user_Troubleshooting.xml

Timestamp:

Dec 3, 2010 4:32:30 PM (14 years ago)

Author:

vboxsync

Message:

Manual: Added a note about host power management.

File:

trunk/doc/manual/en_US/user_Troubleshooting.xml

-              r34611
+              r34707
       commands is possible by setting the value to 1 or by removing the
       key.</para>
+    </sect2>
+    <sect2 id="hostPowerMgmt">
+      <title>Poor performance caused by host power management</title>
+      <para>On some hardware platforms and operating systems, virtualization
+          peformance is negatively affected by host CPU power management. The
+          symptoms may be choppy audio in the guest or erratic guest clock
+          behavior.
+      </para>
+      <para>Some of the problems may be caused by firmware and/or host operating
+          system bugs. Therefore, updating the firmware and applying operating
+          systems fixes is recommended.</para>
+      <para>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). Disabling
+          other power management settings may also improve performance. However,
+          a balance between performance and power consumption must always be
+          considered.
+      </para>
     </sect2>
   </sect1>

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