[Gllug] Poor disk performance - help

[Ashley Evans]

On Sunday 21 March 2004 23:02, Alain Williams wrote:
> On Sun, Mar 21, 2004 at 10:52:21PM +0000, Ashley Evans wrote:
> > First you could try checking if DMA is enabled, hdparm -d /dev/hda
> >
> > -d 1 will try to enable it.
> >
> > Most kernels come with the "use dma by default" turned on so if dma isn't
> > enabled you may find the kernel you're using doesn't support the chipset
> > of your motherboard fully. Look up the chipset on google and you're sure
> > to find out.
>
> Hmmm, yes - when I try to set '-d 1' it fails (HDIO_SET_DMA failed:
> Operation not permitted), if I try fiddling with -X xxx the kernel starts
> dereferencing NULL pointers.
>
> Off to google... thanks
>
> > Ashley
>
> --
> Alain Williams
>
> #include <std_disclaimer.h>
>
> FATHERS-4-JUSTICE - Campaigning for equal rights for parents and the
> best interests of our children. See http://www.fathers-4-justice.org

If you get the operation not permitted it is usually a good indication of 
missing kernel support.

Ashley
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