From owner-freebsd-stable  Fri Dec 21  9:47:41 2001
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Date: Fri, 21 Dec 2001 18:46:52 +0100 (CET)
Subject: Re: 4.4-STABLE crashes - suspects new ata-driver over wd-drivers
From: "Kristian K. Nielsen" <jkkn@jkkn.dk>
To: <dillon@apollo.backplane.com>
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Cc: <bradym@mail.hydrologue.com>, <peter.jeremy@alcatel.com.au>,
	<davidc@acns.ab.ca>, <rnyberg@it.su.se>, <david@catwhisker.org>,
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Just my ten cents...

I have already tried to disable DMA, even in the BIOS and thereby forcing
PIO mode.... no difference in my case - it still crashes..

/Kristian

> :I'd had that thought as well. Seems a reasonably way for a misbehaving
> :driver to corrupt memory. I'll try that tonight.
> :
> :However, being a recent convert to BSD, I don't know how to turn of
> :DMA. How do I?
> :
> :--
> : Brady Montz
> : bradym@balestra.org
>
>    Do a 'man ata', there is a section on how to use sysctl to change
>    the mode.
>
>    I'm going to attempt to duplicate your tests on a SCSI box.  I did
>    do  a ktrace of portsdb and it appears to use the read() system call
>    to  read the Makefile's.  The only time 'pre-patch' shows up is in
>    medium-sized read() calls (574 bytes, 768 bytes, etc...).   Again,
>    nothing out of the ordinary.
>
>    It does do a lot of fork/exec's to run /bin/sh, objformat, test, and
>    other programs.  Beyond that, nothing out of the ordinary.
>
> 					-Matt
> 					Matthew Dillon
> 					<dillon@backplane.com>
>
>
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