Re: HDIO_SET_DMA failed on a Dell Latitude C400 Laptop

[Mark Watts]

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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

Kernel is a 2.6.7 kernel...

- -- 
Mark Watts
Senior Systems Engineer
QinetiQ Trusted Information Management
Trusted Solutions and Services group
GPG Public Key ID: 455420ED

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