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RHEL 7 Still CPU Frequency Scaling



The 2019 Stack Overflow Developer Survey Results Are InSetting CPU frequency guidelinesIntel Core i3/i5/i7 Sandy Bridge CPU throttlingHow do I add CPU frequency governors to the Linux kernel?Force Haswell CPU to fixed frequencyIf cpu frequency scaling is not supported, server will run at max performance?what is the effect of setting cpu.cpu_quota_us in cpu cgroup?Is it possible to set a *constant* lowest CPU frequency under the modern PSTATE driver?What are the implications of setting the CPU governor to “performance”?Scale down to a specific frequency on Ubuntu Linux 14 w/ Intel CPUIntel Pstate frequency limits are overridden



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








2















When machine is imaged with:



RHEL6.x



  • CPU speeds report full 3.3Ghz speed for all CPUs

  • cpupowerutils is not installed

RHEL7.x



  • CPU speeds vary (shown in example below)

  • cpupowerutils is installed

I have checked the following:




  • /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor in RHEL7.x. It indicates performance for all CPUs.

  • To see if kondemand is running using pgrep -lf kondemand. It is not

  • To see if cpuspeed service is running using service cpuspeed status. It is not-found

Example RHEL 7.x cpu frequencies:



grep -E '^cpu MHz' /proc/cpuinfo
cpu MHz : 3317.273
cpu MHz : 2028.210
cpu MHz : 3464.226
cpu MHz : 3237.480
cpu MHz : 3455.332
cpu MHz : 1913.484
cpu MHz : 3425.167
cpu MHz : 2592.304
cpu MHz : 2746.218
cpu MHz : 2739.128
cpu MHz : 3202.417
cpu MHz : 3368.191
cpu MHz : 2815.441
cpu MHz : 3165.292
cpu MHz : 3327.457
cpu MHz : 2539.066


Output of cpupower:



cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.50 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.59 GHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
3400 MHz max turbo 4 active cores
3400 MHz max turbo 3 active cores
3500 MHz max turbo 2 active cores
3500 MHz max turbo 1 active cores









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bumped to the homepage by Community 2 days ago


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  • cpu MHz could lie to you

    – myaut
    Sep 28 '17 at 10:40

















2















When machine is imaged with:



RHEL6.x



  • CPU speeds report full 3.3Ghz speed for all CPUs

  • cpupowerutils is not installed

RHEL7.x



  • CPU speeds vary (shown in example below)

  • cpupowerutils is installed

I have checked the following:




  • /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor in RHEL7.x. It indicates performance for all CPUs.

  • To see if kondemand is running using pgrep -lf kondemand. It is not

  • To see if cpuspeed service is running using service cpuspeed status. It is not-found

Example RHEL 7.x cpu frequencies:



grep -E '^cpu MHz' /proc/cpuinfo
cpu MHz : 3317.273
cpu MHz : 2028.210
cpu MHz : 3464.226
cpu MHz : 3237.480
cpu MHz : 3455.332
cpu MHz : 1913.484
cpu MHz : 3425.167
cpu MHz : 2592.304
cpu MHz : 2746.218
cpu MHz : 2739.128
cpu MHz : 3202.417
cpu MHz : 3368.191
cpu MHz : 2815.441
cpu MHz : 3165.292
cpu MHz : 3327.457
cpu MHz : 2539.066


Output of cpupower:



cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.50 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.59 GHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
3400 MHz max turbo 4 active cores
3400 MHz max turbo 3 active cores
3500 MHz max turbo 2 active cores
3500 MHz max turbo 1 active cores









share|improve this question
















bumped to the homepage by Community 2 days ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.















  • cpu MHz could lie to you

    – myaut
    Sep 28 '17 at 10:40













2












2








2


1






When machine is imaged with:



RHEL6.x



  • CPU speeds report full 3.3Ghz speed for all CPUs

  • cpupowerutils is not installed

RHEL7.x



  • CPU speeds vary (shown in example below)

  • cpupowerutils is installed

I have checked the following:




  • /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor in RHEL7.x. It indicates performance for all CPUs.

