CONFIG_X86_INTEL_PSTATE disables CPU frequency transition stats,many governors and other standard features
From: Artem S. Tashkinov
Date: Sat Apr 27 2013 - 01:08:27 EST
Hello,
Just wanted to let everyone know that CONFIG_X86_INTEL_PSTATE wreaks
havoc with the CPU frequency subsystem in the Linux kernel.
With this option enabled:
1) All governors except performance and powersave are gone, ondemand
userspace, conservative
2) scaling_cur_freq is gone, thus user space utilities monitoring the CPU
frequency have stopped working
3) CPU frequency transition stats are gone, there's no "stats" directory
anywhere
4) scaling_available_frequencies is gone, so I cannot set the desired constant
CPU frequency (the userspace governor is not available anyway)
Is this an intended behavior? I shrivel to think that's the case.
The bug report is filed here: https://bugzilla.kernel.org/show_bug.cgi?id=57141
Best regards,
Artem
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