Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract




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Processor Performance Core Parking Utility Distribution


Utility Distribution is an algorithmic optimization in Windows Server 2012 that is designed to improve power efficiency for some workloads. It tracks “unmovable” CPU activity (that is, DPCs, interrupts, or strictly affinitized threads), and it predicts the future work on each processor based on the assumption that any movable work can be distributed equally across all unparked cores. Utility Distribution is enabled by default for the Balanced power plans for some processors. It can reduce processor power consumption by lowering the requested CPU frequencies of workloads that are in a reasonably steady state. However, Utility Distribution is not necessarily a good algorithmic choice for workloads that are subject to high activity bursts or for programs where the workload quickly and randomly shifts across processors. For such workloads, we recommend disabling Utility Distribution by using the following commands:

Powercfg -setacvalueindex scheme_current sub_processor DISTRIBUTEUTIL 0

Powercfg -setactive scheme_current



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Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract

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