When you use the Custom policy for host power management, ESXi bases its power management policy on the values of several advanced configuration parameters.


Select Custom for the power management policy, as described in Select a CPU Power Management Policy.


  1. Browse to the host in the vSphere Client.
  2. Click Configure.
  3. Under System, select Advanced System Settings.
  4. In the right pane, you can edit the power management parameters that affect the Custom policy.
    Power management parameters that affect the Custom policy have descriptions that begin with In Custom policy. All other power parameters affect all power management policies.
  5. Select the parameter and click the Edit button.
    Note: The default values of power management parameters match the Balanced policy.
    Parameter Description
    Power.UsePStates Use ACPI P-states to save power when the processor is busy.
    Power.MaxCpuLoad Use P-states to save power on a CPU only when the CPU is busy for less than the given percentage of real time.
    Power.MinFreqPct Do not use any P-states slower than the given percentage of full CPU speed.
    Power.UseStallCtr Use a deeper P-state when the processor is frequently stalled waiting for events such as cache misses.
    Power.TimerHz Controls how many times per second ESXi reevaluates which P-state each CPU should be in.
    Power.UseCStates Use deep ACPI C-states (C2 or below) when the processor is idle.
    Power.CStateMaxLatency Do not use C-states whose latency is greater than this value.
    Power.CStateResidencyCoef When a CPU becomes idle, choose the deepest C-state whose latency multiplied by this value is less than the host's prediction of how long the CPU will remain idle. Larger values make ESXi more conservative about using deep C-states, while smaller values are more aggressive.
    Power.CStatePredictionCoef A parameter in the ESXi algorithm for predicting how long a CPU that becomes idle will remain idle. Changing this value is not recommended.
    Power.PerfBias Performance Energy Bias Hint (Intel-only). Sets an MSR on Intel processors to an Intel-recommended value. Intel recommends 0 for high performance, 6 for balanced, and 15 for low power. Other values are undefined.
  6. Click OK.