Questions tagged [cpu-frequency]
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.
161 questions
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46 views
How can I automatically set some CPU parameters (via `/sys/devices/system/cpu/...``) when the system boots?
DISTRO: Fedora 41 KDE GOAL: Im trying to automatically set some cpu parameters (per-CPU max frequency, governors, energy policy, etc.) during my boot process. I wrote a script to do this (it lives at /...
0 votes
1 answer
46 views
GUI app showing CPU/GPU frequency graph in time & stress CPU & GPU and/or fan speed (Throttling troubleshooting)
Looking for a GUI app that has the features below: Can show CPU cores frequency graphs in time (both average or per core works) Can stress/load all the CPU cores for a significant amount of time (...
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2 votes
1 answer
44 views
Probing Hardware for Sensor Data with High Frequency (Temperature and CPU clock frequency)
I'm trying to learn how to probe my CPU sensor data. I need at most 1 to 2 ms sampling period. Using hwmon this could be possible for the temperature data. But so far I only discovered the CPUfreq ...
- 25
2 votes
0 answers
120 views
IRQ Latency and CPU Use
I am running a system with RT-Preempt kernel v6.4.8-rt8 CPU is 12th Gen Intel(R) Core(TM) i7-12800HE This system is receiving data through the CAN Bus. Every 1 millisecond a burst of 3 messages is ...
- 121
1 vote
0 answers
193 views
sysfs missing CPU thermal_throttle information
Background Information: I'm running Ubuntu 24.04.1 LTS (Noble Numbat, kernel 6.8.0-51-generic) on an AMD Ryzen 9 7950X3D, and I'm investigating some odd behavior where the CPU governor/driver will ...
- 11
1 vote
0 answers
176 views
Discrepency of cpu MHz via bash and conky
Edit: The original question of this post was regarding the "average" cpu MHz as obtained via conky builtins and the command line. A further question was regarding temperatures as reported by ...
- 145
1 vote
0 answers
775 views
What does hwp_dynamic_boost do in the intel_pstate frequency scaling driver?
Looking at the intel_pstate kernel documentation, apparently hwp_dynamic_boost should dynamically increase performance when a task waiting on IO is selected to run. Enabling this feature will not ...
- 11
25 votes
2 answers
2k views
Why are my benchmark times not repeatable, even for a CPU-bound task?
I'm running some benchmarks on my Linux desktop/laptop computer, but I'm not getting reliable results. I'm running a CPU-intensive task that does negligible I/O and doesn't use much RAM. My computer ...
1 vote
0 answers
116 views
Avoiding the need for reboots when CPU thermally throttles itself
I'm on a Dell laptop with Sandy Bridge Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz CPU running a 5.15.0-100-generic Linux kernel. The CPU goes up to 3.4GHz (as both the MATE CPU Frequency Monitor ...
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2 votes
0 answers
140 views
Laggy PC with Kernel 6.5 and AMD 5500U Lucienne
I am currently facing a problem with my Lenovo E15 laptop (AMD Ryzen 5500u "Lucienne" processor) and the kernel 6.5. (Xubuntu 22.04) Maybe three weeks ago, I noticed that my computer was ...
0 votes
1 answer
2k views
Cannot set CPU to maximum speed
I am trying to set all my CPUs to the maximum GHz capability. But for some reason even though the CPU is capable of 5.76GHz, when I set it to performance it only get's to 4.2GHz. Looking at the ...
- 103
0 votes
1 answer
53 views
Gather CPU utilisation or different workloads
I am trying to figure out for different workloads (CPU intensive, high DB IOPs etc), which compute series of cloud VM would be ideal. In order to do that I need to be able to get the CPU utilisation. ...
- 123
3 votes
0 answers
793 views
What is the intended way to set `cpupower` on boot?
Running cpupower frequency-set -g powersave is a one-shot. I could think of a number of ways to make this happen on boot (rc.local, systemd one-shot, etc)... Question: Is there a "correct" ...
- 545
0 votes
0 answers
278 views
Why CPU Freq Crosses Hardware Limits and Policy Limits, and System Heat Up after Hybrid Sleep, in Debian 12 (Testing-Weekly)?
In Debian 12 (bookworm: testing-weekly): Installed auto-cpufreq and thermald, with auto-cpufreq.conf while on charger: governor = performance scaling_max_freq = 1900000 turbo = auto Thought ...
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5 votes
1 answer
968 views
CPU freq locked to 800mhz shortly after boot (ps15 thinkpad)
I've got a frustrating mystery and I'm hoping that someone can point me in the right direction. Problem: Under load, my system doesn't increase CPU frequency to meet demand after some period of time ...
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