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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="ts_host-powermgmt">
<title>Poor Performance Caused by Host Power Management</title>
<body>
<p>
On some hardware platforms and operating systems, virtualization
performance is negatively affected by host CPU power management.
The symptoms may be choppy audio in the guest or erratic guest
clock behavior.
</p>
<p> Some of the problems may be caused by firmware or host operating system bugs. Therefore,
updating the firmware and applying operating system fixes is recommended. </p>
<p>
For optimal virtualization performance, the C1E power state
support in the system's BIOS should be disabled, if such a
setting is available. Not all systems support the C1E power
state. On Intel systems, the <codeph>Intel C State</codeph>
setting should be disabled. Disabling other power management
settings may also improve performance. However, a balance
between performance and power consumption must always be
considered.
</p>
</body>
</topic>
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