HDIO_SET_DMA failed on a Dell Latitude C400 Laptop

From: Mark Watts (m.watts_at_eris.qinetiq.com)
Date: 07/12/04

  • Next message: Lars Marowsky-Bree: "Re: [ANNOUNCE] Minneapolis Cluster Summit, July 29-30" 
    To: linux-kernel@vger.kernel.org
Date:	Mon, 12 Jul 2004 14:07:14 +0100

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    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

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