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I have tried all the suggestions here How to disable CPU frequency scaling in CentOS 6?

However, the frequency still changes up and down. Even for CPUs I have isolated which are idle.

$ grep "cpu MHz" /proc/cpuinfo 

cpu MHz     : 3201.523

cpu MHz     : 2197.091

cpu MHz     : 3575.810

cpu MHz     : 3521.169

cpu MHz     : 1675.158

cpu MHz     : 3559.854

cpu MHz     : 3079.546

cpu MHz     : 3092.115

and

$ grep "cpu MHz" /proc/cpuinfo 

cpu MHz     : 2791.615

cpu MHz     : 3006.516

cpu MHz     : 2203.565

cpu MHz     : 2030.085

cpu MHz     : 1774.537

cpu MHz     : 3591.576

cpu MHz     : 3600.343

cpu MHz     : 3595.899

NOTE: the last two CPUs are isolated so basically idle at this time.

I have tried setting the BIOS to maximum speed and normal. I have tried all the governors and turning intel_pstates on and off.

$ cpupower frequency-info

analyzing CPU 0:

  driver: acpi-cpufreq

  CPUs which run at the same hardware frequency: 0

  CPUs which need to have their frequency coordinated by software: 0

  maximum transition latency: 10.0 us

  hardware limits: 1.20 GHz - 3.60 GHz

  available frequency steps:  3.60 GHz, 3.60 GHz, 3.40 GHz, 3.30 GHz, 3.10 GHz, 2.90 GHz, 2.70 GHz, 2.60 GHz, 2.40 GHz, 2.20 GHz, 2.10 GHz, 1.90 GHz, 1.70 GHz, 1.50 GHz, 1.40 GHz, 1.20 GHz

  available cpufreq governors: conservative userspace powersave ondemand performance schedutil

  current policy: frequency should be within 3.60 GHz and 3.60 GHz.

                  The governor "userspace" may decide which speed to use

                  within this range.

  current CPU frequency: Unable to call hardware

  current CPU frequency: 2.02 GHz (asserted by call to kernel)

  boost state support:

    Supported: yes

    Active: yes

The current speed is usually less than the minimum, however, I have seen it as 4.0 - 4.3 GHz.