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Questions tagged [cpu-frequency]

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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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33 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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93 views

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
46 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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21 views

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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0answers
60 views

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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183 views

How to permanently set CPU governor without `cpufrequtils`?

Hardware: Dell Inspiron 15 Gaming 7577, model number 7577-92774. System: I am on Linux Mint 19.1; based on Ubuntu 18.04. Processor: I have an Intel Kaby Lake CPU: Intel Core i7-7700HQ. I have read ...
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1answer
490 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
331 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
78 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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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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startx turns LCD off [closed]

I have written a driver for linux to communicate with /dev/fb0. When system boots, The LCD turns on and displays random colors, but when startx runs (that I expect desktop environment to be shown), ...
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484 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
2k 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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0answers
184 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
258 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
77 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
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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
374 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 ...
2
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1answer
2k 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
988 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
2k 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
76 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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210 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
3k 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
68 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
1k 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
6k 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 ...
0
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1answer
75 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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2answers
4k 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
875 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
117 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
492 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 ....
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0answers
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Hardware Frequency Steps - Intel P-State vs ACPI CPUFREQ

I have Intel Xeon Phi 7210 running CentOS 7 with kernel 3.10.0-514.el7.x86_64. I am comparing what frequency steps are available when I boot system into intel p-state vs when the system uses acpi ...
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1answer
47 views

How come different hyperthreads have a different clock speed? [closed]

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 ...
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1answer
503 views

What are the frequencies displayed in /proc/cpuinfo?

I have a quad core cpu (core i7 7700) with hyperthreading. cat /proc/cpuinfo | grep MHz returns 8 different frequencies, some of which are not repeated (for example I can get a single value of 3914....
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0answers
833 views

Limited cpupower policy scaling

How do I change the cpufreq policy range? $ cpupower frequency-info analyzing CPU 0: driver: powernow-k8 CPUs which run at the same hardware frequency: 0 1 CPUs which need to have their ...
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3answers
298 views

Limit CPU frequency/usage energy-management style

I believe the CPU on my laptop is damaged. Every time I attempt to launch a CPU intensive task (UHD video playing / python math libraries) my whole system freezes. I noticed I can avoid this by ...
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0answers
118 views

Powersave CPU frequency governor does not keep frequency low? Is this normal?

I have configured my system to use the powersave governor for CPU frequency, in order to increase battery life. However, even after setting it up and verifying that it is active, my cpu frequency is ...
3
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1answer
4k views

how to turbo boost my cpu on Ubuntu?

My PC has one Intel Haswell i5 4690, which is supposed to be boosted up to 3.9GHz from the regular frequency 3.5GHz. I do not know if it is possible to use some softwares to turbo boost this cpu on ...
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1answer
2k views

How to disable CPU frequency scaling in CentOS 6?

I have two exactly same bare metal servers with same OS/kernel configuration, but they are running at two different CPU frequencies: the one is fixed at 2300MHz, while the other changes between ...
4
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1answer
637 views

Force Haswell CPU to fixed frequency

For stability of benchmarks I wish to run the E5-2680 v3 2.5 GHz CPUs in my Dell R430 test servers running Fedora 23 at their nominal frequency - no more, no less. I've disabled the intel_pstate ...
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1answer
286 views

AMDGPU CPU Query Frequency

on most CPU you can use "cpufreq-aperf" to check cpu frequency, but I don't think this is compatible with AMDGPU. I did check for "aperf" and found: $ cat /proc/cpuinfo | grep -o "aperf[a-z]*" | ...
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1answer
261 views

What is the unit of this value

I was trying to get frequecy from my device at run time. I used this device node sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq It gave me 60000. I tried this one cat /sys/devices/...
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420 views

Put system in low power mode when idle

I'm trying to build a media player at home using an Odroid XU4 that runs Kodi, which should be always on. However, considering I will not be using it a lot of the time, I would want to put it in a low ...
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1answer
678 views

Does Powersave Mode on the CPU saves power?

I use indicator-cpufreq with Cinnamon to control my CPU-usage and save power, as my battery life has been running low. So, I use indicator-cpufreq to put my CPU in powersave mode. However, I have this ...
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0answers
108 views

Suspend system instead of shutdown on CPU overheat

I have Linux Mint. The system Linux Mint is installed on, shuts down immediately on overheating. Is there anyway the system doesn't shutdown, but goes to standby state? The machine can always be ...
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1answer
1k views

CPU frequency won't go beyond 800MHz on my Dell XPS 13 with ivybridge

I cannot go beyond 800MHz on my Dell XPS 13 Ivybridge CPU. $ cpupower frequency-info analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to ...
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1answer
5k views

RHEL 7 Still CPU Frequency Scaling

When machine is imaged with: RHEL6.x CPU speeds report full 3.3Ghz speed for all CPUs cpupowerutils is not installed RHEL7.x CPU speeds vary (shown in example below) cpupowerutils is installed I ...