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--- virtualization:xenserver:xenserver_pwr_mgmt [2014/12/08 07:42]
gcooper
+++ virtualization:xenserver:xenserver_pwr_mgmt [2017/01/25 11:29] (current)
gcooper
@@ Line 1: / Line 1: @@
 ====== Citrix XenServer and Power Management ======
-:!: Disable all power management in the BIOS.
+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)
-:!: Disable all C-states, including C1E.
 ===== 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 =====
+:!: Disable all C-states, including C1E.
+:!: If the server BIOS has power management options that leave power management to the BIOS rather than the operating system such as **Dell Active Power Controller** or **HP Power Regulator**, also disable this by setting the power management option to **OS Control**.
+Dell:
+  * Processor Settings -> Processor C-State Control
+  * Processor Settings -> Processor C1E
+HP:
+  * Power Management Options -> Advanced Power Mgmt Options -> Minimum Processor Idle Power State -> No C-States
+  * Power Management Options -> Advanced Power Mgmt Options -> Minimum Processor Idle Power Package State -> No Package State
+Intel:
   * Advanced -> CPU Configuration -> Enhanced Intel SpeedStep Technology
-  * Advanced -> CPU Configuration -> Turbo Mode
+  * Advanced -> CPU Configuration -> Turbo Mode (Turbo Boost)
   * Advanced -> CPU Configuration -> CPU C1E
   * Advanced -> CPU Configuration -> CPU C3 Report
   * Advanced -> CPU Configuration -> CPU C6 Report

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