Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751241AbVLXPUt (ORCPT ); Sat, 24 Dec 2005 10:20:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751242AbVLXPUt (ORCPT ); Sat, 24 Dec 2005 10:20:49 -0500 Received: from rwcrmhc14.comcast.net ([216.148.227.154]:65472 "EHLO rwcrmhc12.comcast.net") by vger.kernel.org with ESMTP id S1751241AbVLXPUs (ORCPT ); Sat, 24 Dec 2005 10:20:48 -0500 Message-ID: <43AD674F.1040008@comcast.net> Date: Sat, 24 Dec 2005 10:20:47 -0500 From: Ed Sweetman User-Agent: Debian Thunderbird 1.0.7 (X11/20051019) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linux Kernel Mailing List Subject: pci-dma disables iommu on nforce4 motherboards? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 624 Lines: 14 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)? - 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/