Use this tag for questions about how to detect and/or set the clock speed of cpu cores of Unix or Linux systems, automatic frequency scaling and adapting core voltages according to the core frequency.
Questions tagged [cpu-frequency]
153 questions
25
votes
3 answers
Is it possible to set a *constant* lowest CPU frequency under the modern PSTATE driver?
The new pstate Intel driver pisses me off for good, because they have removed the good old powersave governor that allowed me to set the lowest available CPU frequency and run my numerical simulations for hours or days in a nicely silent, cold…
Mephisto
- 1,077
19
votes
1 answer
Why do cpuinfo_cur_freq and /proc/cpuinfo report different numbers?
When I do
sudo watch -n1 cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq
I get 1.8 - 2.7 GHz. It never goes above 2.7.
And when I do
watch -n1 "cat /proc/cpuinfo | grep MHz"
I get 768 MHz - 1.8 GHz. It never goes above 1.8.
Anyone…
wulftone
- 355
5
votes
1 answer
How come different hyperthreads have a different clock speed?
I have an Intel Core i5-2520M CPU in my laptop which has two physical cores and hyperthreads, resulting in four logical cores. When looking at /proc/cpuinfo, I see four different clock speeds:
$ grep MHz /proc/cpuinfo
cpu MHz : 1124.114
cpu…
Martin Ueding
- 2,702
1
vote
1 answer
Why does CPU governor not respect max CPU speed limit?
I have run:
sudo parallel cpufreq-set -c {} -u 2000MHz ::: 0 1 2 3
yet when I stress the CPU, cpufreq-info returns:
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency…
Ole Tange
- 35,514
1
vote
2 answers
cpupower and libcpupower
cpupower fails sometime to execute with this error :
cpupower: error while loading shared libraries: libcpupower.so.0: cannot open shared object file: No such file or directory
I've compiled and installed the last cpupower tool from sources on my…
0
votes
1 answer
Limit an Intel i5 CPU 8th generation
I would like to throttle my CPU, I have an i5-8265U and it has frequencies up to 3.9GHz, but I rarely need the speed.
Now if something causes a high load, the CPU goes up and the fan gets noisy.
It is already set to powersave
$ cat…
rubo77
- 28,966
0
votes
1 answer
no or unknown cpufreq driver is active after disabling intel_pstate driver
After disabling intel_pstate driver, I get the following error:
cpupower frequency-info
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
CPUs which run at the same hardware frequency: Not Available
CPUs which need to have…
Robert
- 1
- 1
- 2