You can't always get what you want: P-state selection on Intel CPUs
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One Line Summary
An overview of how Performance States work on Intel platforms
This will be an overview of how Performance States (P-states) work on Intel platforms. We will start with how the platform handles p-states. We will then discuss the OS p-state selection algorithm in intel_pstate. Finally, we will talk about hardware controlled p-states (HWP). Knowing how p-state selection actually happens should help us understand how energy aware scheduling in the OS may or may not benefit Intel platforms.
Kristen is a Linux kernel engineer working on power management for Intel’s Open Source Technology Center and is the maintainer of the intel_pstate driver. Kristen has been contributing to the Linux kernel for over 15 years in various different subsystems including PCI, SATA, and ACPI.