| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_host-powermgmt">
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| 4 | <title>Poor Performance Caused by Host Power Management</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | On some hardware platforms and operating systems, virtualization
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| 9 | performance is negatively affected by host CPU power management.
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| 10 | The symptoms may be choppy audio in the guest or erratic guest
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| 11 | clock behavior.
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| 12 | </p>
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| 13 | <p> Some of the problems may be caused by firmware or host operating system bugs. Therefore,
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| 14 | updating the firmware and applying operating system fixes is recommended. </p>
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| 15 | <p>
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| 16 | For optimal virtualization performance, the C1E power state
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| 17 | support in the system's BIOS should be disabled, if such a
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| 18 | setting is available. Not all systems support the C1E power
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| 19 | state. On Intel systems, the <codeph>Intel C State</codeph>
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| 20 | setting should be disabled. Disabling other power management
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| 21 | settings may also improve performance. However, a balance
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| 22 | between performance and power consumption must always be
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| 23 | considered.
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| 24 | </p>
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| 25 | </body>
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| 26 |
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| 27 | </topic>
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