VM CPU issue?

[KNardi]

ESX Vsphere

I have many VM's on VSphere and recently noticed that the VM's that have 1 CPU show MULTIPROCESSOR in Device manager/Computer.

Is this normal or something I should be concerned with?

Is there any HAL or overhead that will cause issues?

thanks for you help in advance

[Troy_Clavell]

sounds to me as though you have the wrong HAL. Trying using a uniprocessor HAL

http://support.microsoft.com/kb/309283

[KNardi]

This is on a Windows 2003 server if that makes a difference. The above article fixes do not work!!!

[AntonVZhbankov]

Do not pay attention to Multiprocessor on uniprocessor VMs, that's not a problem completely.

Actually problem is when you have Uniprocessor HAL on Multiprocessor VM.

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VMware vExpert '2009

http://blog.vadmin.ru

[drummonds]

The uniprocessor HAL is more efficient than the multiprocessor HAL. If you only have a single vCPU assigned to your VM, you can improve performance slightly by forcing Windows back to the uniprocessor HAL. You can do this through the device manager and by specifying a driver to the CPU.

The performance difference generally is not great, though. We have measured it in single digit percentages that are workload dependent.

Scott

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