Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751115AbVILBRT (ORCPT ); Sun, 11 Sep 2005 21:17:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751116AbVILBRT (ORCPT ); Sun, 11 Sep 2005 21:17:19 -0400 Received: from mail.dvmed.net ([216.237.124.58]:10650 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1751115AbVILBRT (ORCPT ); Sun, 11 Sep 2005 21:17:19 -0400 Message-ID: <4324D70C.3090109@pobox.com> Date: Sun, 11 Sep 2005 21:17:00 -0400 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.6-1.1.fc4 (X11/20050720) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Luck, Tony" CC: ak@suse.de, torvalds@osdl.org, Greg Edwards , linux-kernel@vger.kernel.org, discuss@x86-64.org Subject: Re: [2/3] Set compatibility flag for 4GB zone on IA64 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 855 Lines: 28 Luck, Tony wrote: >>Luck, Tony wrote: >> >>>ia64 isn't all that homogeneous. SGI systems stuff *all* memory >>>into the DMA zone as their I/O devices have no 32-bit limits (just >>>as well really as there is no memory below 4G on an Altix!). >> >>SGI machines support random PCI cards, right? If so, you >>cannot presume >>I/O devices have no 32-bit limits. > > > No, SGI machines don't support random PCI cards. The lowest > possible physical address in an Altix is 192GB. Cards that > can only DMA to addresses below 4G aren't going to be very > useful, are they? Do the boxes have IOMMUs? Jeff - 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/