Performance Tuning for Active Directory Servers




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Processor Performance Boost Policy


Intel Turbo Boost Technology is a feature that allows Intel processors to achieve additional performance when it is most useful (that is, at high system loads). However, this feature increases CPU core energy consumption, so we configure Turbo Boost based on the power policy that is in use and the specific processor implementation. Turbo Boost is enabled for High Performance power plans on all Intel processors and it is disabled for Power Saver power plans on all Intel processors. TurboBoost is disabled on Balanced power plans for some Intel processors. For future processors, this default setting might change depending on the energy efficiency of such features. To enable or disable the Turbo Boost feature, you must configure the Processor Performance Boost Policy parameter.

The Processor Performance Boost Policy is a percentage value from 0 to 100. The default value of this parameter is 49 percent on Balanced plans and 0 percent on Power Saver plans. Any value lower than 50 disables Turbo mode on some current Intel processors. To enable Turbo Mode, set this value to 50 or higher.

The following commands set Processor Performance Boost Policy to 100 on the current power plan. Specify the policy by using a GUID string, as shown below:

Powercfg -setacvalueindex scheme_current sub_processor 45bcc044-d885-43e2-8605-ee0ec6e96b59 100

Powercfg -setactive scheme_current
Note that you must run the powercfg -setactive command to enable the new settings. You do not need to reboot the server.

To set this value for power plans other than the current selected plan, you can use aliases such as SCHEME_MAX (Power Saver), SCHEME_MIN (High Performance), and SCHEME_BALANCED (Balanced) in place of SCHEME_CURRENT. Replace “scheme current” in the powercfg -setactive commands shown above with the desired alias to enable that power plan. For example, to adjust the Boost Policy in the Power Saver plan and make Power Saver the current plan, run the following commands:

Powercfg -setacvalueindex scheme_max sub_processor 45bcc044-d885-43e2-8605-ee0ec6e96b59 100

Powercfg -setactive scheme_max





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Performance Tuning for Active Directory Servers

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