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Date:      Fri, 7 Jun 2002 21:36:22 -0700
From:      David Schultz <dschultz@uclink.Berkeley.EDU>
To:        Frank Mayhar <frank@exit.com>
Cc:        Alain Fauconnet <alain@cscoms.net>, freebsd-stable@FreeBSD.ORG
Subject:   Re: Numerous hard hangs on TWO different ASUS P4T-E w/P4 1.6G
Message-ID:  <20020607213622.A409@HAL9000.wox.org>
In-Reply-To: <200206072344.g57NiTwD033645@realtime.exit.com>; from frank@exit.com on Fri, Jun 07, 2002 at 04:44:29PM -0700
References:  <20020607143308.A1030@HAL9000.wox.org> <200206072344.g57NiTwD033645@realtime.exit.com>

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Thus spake Frank Mayhar <frank@exit.com>:
> David Schultz wrote:
> > Don't rule out hardware problems until you've tried a different model
> > motherboard.  Some old ASUS boards have a problem where, under intense
> > memory load, the voltage drops below the signalling threshhold and the
> > box locks up as you've described.  (ASUS won't readily admit to this
> > or any of the other bugs in their boards, but ask them why they did
> > the third revision to the P2B-F.)  That's just an example, but the
> > point is that both of your P4T-Es could have the same bug.
> 
> Well, considering that many different people are seeing this on different
> hardware (I have in fact seen it on two different motherboards, a Tyan
> Thunder 2500 with dual PIIIs and my current 2466N-4M with dual AMD MPs,
> different SCSI controllers, too), I think it must be some new bug in
> FreeBSD.  Perhaps in the interrupt handling?  I don't really know where
> to begin to look; if someone could suggest some places, that would be
> very useful.
> 
> So far, none of the various suggestions have made any difference at all.
> I have yet to turn off my IDE and parallel port to get IRQs back, I'll
> do that this weekend.

Ah, I see that later in the thread.  Ok, *now* you can rule out a
hardware problem.  My theory wouldn't have accounted for the temporary
lockups described later anyway.  The only time I have ever seen that
sort of thing is when transferring lots of data over a parallel port.

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