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XEN Windows virtual machine does not use additional vcpu

This document (7001670) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 10 Service Pack 2
SUSE Linux Enterprise Server 10 Service Pack 1


When the vcpu number is increased on a Windows vm, the vm does not appear to use the additional vcpus.

xm vcpu-list shows only one vcpu as running; Others appear in a "paused" state


Check the Windows VM to see if HAL is using the driver for multiple processors.  If the VM was originally installed with a single vcpu then it probably is not. 

The resolution is to install the multi-processor HAL in the Windows VM.  See Microsoft's support site for the current recommended method for the operating system in question.


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7001670
  • Creation Date: 16-Oct-2008
  • Modified Date:14-Mar-2021
    • SUSE Linux Enterprise Server

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