From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267517AbUBTETe (ORCPT ); Thu, 19 Feb 2004 23:19:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267521AbUBTETe (ORCPT ); Thu, 19 Feb 2004 23:19:34 -0500 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:6830 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S267517AbUBTETb (ORCPT ); Thu, 19 Feb 2004 23:19:31 -0500 Message-ID: <40358AC5.90103@pobox.com> Date: Thu, 19 Feb 2004 23:19:17 -0500 From: Jeff Garzik User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030703 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Bill Davidsen CC: David Mosberger-Tang , Linux Kernel Mailing List Subject: Re: [PATCH] Intel x86-64 support merge References: <1qK5k-7g2-67@gated-at.bofh.it> <1qK5k-7g2-69@gated-at.bofh.it> <1qK5k-7g2-71@gated-at.bofh.it> <1qK5k-7g2-73@gated-at.bofh.it> <1qK5k-7g2-65@gated-at.bofh.it> <40353382.8010505@tmr.com> In-Reply-To: <40353382.8010505@tmr.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bill Davidsen wrote: > David Mosberger-Tang wrote: > >>>>>>> On Thu, 19 Feb 2004 00:40:24 +0100, Arjan van de Ven >>>>>>> said: >> >> >> >> Arjan> On Wed, 2004-02-18 at 23:57, H. Peter Anvin wrote: >> >> Because they were caught by surprise and just hacked the chips >> >> they had in the pipeline, presumably. >> >> Arjan> fair enough; I hope this means the next generation has this >> Arjan> wart fixed... >> >> I wouldn't hold my breath. My impression was that the Intel chipset >> folks don't want I/O MMU because (a) Windows doesn't need it and (b) >> real machines use (close-to-)64-bit-capable hardware. > > > Doesn't need it? Does that mean the Win64 uses bounce buffers for > everything? Or am I totally misreading this? Well, for 32-bit PCI hardware on a 64-bit OS, you pretty much have to bounce, without an IOMMU. I doubt Win64 bounces for 64-bit PCI hardware, but who knows... Jeff