Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751775AbXLIQ7V (ORCPT ); Sun, 9 Dec 2007 11:59:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750845AbXLIQ7M (ORCPT ); Sun, 9 Dec 2007 11:59:12 -0500 Received: from one.firstfloor.org ([213.235.205.2]:50342 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750767AbXLIQ7L (ORCPT ); Sun, 9 Dec 2007 11:59:11 -0500 Date: Sun, 9 Dec 2007 17:59:08 +0100 From: Andi Kleen To: Pavel Machek Cc: Alan Cox , 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: <20071209165908.GA15910@one.firstfloor.org> References: <475879CD.9080006@reed.com> <20071207160439.71b7f46a@the-village.bc.nu> <20071209125458.GB4381@ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071209125458.GB4381@ucw.cz> 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: 542 Lines: 13 > I mean, we expect 8usec delay -- historical ISA timing -- but when > _PCI_ card with leds is inserted, it is likely to be faster than old > ISA, right? Yes, i guess switching to udelay at least on newer systems would be a good idea. I'm not quite sure about systems without TSC though. -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/