scaling_governor not visible for all CPUs

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Environment

SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)

HP ProLiant G6, G7, Gen8 or Gen9 based hardware

Situation

While trying to change the scaling_governor to performance it is observed, that this setting is not available for all CPUs in the system:

# ls -d /sys/devices/system/cpu/cpu4/cpufreq/
/sys/devices/system/cpu/cpu4/cpufreq/
# ls -d /sys/devices/system/cpu/cpu5/cpufreq/
ls: cannot access '/sys/devices/system/cpu/cpu5/cpufreq/': No such file or directory

Resolution

Please change the power settings to HP Power Regulator.

Cause

This behavior may be observed if the BIOS is set to HP Dynamic Savings Mode.

Additional Information

Please see for details the following HP support advisory:

https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04704148&docLocale=en_US

Disclaimer

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