High CPU load on target host after migration

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Hi,

I have been toying around with kvm / libvirt / virt-manager and it's migration 
feature.
Both host machines are running a 2.6.33 Kernel.

One host is a Dual Quad Core Intel Xeon E5520  @ 2.27GHz and the other is a 
Dual Quad Core Intel E5420  @ 2.50GHz.

Migrating Linux machines works great but Windows XP SP3 is giving me a 
headache.
The migration process finishes without any crash/error but the CPU load on the 
target host is ~50% on two cores. There is no CPU intensive task running 
inside the VM though.
"Removing" the network card from the VM and migrating it between the two 
machines doesn't seem to trigger the high CPU load.
As network driver I tried the realtek and Red Hat virtio driver but it doesn't 
seem to make a difference.

Any insights on what could cause this situation and how to best debug it?

Cheers,

Thomas
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