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Subject: Re: cerberus errors on 2.4.19 (ide dma related)
From: Ed Sweetman <safemode@speakeasy.net>
To: Andre Hedrick <andre@linux-ide.org>
Cc: linux-kernel@vger.kernel.org
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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.
> 

OK, that makes some sense, at least more than removing devfs.  I'll not
compile in preempt and test to see if the problem still occurs.   As
soon as i figure out how to not use devfs i'll try it without that too. 



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