AMD Ryzen 9 7950X P-State/CPUFreq Frequency Scaling Performance On Linux

Written by Michael Larabel in Software on 10 October 2022. Page 5 of 5. 24 Comments
Ryzen 9 7950X CPUFreq Drivers Governors

For not all workloads do the CPU frequency scaling driver/governor make a measurable difference on performance depending upon the CPU. For seeing acpi-cpufreq and amd-pstate tested across dozens of workloads, see this result page.

Ryzen 9 7950X CPUFreq Drivers Governors

Across the 100+ tests conducted, here is a look at the peak CPU frequency across the tested combinations. Using amd-pstate performance led to the highest peak frequencies being achieved on the Ryzen 9 7950X and even a noticeable improvement over the acpi-cpufreq performance configuration. Running and-pstate schedutil led to a similar median peak frequency to acpi-cpufreq ondemand/schedutil but while also exhibiting a much lower peak frequency.

Ryzen 9 7950X CPUFreq Drivers Governors

Here is a look at the CPU package power consumption expressed via RAPL across all of the tests carried out. Using amd-pstate schedutil led to a slightly lower average than acpi-cpufreq that was in surprisingly great shape.

Ryzen 9 7950X CPUFreq Drivers Governors

The Ryzen 9 7950X did see some small differences to the core temperatures based on the drivers/governors. The amd-pstate schedutil thermal results were similar to acpi-cpufreq performance.

Running amd-pstate schedutil as is the default on most modern Linux distributions for Zen 2 and newer AMD CPUs tended to yield the slowest performance while to no surprise amd-pstate performance meant the best performance. That's where things stand with the AMD Ryzen 9 7950X across the different Linux driver/governor combinations. Frankly I'd love to see more Linux distributions go the route of Intel's Clear Linux where the performance governor is used by default on desktops/servers and then sticking to schedutil for laptops/mobile systems by default. The amd-pstate schedutil default isn't too compelling from my tests on the Ryzen 9 7950X and other AMD Ryzen processors, but we'll see how things change once the latest AMD P-State EPP driver code is ready for the mainline kernel next year.

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About The Author
Michael Larabel

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, LinkedIn, or contacted via MichaelLarabel.com.