Dual Core problem with Linux-image-xen

Hi

I'm having problem with my AMD Athlon64 X2 3800+ and the
2.6.18-4-xen-vserver-amd64 kernel....
I installed my Etch with the standard 64bit 2.6.18-4 kernel and then
i installed the 2.6.18-4-xen-vserver-amd64. Then both cores on the
CPU where visible under /proc/cpuinfo and htop. And I setup Dom0 and
DomU's.
But due to other problems, i upgraded the BIOS on the Asus M2NPV-MX
motherboard. Now both cores is located, but not proper setup when
booting the xen kernel.

-------- 2.6.18-4-xen-vserver-amd64 --------
# dmesg | grep CPU
Initializing CPU#0
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
Brought up 2 CPUs
Initializing CPU#1

-------- 2.6.18-4-amd64 ------------------
# dmesg | grep CPU
SMP: Allowing 2 CPUs, 0 hotplug CPUs
Initializing CPU#0
CPU 0: aperture @ d030000000 size 32 MB
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU 0/0 -> Node 0
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
Initializing CPU#1
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU 1/1 -> Node 0
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
CPU 1: Syncing TSC to CPU 0.
CPU 1: synchronized TSC with CPU 0 (last diff 0 cycles, maxerr 482
cycles)
Brought up 2 CPUs
---------------------------------------------

I have looked at xen boot options, but that didn't change the outcome.

/Lars


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