RHEL5.8: Unable to set cpu frequency on XEN kernels

Solution Verified - Updated -


  • When the userspace governor is used, it is not possible to set the cpu frequency using cpufreq-set
  • The cpuspeed service is not setting the cpu frequency, they stay at maximum frequency


  • Red Hat Enterprise Linux (RHEL) 5.8
  • kernel-xen in use
  • kernel-xen versions >2.6.18-308
  • kernel-xen versions <2.6.18-348

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