From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266813AbUGLNLv (ORCPT ); Mon, 12 Jul 2004 09:11:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266815AbUGLNLv (ORCPT ); Mon, 12 Jul 2004 09:11:51 -0400 Received: from mail.eris.qinetiq.com ([128.98.1.1]:51736 "HELO mail.eris.qinetiq.com") by vger.kernel.org with SMTP id S266813AbUGLNLs convert rfc822-to-8bit (ORCPT ); Mon, 12 Jul 2004 09:11:48 -0400 From: Mark Watts Organization: QinetiQ To: linux-kernel@vger.kernel.org Subject: HDIO_SET_DMA failed on a Dell Latitude C400 Laptop Date: Mon, 12 Jul 2004 14:07:14 +0100 User-Agent: KMail/1.6.1 MIME-Version: 1.0 Content-Disposition: inline Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Message-Id: <200407121407.14428.m.watts@eris.qinetiq.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I've just burnt a cd for the first time on a Dell Latitude C400 laptop and I noticed that the system was quite sluggish while the burn was happening. (mouse pointer erratic, window redraw slow etc). Remembering a similar issue with a desktop system, I did the following to enable DMA on the hard drive (hdparm was giving ~3MB/sec read) # hdparm -c1 -d1 /dev/hda /dev/hda setting 32-bit IO_support flag to 1 setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted IO_support = 1 (32-bit) using_dma = 0 (off) hdparm now reports ~7MB/sec which is better but still prety poor. Any ideas why I couldn't set DMA on the drive? CPU = Mobile Pentum 3 @1.2GHz (800MHz when booted with no power cord) Ram = 256MB HDD = IBM Travelstar (IC25N020ATDA04-0) 20GB BIOS Rev = A12 - -- Mark Watts Senior Systems Engineer QinetiQ Trusted Information Management Trusted Solutions and Services group GPG Public Key ID: 455420ED -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFA8o0CBn4EFUVUIO0RAtrMAKCW7sohHS2muGZjJ8rqTEuCOMlD7wCfRB4T D+rI56ie5zpMtj/ed7Bz78g= =z33I -----END PGP SIGNATURE-----