From owner-freebsd-stable  Thu Dec 20 15:33:49 2001
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Date: Thu, 20 Dec 2001 15:33:35 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
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To: Brady Montz <bradym@mail.hydrologue.com>
Cc: Peter Jeremy <peter.jeremy@alcatel.com.au>,
	Chad David <davidc@acns.ab.ca>, Richard Nyberg <rnyberg@it.su.se>,
	David Wolfskill <david@catwhisker.org>, freebsd-stable@FreeBSD.ORG
Subject: Re: 4.4-STABLE crashes - suspects new ata-driver over wd-drivers
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: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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