Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756181AbXLGQb1 (ORCPT ); Fri, 7 Dec 2007 11:31:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753091AbXLGQbU (ORCPT ); Fri, 7 Dec 2007 11:31:20 -0500 Received: from one.firstfloor.org ([213.235.205.2]:58561 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753085AbXLGQbT (ORCPT ); Fri, 7 Dec 2007 11:31:19 -0500 Date: Fri, 7 Dec 2007 17:31:16 +0100 From: Andi Kleen To: Alan Cox Cc: Andi Kleen , "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 Message-ID: <20071207163116.GB5992@one.firstfloor.org> References: <475879CD.9080006@reed.com> <20071207160439.71b7f46a@the-village.bc.nu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071207160439.71b7f46a@the-village.bc.nu> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 519 Lines: 12 > You don't need to. Port 0x80 historically is about 8uS so just udelay(8) > and make sure the initial default delay is conservative enough before the How would you make it conservative enough handling let's say a 6Ghz CPU that can execute multiple jumps per cycle? -Andi -- 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/