  • To see if kondemand is running using pgrep -lf kondemand. It is not

  • To see if cpuspeed service is running using service cpuspeed status. It is not-found

Example RHEL 7.x cpu frequencies:



grep -E '^cpu MHz' /proc/cpuinfo
cpu MHz : 3317.273
cpu MHz : 2028.210
cpu MHz : 3464.226
cpu MHz : 3237.480
cpu MHz : 3455.332
cpu MHz : 1913.484
cpu MHz : 3425.167
cpu MHz : 2592.304
cpu MHz : 2746.218
cpu MHz : 2739.128
cpu MHz : 3202.417
cpu MHz : 3368.191
cpu MHz : 2815.441
cpu MHz : 3165.292
cpu MHz : 3327.457
cpu MHz : 2539.066


Output of cpupower:



cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.50 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.59 GHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
3400 MHz max turbo 4 active cores
3400 MHz max turbo 3 active cores
3500 MHz max turbo 2 active cores
3500 MHz max turbo 1 active cores









share|improve this question
















When machine is imaged with:



RHEL6.x



  • CPU speeds report full 3.3Ghz speed for all CPUs

  • cpupowerutils is not installed

RHEL7.x



  • CPU speeds vary (shown in example below)

  • cpupowerutils is installed

I have checked the following:




  • /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor in RHEL7.x. It indicates performance for all CPUs.

  • To see if kondemand is running using pgrep -lf kondemand. It is not

  • To see if cpuspeed service is running using service cpuspeed status. It is not-found

Example RHEL 7.x cpu frequencies:



grep -E '^cpu MHz' /proc/cpuinfo
cpu MHz : 3317.273
cpu MHz : 2028.210
cpu MHz : 3464.226
cpu MHz : 3237.480
cpu MHz : 3455.332
cpu MHz : 1913.484
cpu MHz : 3425.167
cpu MHz : 2592.304
cpu MHz : 2746.218
cpu MHz : 2739.128
cpu MHz : 3202.417
cpu MHz : 3368.191
cpu MHz : 2815.441
cpu MHz : 3165.292
cpu MHz : 3327.457
cpu MHz : 2539.066


Output of cpupower:



cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 1.20 GHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 1.20 GHz and 3.50 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.59 GHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
3400 MHz max turbo 4 active cores
3400 MHz max turbo 3 active cores
3500 MHz max turbo 2 active cores
3500 MHz max turbo 1 active cores






rhel performance cpu-frequency






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edited Dec 31 '15 at 20:38







rainereality

















asked Dec 31 '15 at 20:03









rainerealityrainereality

117416




117416





bumped to the homepage by Community 2 days ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.







bumped to the homepage by Community 2 days ago


This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.














  • cpu MHz could lie to you

    – myaut
    Sep 28 '17 at 10:40

















  • cpu MHz could lie to you

    – myaut
    Sep 28 '17 at 10:40
















cpu MHz could lie to you

– myaut
Sep 28 '17 at 10:40





cpu MHz could lie to you

– myaut
Sep 28 '17 at 10:40










1 Answer
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oldest

votes


















0














RHEL7 introduced a new daemon called 'tuned' which touches a bunch of settings including the cpu scaling. Check to see if that's running and mucking with things






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    RHEL7 introduced a new daemon called 'tuned' which touches a bunch of settings including the cpu scaling. Check to see if that's running and mucking with things






    share|improve this answer



























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      RHEL7 introduced a new daemon called 'tuned' which touches a bunch of settings including the cpu scaling. Check to see if that's running and mucking with things






      share|improve this answer

























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        RHEL7 introduced a new daemon called 'tuned' which touches a bunch of settings including the cpu scaling. Check to see if that's running and mucking with things






        share|improve this answer













        RHEL7 introduced a new daemon called 'tuned' which touches a bunch of settings including the cpu scaling. Check to see if that's running and mucking with things







        share|improve this answer












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        share|improve this answer










        answered Feb 23 '17 at 15:25









        Dave MDave M

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