Re: FC4 crashes repeatedly on Supermicro AS1020A-T dual-core Opterons, SMP

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Bill Davidsen wrote:

Michal Szymanski wrote:

On Fri, May 05, 2006 at 10:18:36AM -0500, Robert M. Hyatt wrote:
One note. I am running on a quad 875 system, but am using Suse rather than FC4. It is running perfectly reliable (this is a 4 cpu, dual-core, 2.2ghz box, 8 processors total). I had problems with FC4 myself, although it runs perfectly on my normal dual xeon boxes...

On Fri, 5 May 2006, Bill Davidsen wrote:

Michal Szymanski wrote:

Hi all,

I have recently purchased three Supermicro AS1020A-T servers equipped
with two dual-core Opterons 280 each. H8DAR-T motherboards, 8 or 12 GB
RAM. The systems carry FC4 x86_64 with proprietary driver (made by
Adaptec) for the onboard Marvell 88SX6041 SATA Controller. Original
(install) kernel 2.6.11-1.1369_FC4smp - unfortunately not upgradable due
to the lack of the SATA driver for other kernel versions.

All systems crash (either hang with some "machine check exception"
kernel messages or reset) when loaded with repeating runs of 1.3gb, CPU intensive with some I/O. I run 2 or 4 jobs simultaneously and they had
never survived more than a few hours.
2. I ran non-SMP 2.6.11 kernel (with Adaptec driver) on another machine. There have been two test repeating 1.3g jobs running on it (each getting 50% of the single CPU used by the system) for over 50 hours now, no crashes. Also, a single test job running on SMP kernel gave no crashes in 24 hours.

What happens if you use only one CPU? Either with a uni kernel (you should have gotten one) or "maxcpus=1" in the boot commands. You are running a custom kernel with custom drivers, so you really should be asking the supplier, all we can do is suggest things which might provide extra information.

Hi all,

I got 3 copies of Roberts' message but none of Bill's :-)

Still, I don't quite understand Bill's question ("What happens if you
use only one CPU?"). The answer is quoted just above this question!
There were no crashes with the system running on non-SMP kernel.

It's a great answer, but not to my question. I wasn't asking what happens with a different kernel, but what happens when you run the SMP kernel and ==>use<== only one CPU by setting the max cpu to one. The uni kernel doesn't have a lot of code in an SMP kernel, so it haides a lot of possible questions.


Yes, I know my original question wasn't explicit on what I was asking, it's just the first thing I would have tried because I wouldn't have that uni kernel around.

bill davidsen <davidsen@xxxxxxx>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979

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