From owner-freebsd-stable@FreeBSD.ORG  Wed Oct 22 15:34:00 2003
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Date: Wed, 22 Oct 2003 15:33:59 -0700 (PDT)
From: Doug White <dwhite@gumbysoft.com>
To: Eugene Grosbein <eugen@kuzbass.ru>
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Subject: Re: kern/57174: 4.9-PRERELEASE panic: ata_dmasetup:
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On Wed, 22 Oct 2003, Eugene Grosbein wrote:

> dmitry@atlantis.dp.ua wrote:
> >
> > Hello!
> >
> >  I'm curious whether this issue would be critical for ANY ata(4)-system.
> > So (to the PR originator): Eugene, could you try your experiment with
> > tagged queueing turned off (hw.ata.tags=0)?
>
> I've tried. It does not panic with hw.ata.tags=0,
> glimpseindex took more than a hour to complete.
> This time CPU utilization was about 50% only
> and 'systat -vm 3' have shown 100% of hard drive usage.
>
> So Tagged Queueing may be guilty (again).

Why do you have ATA tagging turned on in the first place? It's known to
not work with 99% of the hardware out there; only a couple of models of
IBM drives having working tagging.

This is not turned on by default on purpose....

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org