AMD P-State v7 Driver Posted For Delivering Better Ryzen Efficiency In 2022
Written by Michael Larabel in AMD on 25 December 2021 at 04:33 AM EST. 1 Comment
AMD --
AMD on Christmas Eve posted their seventh iteration of the AMD P-State Linux driver as their new CPU frequency scaling solution for Zen 2+ to make use of ACPI CPPC for ultimately striving toward optimal power efficiency with a focus on mobile and desktop systems.

This driver was developed in cooperation with Valve and has been out for review since September. Now as we end out the calendar year they are up to the seventh revision of this driver and is appearing that it may be ready for mainline soon.

The amd-pstate driver has been evolving nicely and now working across more Zen 2 and Zen 3 systems (older processors won't be supported due to needing ACPI Collaborative Processor Performance Controls, the CPPC support must also be enabled from the system BIOS). This driver can make more informed CPU frequency scaling decisions than the much more basic ACPI CPUFreq driver currently used by Ryzen and EPYC systems.


With the v7 patches not much has changed besides altering the some macro names in the code and capitalization tweaks. Assuming no major issues come up, it's looking like this amd-pstate driver will be ready for mainlining in the near future. At that point I'll also be around with more benchmarks of this driver for raw performance and power efficiency across a range of AMD Linux systems.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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