From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: No DMA on a Dell Latitude D820 with >2.6.20 Date: Sun, 27 Jan 2008 11:59:06 -0500 Message-ID: <479CB85A.5080803@rtr.ca> References: <1201450320.8386.7.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:3972 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752763AbYA0Q7J (ORCPT ); Sun, 27 Jan 2008 11:59:09 -0500 In-Reply-To: <1201450320.8386.7.camel@localhost> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mikel Olasagasti Cc: linux-ide@vger.kernel.org Mikel Olasagasti wrote: > Hi, > > I'm having problems with my disk on a Latitude D820 after upgrading > kernel to any >2.6.20 No DMA support can be activated, giving me a very > poor I/O performance. > > I'm using ata_piix driver on a ICH7 system with no AHCI support AFAIK .. Actually, no. You are really using the IDE driver ("hda") for your disk on the 2.6.23 kernel. You can fix this by just not including the IDE driver in your kernel build, and by fixing your /boot/grub/menu.lst file to use root=/dev/sda6 instead of root=/dev/hda6. Plus whatever special soup gentoo might require. Cheers > I opened a thread[1] on gentoo-forums (the distro I use) with all the > output i think can be interesting. > > Hope you can help me guys. Thanks for all :) > > [1] http://forums.gentoo.org/viewtopic-p-4731161.html