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--- virtualization:xenserver:xenserver_pwr_mgmt [2014/12/08 08:01]
gcooper
+++ virtualization:xenserver:xenserver_pwr_mgmt [2017/01/25 11:29] (current)
gcooper
@@ Line 1: / Line 1: @@
 ====== Citrix XenServer and Power Management ======
+See also **[[computing:power_mgmt|Power Management]]**
+See also **[[https://www.sonoracomm.com/wiki/doku.php?do=search&id=xenserver|other XenServer pages in this wiki]]**
+https://wiki.xenserver.org/index.php?title=Power_Management
 http://www.ingmarverheij.com/damn-you-c-states-unexpected-xenserver-reboot/
 http://support.citrix.com/article/CTX127395
+:!: With newer XenServer versions, it is **no longer recommended to disable power management** in the server BIOS.
 :!: Disable all power management in the BIOS:
   * AMD Power Now
+  * Cool'n'Quiet
   * Intel SpeedStep
+  * Enhanced Intel SpeedStep (EIST)
 ===== Get Power Managemment Status =====
-A result above ''2'' indicates you need to disable power management in the BIOS:
+On the XCP/XenServer host as ''root'':
+<file>
+xenpm get-cpufreq-states
+</file>
+No output indicates the (SpeedStep, PowerNow) power management has already been disabled.
 <file>
 xenpm get-cpuidle-states | grep total | uniq
 </file>
+If C2 or higher is listed and there is time spent in that higher level state, this indicates that higher level C-states are still active. Check BIOS settings to disable the higher C-states.
+:!: A result above ''2'' indicates you need to disable power management in the BIOS.
 ===== BIOS Settings =====

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