Why has CPU scaling in Xen hosts stopped working in RHEL5.8?

Solution Verified - Updated -

Issue

  • 'cpuspeed' service fails to start:
# service cpuspeed start
# ps -ef | grep cpuspeed | grep -v grep
#

Environment

  • Red Hat Enterprise Linux 5.8.
  • kernel-xen versions from 2.6.18-308.el5 to 2.6.18-308.13.1.el5 included.
  • Xen virtualization host.

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