Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754863AbXLKTQ1 (ORCPT ); Tue, 11 Dec 2007 14:16:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751446AbXLKTQU (ORCPT ); Tue, 11 Dec 2007 14:16:20 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:40068 "EHLO amd.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750785AbXLKTQT (ORCPT ); Tue, 11 Dec 2007 14:16:19 -0500 Date: Tue, 11 Dec 2007 20:16:49 +0100 From: Pavel Machek To: Rene Herman Cc: Andi Kleen , "linux-os (Dick Johnson)" , David Newall , Paul Rolland , "H. Peter Anvin" , Krzysztof Halasa , 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 Message-ID: <20071211191649.GB3437@elf.ucw.cz> References: <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> <475E95A3.3070801@davidnewall.com> <20071211163017.GD16750@one.firstfloor.org> <475EBFBA.6090301@keyaccess.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <475EBFBA.6090301@keyaccess.nl> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1219 Lines: 31 Hi! >> Anyways it looks like the discussion here is going in a >> a loop. I had hoped David would post his test results with >> another port so that we know for sure that the bus aborts (and not port >> 80) is the problem on his box. But it looks like >> he doesn't want to do this. Still removing the bus aborts >> is probably the correct way to go forward. > > Yes, I do also still want to know that. David (Reed)? > >> Only needs a patch now. If nobody beats me to it i'll >> add one later to my tree. > > Pavel Machek already posted one. His udelay(8) wants to be less -- 1 or "to > be safe" perhaps 2. > > http://lkml.org/lkml/2007/12/9/131 2 at least; that's how long outb(0x80) takes on one of my machines. Actually, ISA can go down to 4MHz, so maybe we should be using 4 usec.... but I guess I'm paranoid here. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/