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Why is “ondemand” kernels CPU governor more efficient than the “conservative” one (or than manually lowering CPU freq)?

April 26, 2017conservative CPU Governor Kernel lowering ondemand

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Why is “ondemand” kernels CPU governor more efficient than the “conservative” one (or than manually lowering CPU freq)?

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At lower freqs, your CPU may take more time to execute heavy tasks, so will spend less time in idle (power saving) state. The “ondemand” governor solves this by elevating the CPU to full speed when needed, so it can go back to idle state quickly.