Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759667AbZD0UAb (ORCPT ); Mon, 27 Apr 2009 16:00:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757430AbZD0UAN (ORCPT ); Mon, 27 Apr 2009 16:00:13 -0400 Received: from ovro.ovro.caltech.edu ([192.100.16.2]:52146 "EHLO ovro.ovro.caltech.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750963AbZD0UAM (ORCPT ); Mon, 27 Apr 2009 16:00:12 -0400 Message-ID: <49F60EC9.2050501@ovro.caltech.edu> Date: Mon, 27 Apr 2009 13:00:09 -0700 From: David Hawkins User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: Kumar Gala CC: Ira Snyder , Liu Dave-R63238 , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, Dan Williams , Timur Tabi Subject: Re: [PATCH] fsldma: use PCI Read Multiple command References: <20090424183517.GB23140@ovro.caltech.edu> <49F608B7.9080409@ovro.caltech.edu> <49F60A3A.4060402@freescale.com> <49F60BF8.8040404@ovro.caltech.edu> <46B638E2-885C-4281-81EA-CB685264E143@kernel.crashing.org> In-Reply-To: <46B638E2-885C-4281-81EA-CB685264E143@kernel.crashing.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (ovro.ovro.caltech.edu); Mon, 27 Apr 2009 13:00:11 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1029 Lines: 28 >> Can you give me an example of non-PCI memory that would be >> non-prefetchable that you'd like us to try? We can see if our >> host CPUs have an area like that ... we just need to know >> what device to look for first :) > > You can mark the pci inbound window on the 83xx as non-prefetchable > (assuming 83xx is host). On a x86 host I doubt there is any easy way to > get non-prefetchable memory. Yep, we were going to do that, but chose to use the 1MB region already setup for the IMMRs since its already marked as non-prefetchable. We were only doing reads, so it wasn't going to hurt anything. I doubt that marking one of the other BAR regions as non-prefetchable will give a different result. However, we're more than happy to double-check if you'd like. Cheers, Dave -- 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/