From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265361AbTFFHFi (ORCPT ); Fri, 6 Jun 2003 03:05:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265365AbTFFHFi (ORCPT ); Fri, 6 Jun 2003 03:05:38 -0400 Received: from palrel13.hp.com ([156.153.255.238]:23523 "EHLO palrel13.hp.com") by vger.kernel.org with ESMTP id S265361AbTFFHFi (ORCPT ); Fri, 6 Jun 2003 03:05:38 -0400 From: David Mosberger MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16096.16492.286361.509747@napali.hpl.hp.com> Date: Fri, 6 Jun 2003 00:19:08 -0700 To: "David S. Miller" Cc: davidm@hpl.hp.com, manfred@colorfullife.com, axboe@suse.de, linux-kernel@vger.kernel.org Subject: Re: problem with blk_queue_bounce_limit() In-Reply-To: <20030605.235249.35666087.davem@redhat.com> References: <16094.58952.941468.221985@napali.hpl.hp.com> <1054797653.18294.1.camel@rth.ninka.net> <16096.14281.621282.67906@napali.hpl.hp.com> <20030605.235249.35666087.davem@redhat.com> X-Mailer: VM 7.07 under Emacs 21.2.1 Reply-To: davidm@hpl.hp.com X-URL: http://www.hpl.hp.com/personal/David_Mosberger/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>>>> On Thu, 05 Jun 2003 23:52:49 -0700 (PDT), "David S. Miller" said: David> you're not setting PCI_DMA_BUS_IS_PHYS properly. For IOMMU David> it should be set to zero. This tells the block layer if David> you're IOMMU or not. Ah, yes, thanks for pointing this out. PCI_DMA_BUS_IS_PHYS (and it's description) is quite misleading: it claims that it has something to do with there being an equivalence between PCI bus and physical addresses. That's actually the case for (small) ia64 platforms so that's why we ended up setting it to 1. --david