If we don’t set the scaling governor policy to be performance kernel can decide that it’s better to save power and throttle. Setting scaling_governor to ‘performance’ helps to avoid sub-nominal clocking. Here is the documentation about Linux CPU frequency governors.

Here is how we can set it for all the cores:

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for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
  do echo performance > $i
done

Ref

https://easyperf.net/blog/2019/08/02/Perf-measurement-environment-on-Linux
https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt