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SubjectRe: Limiting DMA speeds for individual IDE drives
On Tue, Sep 08, 2009 at 12:03:48PM -0400, Alan Stern wrote:
> Is there any simple way to force the old IDE driver to limit the DMA
> speed for a particular device?
>
> I've got a situation where a drive claims to be capable of supporting
> UDMA/100, but it's in a noisy environment and gets lots of errors at
> that speed. I'd like to limit it to UDMA/66 or even UDMA/33.
>
> The hdparm command should be able to do this but I can't run it until
> the system has booted, by which time a bunch of CRC and possibly other
> errors have already occurred. Ideally it should be possible to limit
> the speed starting as early as device detection, but I can't find any
> way to do it. Is there support for such a thing or will I have to hack
> it in?
Does passing ide=nodma at bootime, and then having init set the DMA at
the right speed, would work?

Regards,
Frederik


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