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Date:      Fri, 28 Dec 2001 18:10:09 +1030
From:      Greg Lehey <grog@lemis.com>
To:        FreeBSD Questions <questions@FreeBSD.org>, FreeBSD Hackers <hackers@freebsd.org>
Subject:   Does FreeBSD have a problem with some AMD processors?
Message-ID:  <20011228181009.F95692@monorchid.lemis.com>

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I've been using AMD processors almost exclusively in my main work
machines for over 4 years, and I've been very happy with them.  I'm
currently running a K6/233, a K6/333, an Athlon 750, a Duron 850 and
an Athlon XP 1700.  Last August, though, I bought a machine which gave
me a lot of trouble, the Duron 850 mentioned above.  I found that it
would freeze for no apparent reason.  I established that it wasn't the
memory by taking the memory of another machine and running it like
that; it made no difference.  I ended up also changing the motherboard
and the processor, but the hangs continued.   I could expect a hang
within 8 hours when doing 'make release'

Just for the fun of it, I tried running Linux on it.  I've been
running a kernel build and 'make clean' on it now for 36 hours, and
it's still running fine.  Yesterday some Linux friends of mine came
around and looked at it and told me that the Linux kernel I was
running on the machine (2.4.16) had had a number of AMD-specific fixes
put in.  He didn't go into more detail, unfortunately, but I'll ask
him again when I have time: it could be something relating to chipset
bugs we have seen and fixed.  It would help to know, though, if other
people are experiencing similar problems.  Please let me know if
you're having problems with AMD processors which seem to be specific
to FreeBSD, especially if they're hangs (i.e. the machine stops
reacting, but the display still shows the last state, it doesn't
reboot or panic).

Information that could be interesting is (here my values):

Processor:    AMD Duron 850
Motherboard:  ECS K7VZA
Memory:	      1 128 MB SIMM, 100 MHz.

Greg
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