Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932091AbVLXPxV (ORCPT ); Sat, 24 Dec 2005 10:53:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751246AbVLXPxV (ORCPT ); Sat, 24 Dec 2005 10:53:21 -0500 Received: from mail.dvmed.net ([216.237.124.58]:32966 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1751244AbVLXPxU (ORCPT ); Sat, 24 Dec 2005 10:53:20 -0500 Message-ID: <43AD6EE9.8080707@pobox.com> Date: Sat, 24 Dec 2005 10:53:13 -0500 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ed Sweetman CC: Linux Kernel Mailing List Subject: Re: pci-dma disables iommu on nforce4 motherboards? References: <43AD674F.1040008@comcast.net> In-Reply-To: <43AD674F.1040008@comcast.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.1 (/) X-Spam-Report: Spam detection software, running on the system "srv2.dvmed.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Ed Sweetman wrote: > I have an asus A8N-E motherboard and recieve the following message on boot. > PCI-DMA: Disabling IOMMU. > > I have no issues with anything not functioning. I guess i'm just > curious as to why this is done and if i'm missing out on any sort of > performance gain by not using the iommu. I have less than 4GB of ram, > would that be why it's disabled (which is why i think it is)? - [...] Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 RCVD_IN_SORBS_DUL RBL: SORBS: sent directly from dynamic IP address [69.134.188.146 listed in dnsbl.sorbs.net] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 710 Lines: 20 Ed Sweetman wrote: > I have an asus A8N-E motherboard and recieve the following message on boot. > PCI-DMA: Disabling IOMMU. > > I have no issues with anything not functioning. I guess i'm just > curious as to why this is done and if i'm missing out on any sort of > performance gain by not using the iommu. I have less than 4GB of ram, > would that be why it's disabled (which is why i think it is)? - What happens if you boot with iommu=force ? 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/