How to permanently limit cpu frequency

Question

I need to limit the cpu frequency of my Linux machine. I know about cpufreq sysfs, but limiting online is too late in my case.

Is there a kernel parameter for this?

Where do the values for cpuinfo_max_freq and scaling_max_freq come from? Can I change them before the governor starts changing cpu frequencies? Can I change the default governor (to powersave for example)?

Answer 1

You can achieve this by compiling the kernel and enabling only the "powersave" governor.

This sets the frequency statically to the lowest frequency supported by the CPU

Check here to see if this can be set as kernel parameter for a multi-governor kernel