How to disable cpu frequency scaling in Centos 7











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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.










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    up vote
    1
    down vote

    favorite
    1












    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.










    share|improve this question
























      up vote
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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.










      share|improve this question













      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.







      centos bios cpu-frequency






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      asked Sep 19 at 16:03









      Peter Lawrey

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