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What are CPU governor settings? How can I get their values, if they're set? I have 24 vCPUs on my machine.

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To get the current settings, run cpufreq-info.

For more information about cpu governors, you can e.g. look at the kernel documentation Documentation/cpu-freq/governors.txt or look here or here.

For current processors, normally the ondemand governor gives the best power saving and good performance.

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