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

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Hi Robert:

That might be because SuSE's compiled kernel doesn't use mce.  If you can look
in the .config for the compiled kernel (or you can ask one of the maintainers
for SuSE...or you're fortunate enough to have a /proc/config), I'd be curious
if it has MCE enabled (you'd be looking for "CONFIG_X86_MCE=y").  That would
nicely explain the discrepancy. 8)


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...
> Robert M. Hyatt, Ph.D.          Computer and Information Sciences
> hyatt@xxxxxxx                   University of Alabama at Birmingham
> (205) 934-2213                  136A Campbell Hall
> (205) 934-5473 FAX              Birmingham, AL 35294-1170
> 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.
> >>
> >>Suspecting it may be the SATA driver problem I mounted /tmp as "tmpfs"
> >>and repeated the tests entirely in /tmp (with plenty of RAM this means
> >>(IMHO) doing I/O in memory). No success.
> >>
> >>It is somewhat better when I run similar size no-I/O jobs but these also
> >>crash, although less frequently.
> >>
> >>I tried to install i386 version, also crashes. Same (or even worse) with
> >>FC3.
> >>
> >>Memtest does not show any RAM errors. 
> >>Finally I did two tests which seem to have excluded SATA
> >>controller/driver as the reason for crashes:
> >>
> >>1. I installed an additional IDE hard disk and put FC4/x86_64 system on
> >>it (without the Adaptec driver, so the system does not even see the SATA
> >>disks), updated the kernel to the latest (2.6.16) - also crashed.
> >>
> >>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.
> >>
> >>It seems there is a problem with SMP kernel and dual-core Opterons, at
> >>least on this hardware. I am stuck with three top-level machines which
> >>can work only at 25% of nominal cpu power. Any hints would be
> >>appreciated.
> >>
> >>
> >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.
> >
> >-- 
> >bill davidsen <davidsen@xxxxxxx>
> >CTO TMR Associates, Inc
> >Doing interesting things with small computers since 1979
> >
> >-
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