Quote Originally Posted by berndgsflinux View Post
Finally, half a year later, i found the culprit. I used a virtio network adapter in the vm. Although you read everywhere that paravirtualized hardware is faster than ones which have to be completely emulated. But it's not true in my case. I used e1000 as network adapter in the VMM, and now the system is running fine, with nearly zero si. Very interesting.

Normally a paravirtual nic should be faster and more efficient but that is not to say that there might be a bug in the driver. SLES 10 is very old and bug fixes may not have been ported back to that release.

I'm glad you found a workaround with the E1000 adapter. If you ever decide to upgrade this server, be sure to try the paravirtual nic and see if the issue has been resolved.