 Received: from hawking.rebel.net.au ([203.20.69.83]:37049 "EHLO hawking.rebel.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751935AbXLKBKb (ORCPT ); Mon, 10 Dec 2007 20:10:31 -0500 Message-ID: <475DE37F.20706@davidnewall.com> Date: Tue, 11 Dec 2007 11:40:23 +1030 From: David Newall User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070221 SeaMonkey/1.1.1 MIME-Version: 1.0 To: Krzysztof Halasa CC: Rene Herman , Pavel Machek , Andi Kleen , Alan Cox , "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> <20071207160439.71b7f46a@the-village.bc.nu> <20071209125458.GB4381@ucw.cz> <20071209165908.GA15910@one.firstfloor.org> <20071209212513.GC24284@elf.ucw.cz> <475CBDD7.5050602@keyaccess.nl> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 447 Lines: 8 Where did the 8us delay come from? The documentation and source is careful not to say how long the delay is. Would changing it to, say 1us, be technically wrong? Is code that requires 8us correct? -- 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/