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Device or resource busy error when setting EPP #138

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Technical27 opened this issue Dec 8, 2020 · 13 comments · Fixed by #147
Closed

Device or resource busy error when setting EPP #138

Technical27 opened this issue Dec 8, 2020 · 13 comments · Fixed by #147

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@Technical27
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This doesn't happen when it sets governor to "powersave" and EPP to "balance_power"

Error output:

Battery is: charging

Setting to use: "performance" governor
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
Setting to use: "balance_performance" EPP

System information:

-------------------------------------------------------------------------------

Linux distro: NixOS 21.03pre257339.83cbad92d73 okapi
Linux kernel: 5.9.12
Processor: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
Cores: 8
Architecture: x86_64
Driver: intel_pstate

------------------------------ Current CPU states ------------------------------

CPU max frequency: 4000 MHz
CPU min frequency: 400 MHz

	Usage  Temperature  Frequency
CPU0:	 0.0%     56 °C     3976 MHz
CPU1:	 0.0%     54 °C     3913 MHz
CPU2:	 0.0%     55 °C     3995 MHz
CPU3:	 0.0%     53 °C     3932 MHz
CPU4:	 0.0%     56 °C     3954 MHz
CPU5:	 1.0%     54 °C     3768 MHz
CPU6:	 0.0%     55 °C     3971 MHz
CPU7:	 0.0%     53 °C     3722 MHz

Build git commit: ef9be55
Snap package: no

Python: 3.8.6
psutil package: 5.7.3
platform package: 1.0.8
click package: 7.1.2
/nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/sh: pip3: command not found
distro package

Battery is: charging

auto-cpufreq system resource consumption:
cpu usage: 0.0 %
memory use: 0.19 %

Total CPU usage: 1.0 %
Total system load: 0.22
Average temp. of all cores: 54.5 °C 

Currently using: performance governor
Currently turbo boost is: on

-------------------------------------------------------------------------------
@Technical27 Technical27 mentioned this issue Dec 8, 2020
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@Creator54
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Creator54 commented Dec 8, 2020 •
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Could you share your modified source ? i did try to build but had some python related issues and was just testing nixos so didnt gave much thought

in nixos for doing systemwide changes you need to modify the configuration/hardware-configuration.nix file
thus auto-cpufreq would need to change the values via hardware-configuration.nix and do a nixos-rebuild --switch everytime for switching governors
powerManagement.cpuFreqGoverno = lib.mkDefault "powersave";

and ig it does not give the error for powersave because in nixos powersave is set by default.

@Technical27
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powerManagement.cpuFreqGovernor = lib.mkForce null didn't help me.
Nix package and patch here.
The patch disables some copying and the install/removal

@Technical27
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Even weirder, is that it seems to actually change the governor and EPP. The error seems to have no effect.

@AdnanHodzic
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This doesn't happen when it sets governor to "powersave" and EPP to "balance_power"

Error output:

Battery is: charging

Setting to use: "performance" governor
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
Setting to use: "balance_performance" EPP

I've never seen an error like this, but I think it might be related to NixOS itself and its packing? I'm saying this because for auto-cpufreq to work in Snap strictly confined mode, changes had to be made to snapd itself.

Maybe something similar has to be done here?

@Technical27
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NixOS doesn't limit programs and what they can do with the exectiption that /nix/store is readonly so, programs cannot modify their own binaries, libs, etc.
That is why I used a patch to prevent scripts/cpufreqctl.sh from being copied and to disable installing.

I am currently using TLP and that can modify the govenor and cpu frequencies perfectly.
auto-cpufreq works fine and it did change the governor/EPP even when the error shows.

@AdnanHodzic
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auto-cpufreq works fine and it did change the governor/EPP even when the error shows.

In that case maybe simply hide

/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy

output?

@Creator54
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Creator54 commented Dec 9, 2020 •
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powerManagement.cpuFreqGovernor = lib.mkForce null didn't help me.
Nix package and patch here.
The patch disables some copying and the install/removal

Could you explain how I could test this in my nix system I am bit of a noob 😅
I did try to include this in my configuration.nix but got issues .

Also why powerManagement.cpuFreqGovernor = lib.mkForce null why this is null ?

@Creator54
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Creator54 commented Dec 9, 2020 •
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This doesn't happen when it sets governor to "powersave" and EPP to "balance_power"

Error output:

Battery is: charging

Setting to use: "performance" governor
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
/nix/store/85r01271896mbwklcgwjig6xarz1kwrr-python3.8-auto-cpufreq-1.5.1/bin/cpufreqctl: line 267: echo: write error: Device or resource busy
Setting to use: "balance_performance" EPP

I've never seen an error like this, but I think it might be related to NixOS itself and its packing? I'm saying this because for auto-cpufreq to work in Snap strictly confined mode, changes had to be made to snapd itself.

