Re: slows to a crawl when hard drive is in use

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

>Don't touch the timings. ide-pmac will setup proper timings depending
>on the drive and the controller revision. If you think someting is
>wrong, then send me what dmesg says along with a tarball of your
>/proc/device-tree
>
>On the other hand, it's perfectly safe (and recommended) to enable
>unmasking of irqs.
>
>I doubt 32 bits IOs will have any effect (I'm not sure it's properly
>supported by the HW; but you shouldn't care with DMA anyway).

I confirm, stay away from 32 bits IOs.

Another setting that may help giving you better performances or at least
better responsiveness during transfers is to set the drive multisector
count. I typically use hdparm -m 16 /dev/hda

Ben.



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