Question

10

Disabling AMD's equivalent (on a Zen-1 Epyc) of Intel's "turbo boost" at runtime?

rated 0 times [ 10] [ 0] / answers: 1 / hits: 5363 / 2 Years ago, thu, march 24, 2022, 6:45:51

This may be a terminology problem at my end and a duplicate: On Intel CPUs, I can relatively easy disable turbo boost at runtime by running something like

echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo

The CPU then runs at its base clock without "turboing up". The nice thing is that I do not need to change BIOS/(U)EFI settings for that.

What would be the equivalent (in terms of both terminology and commands) on AMD CPUs, specifically on a Zen-1 Epyc?

I am trying to run the CPU at constant (low) speed for consistent benchmark results. I am trying to compare different software implementations of algorithms.

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answered 2 Years ago alliulet · Accepted Answer

By default, AMD processors use the acpi-cpufreq CPU frequency scaling driver.

Check via:

grep . /sys/devices/system/cpu/cpufreq/policy*/scaling_driver

For that driver, to disable turbo boost, do:

echo "0" | sudo tee /sys/devices/system/cpu/cpufreq/boost