Date: Thu, 20 Dec 2001 15:33:35 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> 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 Message-ID: <200112202333.fBKNXZ679605@apollo.backplane.com> References: <200112172133.fBHLXJg39627@bunrab.catwhisker.org> <20011217144541.A45973@colnta.acns.ab.ca> <20011218094330.A10601@gromit.it.su.se> <200112180857.fBI8vNh68173@apollo.backplane.com> <20011218023630.A5190@ranger.acns.ab.ca> <200112181920.fBIJKRt70523@apollo.backplane.com> <200112190757.fBJ7veY02579@mail.hydrologue.com> <200112190732.fBJ7WFQ86868@apollo.backplane.com> <87u1ulq1a8.fsf@balestra.org> <200112202147.fBKLlGg78745@apollo.backplane.com> <20011221094727.F73243@gsmx07.alcatel.com.au> <200112210400.fBL40O009107@mail.hydrologue.com> <200112202259.fBKMxGi79320@apollo.backplane.com> <200112210425.fBL4Pnk09252@mail.hydrologue.com>
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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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