Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1

[Alan Cox]

On Mer, 2004-09-08 at 21:33, Mark_H_Johnson@xxxxxxxxxxxx wrote:
> >.... Please disable IDE DMA and see
> >what happens (after hiding the PIO IDE codepath via
> >touch_preempt_timing()).
> 
> Not quite sure where to add touch_preempt_timing() calls - somewhere in the
> loop in ide_outsl and ide_insl? [so we keep resetting the start /end
> times?]

If you haven't done hdparm -u1 that may be a reason you want to touch
these. To defend against some very bad old h/w where a stall in the I/O
stream to the disk causes corruption we disable IRQ's across the
transfer in PIO mode by default.

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