Public bug reported:
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://de.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
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://de.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
root@be:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], 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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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 protected], 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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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 protected], 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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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 protected], 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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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 protected], 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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
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.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 995 MHz.
root@be:~#
** Affects: cpufrequtils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1866449
Title:
cpufreq, or what's behind it, doesn't observe maximal frequencies set
for individual cores
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