Re: cerberus errors on 2.4.19 (ide dma related)

From: Ed Sweetman (
Date: Sun Aug 18 2002 - 13:31:30 EST

Preempt doesn't seem to be the culprit. Reran the test without using
preempt and I got MEMORY errors within 22 seconds at udma2. So preempt
is not the problem here.

On Sun, 2002-08-18 at 05:19, Andre Hedrick wrote:
> 2.4.19-preempt
> All bets are off because who knows what preempt is doing to the state
> machines and in PIO you are dead.
> You can not delay transaction of data between interrupts w/o having the
> transport help out. But the preempt don't get it.
> If you push your request size down to 8k or to a page you preempt problems
> will go away, only because granularity of requests. And the price is
> performance goes in the tank. But this is preempt so who cares.

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