Questions tagged [cpu-frequency]

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Is there a way to make my computers fans turn on instead of the CPU dropping frequency? I'm using Linux Mint 19.3

My computer, for whatever reason, will lower CPU usage when it gets hot instead of turning on its fan. I don't know if it's a driver issue or something else. Thanks! The above is at 80 degrees ...
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1answer
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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 ...
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i3-530. Debian 10. Set maximal frequency. Is that even possible?

I'm having some small server on debian 10 uuner i3-530. Now it's working on low frequency: cat /proc/cpuinfo | grep "MHz" cpu MHz : 1196.898 cpu MHz : 1196.901 cpu MHz : ...
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What's the difference between cpupower and cpuspeed?

These two programs seems both doing freq scaling. What's their difference?
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1answer
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How do I set my CPU governor on boot?

I'm running Linux Mint 19.2 with a custom kernel (5.4.2-blackbox) and I'm trying to set my CPU governor to "performance" on boot. I have an i7 7700k and I tried disabling p-state with GRUB using ...
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1answer
51 views

What is the CPU frequency driver for AMD?

I know we have acpi_cpufreq driver and intel_psteate driver to use. However, I think intel_pstate driver is for Intel. What's the CPU frequency driver for AMD? Any introduction ( ex: governors ) ...
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cpu frequency reported values

I have a 4 socket server, running E5-4667v3. I have the power profile set to performance low-latency. For reference: https://ark.intel.com/content/www/us/en/ark/products/85765/intel-xeon-processor-...
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Power management in Qualcomm SoCs vs CPUFreq based power management

https://www.qualcomm.com/news/onq/2013/10/25/power-vs-performance-management-cpu I was going through the above document and read that "The Krait CPU cores of Snapdragon processors lie on separate ...
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is intel_pstate working with or without HWP?

I wonder If intel_pstate is working in active mode with OR without HWP enabled? I believe the processor supports HWP because as I can see 4 HWP flags when I cat /proc/cpuinfo. Namely I can see: hwp ...
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Will tlp's CPU_SCALING_GOVERNOR_ON_AC settings conflict with the Mate cpufreq widget?

I want to find a way to set the CPU governor to powersave on boot, and then manage it through the CPU frequency scaling monitor widget. However, the comments in the config file of tlp say "You must ...
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Scaling frequency to control temperature on 15 year old system

My 15 year old PC's temperature is much higher on Linux than what I see on Windows 7! On Windows 7, I used a tool CoreTemp to monitor the temperature and on idle it usually sticks around 45C BUT on ...
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How to alter Intel CPU speed governor?

What I've noticed while resolving the overheating issue is my AMD Quad Core cpus always remain at 800 MHz (minimum) on idle and on intensive task it almost always stays at 3200 MHz (maximum) BUT the ...
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1answer
216 views

Scaling CPU frequency

I've a Desktop and a Laptop with overheating issue and as far as I've known from Arch Wiki and other contributors on this site, I've to limit the cpu frequency to resolve the issue. On both system I'...
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1answer
180 views

Bash Script for evaluation of the CPU usage

I am trying to write a BASH script which will evaluate and show in the terminal a list of all cores and their current load. I am using the output of the /proc/stat. For example: cat /proc/stat ...
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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....
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1answer
124 views

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 ...
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1answer
67 views

How to manually set CPU clock frequency in Fedora?

I have a first generation i7 computer and it is prone to overheating. How can I set the CPU clock frequency in Fedora?
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Which reasons may cause low MHz of CPU

My system is Ubuntu 16.04.3. I installed it just now and executed some processes on it. I found that many processes used more than 100% CPUs. However, when I executed lscpu | grep MHz, I got the ...
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913 views

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 ...
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236 views

Command cpupower does not impact CPU frequency

I am trying to fix the frequency of all the cores to some constant value, with no success. Settings Computer with 2 Intel Xeon Gold 6130 CPU, with 16 cores each Kernel 4.9.0-8-amd64 Intel p-state ...
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cpupower frequency-set does not work

So I have this Dual Intel Silver 4116 CPU server that will set the MHz to 132 randomly, the server becomes unusable after that point. Even reboots don't restore the MHz, only driving to the data ...
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1answer
231 views

How can my cpu frequency be above maximum MHz value in lscpu?

How can it be, that my current cpu frequency (CPU MHz) for my Intel Core2 Duo T9400M is above max MHz while being on high load? ➜ lscpu [...] Model name: Intel(R) Core(TM)2 Duo CPU ...
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Check if the cpu clock speed has historically changed in RHEL6

I have a RHEL6 server running on a vmware-esxi host but no access to the host or vCenter. I need to determine if the hosting provider is using power saving features one such way is to check if CPU ...
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Moving from Phenom II to A6 APU - frequency does not reduce in Ondemand

Due to a hardware failure I had to move the Linux system from the Phenom II where the frequency stayed at 800 Mhz and scaled up when necessary, to an A6 APU system, where the frequency always stays at ...
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Unresponsive system with powersave governor on Thinkpad X1 Carbon

Using a Thinkpad X1 Carbon 2018 (6th Gen) on Ubuntu 18.10 with kernel 4.18 I notice that the system feels unresponsive even in AC mode. It's most noticable in Firefox (but not restricted to it) ...
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1answer
4k views

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'...
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3answers
715 views

