Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

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.

152 questions
37
votes
2 answers

Setting CPU governor to on demand or conservative

I'm struggling with cpupower on ArchLinux. I want to set governor to ondemand or even to conservative. First if I do $ sudo cpupower frequency-info --governors, I only get performance powersave. So I look for available modules like this ls -1…
lviggiani
  • 3,549
  • 7
  • 35
  • 67
31
votes
2 answers

Can't use "userspace" cpufreq governor and set cpu frequency

I'm trying to change the cpu frequency on my laptop (running Linux), and not having any success. Here are some details: # uname -a Linux yoga 3.12.21-gentoo-r1 #4 SMP Thu Jul 10 17:32:31 HKT 2014 x86_64 Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz…
aditsu quit because SE is EVIL
  • 395
  • 1
  • 3
  • 12
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
  • 1,067
  • 1
  • 11
  • 25
19
votes
3 answers

What are the implications of setting the CPU governor to "performance"?

I recently read that I can eke more performance out of my CPU by setting the governor to "performance" instead of "powersave". According to the Arch wiki, this will "run the CPU at the maximum frequency" instead of the "minimum frequency". I found…
Sparhawk
  • 19,561
  • 18
  • 86
  • 152
17
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
  • 335
  • 1
  • 2
  • 7
16
votes
5 answers

How can I get the current CPU frequency of an ARM processor on Ubuntu?

How can I get the current CPU frequency of an ARM processor on Ubuntu? Neither /proc/cpuinfo nor /sys/devices/system/cpu/cpu*/cpufreq helps. In fact, there is no /sys/devices/system/cpu/cpu*/cpufreq directory on my Ubuntu system. And there is no CPU…
sunshilong369
  • 211
  • 1
  • 2
  • 8
16
votes
2 answers

CPU temperatures in linux: throttling or wrong reading?

Using a Lenovo Legion Y520 with i7-7700HQ (base clock 2.8Ghz) and GTX 1050. I'm getting CPU overheating warnings in linux and it's affecting my performance in games (found in Payday 2 and CS:GO). I've never had problems in Windows. This is what I…
zjeffer
  • 425
  • 2
  • 5
  • 24
11
votes
1 answer

Set critical CPU temperature for thermal throttling

According to sensors, the critical temperature for my CPU cores is at 100°C. When using my laptop it never goes above 95°C (So either my sensor is defect or thermal throttling is set to a lower value for some reason, but this doesn't really matter).…
piegames
  • 797
  • 1
  • 9
  • 21
11
votes
1 answer

How to set up Linux for full AMD APU power management support: Turbo Core, Cool'n'Quiet, Dynamic Power Management?

My objective is to set up a mini server (not HTPC) with low power consumption in idle mode, yet offering nice performance when used. The focus is more on data safety than availability. In other words: quality parts, but redundancy only for…
Run CMD
  • 560
  • 1
  • 4
  • 21
8
votes
3 answers

Host CPU does not scale frequency when KVM guest needs it

Observation: I have an HP server with an AMD dual core CPU (Turion II Neo N40L) which can scale frequencies from 800 to 1500 MHz. The frequency scaling works under FreeBSD 9 and under Ubuntu 12.04 with the Linux kernel 3.5. However, when I put…
Huygens
  • 8,985
  • 3
  • 31
  • 36
8
votes
0 answers

Processor frequency stuck at minimum despite using performance governor. Kernel and hardware disagree on the frequency?

I am using a MacBook Retina with four processor cores on Linux (Ubuntu 18.04): $ grep -E '^model name|^cpu MHz' /proc/cpuinfo model name : Intel(R) Core(TM) i5-4258U CPU @ 2.40GHz cpu MHz : 799.976 model name : Intel(R) Core(TM) i5-4258U CPU @…
Dune
  • 81
  • 3
7
votes
3 answers

CPU Frequency drops under load without thermal issues

This problem is bothering me for some weeks now and I cannot seem to figure out what the real problem might be. The problem is that the CPU frequency is dropping drastically when under load. By this I mean that the CPU frequency is around 400 MHz…
aapje06
  • 81
  • 1
  • 5
7
votes
1 answer

Can I run multiple cores at different clock speeds?

I see the cores on an Intel i5 machine I'm looking at can only be run at the same clockspeed: /sys/devices/system/cpu/cpu1/cpufreq/related_cpus lists all of the CPUs. Setting cpu1's clockspeed changes cpu0's, as expected. Supposedly the AMD A6-4400M…
Matt
  • 183
  • 4
7
votes
2 answers

Set CPU to high performance

I spent hours searching for an answer in Internet. All I could find doesn't help. I have Intel i9-9980HK, running under Ubuntu 20.04, kernel 5.4.0-33. The problem is that under the full load the CPU lowers the frequency to 2.7 GHZ, I guess in order…
facetus
  • 218
  • 2
  • 10
7
votes
1 answer

How to set the CPU freq. in Linux?

I'm using this ARM9 SAM9G25 embedded system, that when switched on, is only online for a few seconds and because I want to speed up the whole process, I'd like to check the CPU frequency, and set it to max. speed. The Linux 2.6.39 kernel is…
user3085931
  • 886
  • 3
  • 15
  • 28
1
2 3
…
10 11