cpufreq, or what's behind it, doesn't observe maximal frequencies set for individual cores
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| cpufrequtils (Ubuntu) |
New
|
Undecided
|
Unassigned | ||
Bug Description
When I lower the maximal acceptable frequency for individual cores, this is not immediately observed. The frequency drops, though, when I lower the maximal frequency for more individual cores. When all cores are set to the same maximal frequency, the limit seems to be observed. Shell output with additional newlines for readability:
root@be:~# lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10
root@be:~# apt-cache policy cpufrequtils
cpufrequtils:
Installed: 008-1.1
Candidate: 008-1.1
Version table:
*** 008-1.1 500
500 http://
100 /var/lib/dpkg/statu
root@be:~# apt-cache policy cpufreqd
cpufreqd:
Installed: (none)
Candidate: 2.4.2-2ubuntu3
Version table:
2.4.2-2ubuntu3 500
500 http://
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
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: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.45 GHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.91 GHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.64 GHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.93 GHz.
root@be:~# cpufreq-set -c 0 -u 1000000
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
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: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.91 GHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.90 GHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.96 GHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.85 GHz.
root@be:~# cpufreq-set -c 1 -u 1000000
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
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: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.17 GHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.20 GHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.31 GHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.67 GHz.
root@be:~# cpufreq-set -c 2 -u 1000000
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
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: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.21 GHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.00 GHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 1.05 GHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 2.50 GHz.
current CPU frequency is 1.73 GHz.
root@be:~# cpufreq-set -c 3 -u 1000000
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to <email address hidden>, please.
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: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 995 MHz.
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 980 MHz.
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 995 MHz.
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 4294.55 ms.
hardware limits: 800 MHz - 2.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 800 MHz and 1000 MHz.
current CPU frequency is 995 MHz.
root@be:~#
