You can't always get what you want: P-state selection on Intel CPUs

Session information has not yet been published for this event.


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-2014-web-2

    Kristen Accardi

    Intel Corp.


    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.