XCP: Crashes on dual Xeon HP ProLiant systems

["dwight at supercomputer.org" <dwight@supercomputer.org>]

Is anyone else running the latest XCP on HP ProLiant DL380 
systems? Or a similar dual Xeon 8-core system? I'm seeing 
spontaneous reboots when under a load.

Specifically, when 4 Windows HVMs are loaded, I haven't noticed
any reboots yet. But when running 7 or 8, the system will
reboot within minutes. Very little information appears on
the console.

I built a debugging version of the hypervisor, which changed
the behavior; the system managed to stay up for 2-3 hours
with 7 VMs running. However, it again spontaneously rebooted,
with no real messages on the console as to why.

I can send out the console log messages this evening, along
with the system information if there's interest. Alas, I
don't have access to these items at the moment.

I have also been running memtest86 overnight. As of 1.5 hours into
the test, there were no errors. But there are 48 GB of RAM
on the system, so the testing wasn't complete when I left.

Any suggestions here? I was going to build a 32-bit kernel
from the latest patches, but it appears Centos 5.4 Xen is 
also not stable on these systems. I had trouble getting
the kernel to build here, with various errors. The most
notable of which was:

----------------------
CC      arch/x86/kernel/acpi/processor.o
In file included from arch/x86/kernel/acpi/processor.c:8:
include/linux/kernel.h:185: internal compiler error: Segmentation 
fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
The bug is not reproducible, so it is likely a hardware or OS 
problem.
make[2]: *** [arch/x86/kernel/acpi/processor.o] Error 1
make[1]: *** [arch/x86/kernel/acpi] Error 2
make: *** [arch/x86/kernel] Error 2
----------------------

This was with a 64-bit Dom0 and a 32-bit Fedora 11 VM.

A 64-bit DomU works just fine. I know the stock XCP
kernel is 32-bits. Are there any issues running a 64-bit
XCP kernel, other than a slight degradation in speed?

    -dwight-