Maybe something similar has to be done here?

Yes, It's because nixos only allows system wide changes when done with /etc/nixos/configuration.nix file .

@freshgiammi
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freshgiammi commented Dec 14, 2020 •
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This issue might not be caused by NixOS. I've replicated (actually, had since I started using auto-cpufreq) this same issue on Arch running on a XPS 9500. Fairly sure it's not something in my configuration as well, as this has appened after a clean install.

/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata
/usr/bin/cpufreqctl: riga 267: echo: errore in scrittura: Dispositivo o risorsa occupata

auto-cpufreq --debug

-------------------------------------------------------------------------------

Linux distro: Arch Linux rolling n/a
Linux kernel: 5.9.14-arch1-1
Processor: Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
Cores: 12
Architecture: x86_64
Driver: intel_pstate

------------------------------ Current CPU states ------------------------------

CPU max frequency: 5000 MHz
CPU min frequency: 800 MHz

	 Usage  Temperature  Frequency
CPU0:	  0.0%     56 °C     4239 MHz
CPU1:	  2.9%     57 °C     4661 MHz
CPU2:	  0.0%     55 °C     4910 MHz
CPU3:	  2.0%     57 °C     4817 MHz
CPU4:	  1.0%     56 °C     4748 MHz
CPU5:	  1.0%     56 °C     4666 MHz
CPU6:	  0.0%     56 °C     4756 MHz
CPU7:	  1.0%     57 °C     4797 MHz
CPU8:	  0.0%     55 °C     4852 MHz
CPU9:	  0.0%     57 °C     4797 MHz
CPU10:	  1.0%     56 °C     4783 MHz
CPU11:	  0.0%     56 °C     4699 MHz

fatal: .git non è un repository Git (né lo è alcuna delle directory genitrici)
Snap package: no

Python: 3.9.0
psutil package: 5.7.3
platform package: 1.0.8
click package: 7.1.2
distro package 1.5.0

Battery is: charging

auto-cpufreq system resource consumption:
cpu usage: 0.0 %
memory use: 0.1 %

Total CPU usage: 0.8 %
Total system load: 0.52
Average temp. of all cores: 56.166666666666664 °C 

Currently using: performance governor
Currently turbo boost is: on

-------------------------------------------------------------------------------

On my side though, governor is changing but EPP isn't, as reported by the error message.

[freshgiammi@xps9500 ~]$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
[freshgiammi@xps9500 ~]$ cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference 
performance
[freshgiammi@xps9500 ~]$ cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences 
default performance balance_performance balance_power power

@ghost
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ghost commented Jan 3, 2021 •
edited by ghost
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@AdnanHodzic This is related to the implementation of hardware managed performance states (HWP) in intel_pstates. If HWP is activated and the performance governor is selected the EPP value is overwritten with a 0 (performance) and made read only. [1]

You could implement a simple if condition that checks if /sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost, which is only present if HWP is enabled, exists and if so, skips setting /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference .[2]

@AdnanHodzic
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@likeadoc thanks for clarification and heads up! Since I'm very busy at the moment, if you or anyone else in this report could make these changes and create a PR, I would greatly appreciate it. If anything, your contribution would be listed on releases page.

Otherwise, you can wait until I make these changes, but I'm really not sure when I'll be able to do so.

@AdnanHodzic AdnanHodzic mentioned this issue Jan 8, 2021
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@Technical27 Technical27 changed the title Device or resource busy error when setting governor/EPP Device or resource busy error when setting EPP Jan 12, 2021
@freshgiammi freshgiammi mentioned this issue Jan 17, 2021
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@freshgiammi
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Did a small change that has been running without issues for a couple of days on my end, so I forked and opened a PR. All works fine on my XPS 9500 (i7-10750H), YMMV but it really shouldn't.
Those interested should try it.

AdnanHodzic pushed a commit that referenced this issue Jan 17, 2021
@freshgiammi
Disable setting EPP if HWP is active and governor is set to "performa…
19886a4 
…nce" (#138) (#147)

This fixes #138. Thanks to @likeadoc for pointing out the reason for this behavior.
#138 (comment)
@AdnanHodzic
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Changed mentioned by @freshgiammi are also live as part of auto-cpufreq 1.5.2 release.

@TheChilledBuffalo TheChilledBuffalo mentioned this issue Jun 20, 2024
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Disable setting EPP if HWP is active and governor is set to "performance" (#138)
4 participants
@AdnanHodzic @freshgiammi @Creator54 @Technical27