Saving frequency scaling in the data center

We've just had a lengthy discussion on this topic (dc business). The conclusion was that it's all overcomplicated. C states, p states, power governor, idle governor, power driver, idle driver, cpufreq, intel_pstate, ondeman governor which worse than powersave, etc, etc.

The opinion was that this is just too much for a simple feature to save some power. So we've opted for unconditional performance.

It would be nice to have a way to trim power a bit, but not at cost of years of stidy of that spaghetti bowl of leaking abstractions and hardware wishthinking.

I appreciate efforts of kernel people a lot, but whole powersaving saga demands more that returns back.