Turn off CPU turbo-boost for a process

When the CPU (Intel i5-8400) is heavily loaded, the fan seems to increase its speed and make noise. I want to eliminate the noise when running CPU-intensive backup process (backup2l program). (It is ...
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2answers
528 views

Linux utility to bench mark clock speed of CPU

I have a Linux PC with a 3.4 GHz CPU. I must check this processor to see if it actually runs at that speed. Is there a benchmark available? I ran sysbench but it only provides time of completion, and ...
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1k views

How to disable cpu frequency scaling in Centos 7

I have tried all the suggestions here How to disable CPU frequency scaling in CentOS 6? However, the frequency still changes up and down. Even for CPUs I have isolated which are idle. $ grep "cpu ...
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750 views

Intel Pstate frequency limits are overridden

Problem : Run all core on minimum CPU frequency on Intel pstate driver on ubuntu 14. cpupower frequency-set --governor performance --max 1300MHz I am trying to run my cpu cores on different ...
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1answer
4k views

Change the cpufreq driver from intel pstate to acpi

I am trying to disable the intel pstate cpufreq driver and replace it with acpi to get maximum cpu control. I tried this. vim /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable quiet ...
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1answer
306 views

Scale down to a specific frequency on Ubuntu Linux 14 w/ Intel CPU

I am trying to scale down one of the CPU frequencies. I am using Ubuntu 14 and Linux kernel 4.4. I want to scale down the cpu3 frequency to 1.2 CONSTANT (no throttle). Things I have tried: I want ...
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1answer
554 views

What is CPU min MHz in lscpu output?

There are CPU MHz, CPU max MHz and CPU min MHz in lscpu output. What are they mean? Especially the CPU min MHz? We can think CPU max MHz is maximum CPU frequency and CPU MHz as current usage. Why ...
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1answer
138 views

Setting processor governor to maximum

I tried to use cpupower utility to manually set processor governor to performance. However, it seems that it has no effect! # cpupower frequency-set -g performance Setting cpu: 0 Setting cpu: 1 ...
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0answers
390 views

Do Linux cpufreq governers temporarily change sysfs's scaling_max_freq?

The linux documentation of the variable sysfs scaling_max_freq reports Maximum frequency the CPUs belonging to this policy are allowed to be running at (in kHz). This attribute is read-...
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2answers
632 views

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 ...
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1answer
3k views

How can I enable Intel's P-State driver?

I am trying to use Intel's P-State driver for my custom-built kernel (based on Linux 4.4.55). I have enabled the driver in the kernel configuration (by setting the X86_INTEL_PSTATE flag to "*"), but ...
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1answer
2k views

Get all available frequency steps

With cpupower, I can set arbitrary minimum and maximum frequencies. However, the CPU will round those values to the next frequency scale it can do (this is because of frequency multipliers I think). ...
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1answer
3k views

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 ...
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1answer
129 views

Clockspeed graphing program in linux

Is there a program to graph (CPU) clockspeeds in real time? For example, something like psensor which is useful for temperature graphs. EDIT: Running Fedora 27 on a Ryzen system (Pinnacle Ridge)
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451 views

Turn on cpu boost state

Is it possible to set boost cpu frequency on laptop (there is no any cpu settings in bios available)? If I try set such "boost frequency" it successed, but frequency setting to maximum frequency in ...
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2answers
6k views

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 ...
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1answer
119 views

What does `/usr/lib/pm-utils/sleep.d/94cpufreq` try to do?

On my Ubuntu 16.04, I am trying to understand a system default file /usr/lib/pm-utils/sleep.d/94cpufreq (see the end of this post for its content.) Is "${PM_FUNCTIONS}" a script, given that it is ...
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1answer
2k views

/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed: Invalid argument [duplicate]

I was stuck when trying to write to a system file to change the cpu frequency: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed <unsupported> $ echo 1600000 | sudo tee /sys/...
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1answer
10k views

How to force all CPU cores to run at maximum turbo boost frequency? [duplicate]

My goal is to force all CPU cores to run at maximum turbo frequency (4 x 3.9 GHz) using CentOS 7. Here is the output of cpupower frequency-info: analyzing CPU 0: driver: acpi-cpufreq CPUs which ...
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2answers
115 views

Can i tell my Linux machine use only Physical Cores?

I have a Linux Machine with 2 X5650 2.7GHZ Processors and I host game servers on it for my gaming community, and there comes my issue: game servers need best 1 core performance, but I have 24 vCORES ...
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7k views

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 ...
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2answers
1k views

Why is /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed not modifiable by sudo emacs?

I would like to edit /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed to change its content from 800000 to 1600000. I first try with emacs $ sudo emacs -nw /sys/devices/system/cpu/cpu0/cpufreq/...
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1answer
191 views

Why does modifying `scaling_setspeed` of a cpu change the realtime frequencies of both cpus?

My laptop Thinkpad T400 with Ubuntu 16.04 has two cpu cores cpu0 and cpu1. $ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq 797963 797963 $ cat /sys/devices/system/cpu/cpu*/cpufreq/...
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1answer
846 views

Which is better, High CPU % with Low Frequency or the opposite? [closed]

January 15, 2018 update I created a 90 second Conky .gif showing "normal" behavior during start up: A few seconds after boot I start Conky. A few seconds later I start Peek which begins recording ....