Tuning Applications for Remote Desktop Session Host




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Processor Performance Core Parking Maximum and Minimum Cores


Core parking is a new feature in Windows Server 2008 R2. The processor power management (PPM) engine and the scheduler work together to dynamically adjust the number of cores available to execute threads. The PPM engine chooses a minimum number of cores on which threads will be scheduled. Cores that are chosen to be “parked” will generally not have any threads scheduled on them and they will drop into very low power states when not processing interrupts or DPCs, or other strictly affinitized work. The remaining set of “unparked” cores is responsible for the remainder of the workload. Core parking can increase energy efficiency during lower usage periods on the server because parked cores can drop into deep low-power states.

For most servers, the default core-parking behavior provides the optimum balance of throughput and energy efficiency. If your server has specific core-parking requirements, you can control the number of cores available to park by using either the Processor Performance Core Parking Maximum Cores parameter or the Processor Performance Core Parking Minimum Cores parameter in Windows Server 2008 R2.

The values for these parameters are percentages in the range 0–100. The Maximum Cores parameter controls the maximum percentage of cores that can be unparked (available to run threads) at any time, while the Minimum Cores parameter controls the minimum percentage of cores that can be unparked. To turn off core parking, set the Minimum Cores parameter to 100 percent by using the following commands:

Powercfg -setacvalueindex scheme_current sub_processor bc5038f7-23e0-4960-96da-33abaf5935ec 100

Powercfg -setactive scheme_current
To reduce the number of schedulable cores to 50 percent of the maximum count, set the Maximum Cores parameter to 50 as follows:

Powercfg -setacvalueindex scheme_current sub_processor bc5038f7-23e0-4960-96da-33abaf5935ec 50

Powercfg -setactive scheme_current



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Tuning Applications for Remote Desktop Session Host

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