limit CPU performance?

nex86 · 26. Oktober 2019

is there a way to limit the CPU performance for example using Intel Speedstep to limit the CPU to a minimal frequency ?
I'm sure the Linux Kernel can do this by default by changing values like max_freq or governor in the systree but can this be set through the web interface?
I don't really want the CPU to consume too much if I don't really need all its power for simple things like file transfer etc..

And the bios also doesn't have much options since its a Dell Optiplex, I can only enable or disable turboboost or speedstep, but not manually edit the clock speed.

Adoby · 26. Oktober 2019

You should be able to write scripts that change CPU freq and governor. And the run these scripts as tasks from the web GUI.

But why not simply use the ondemand governor with low min and high max freq? Then it should be self regulated and work as you want it by itself.

nex86 · 26. Oktober 2019

might probably do that but I was wondering if there was a plugin to freely change this as graphical settings in the web interface.
I could make one though if I knew how... how does the interface work php/css/js?

Adoby · 26. Oktober 2019

No idea. But is there really any need to mess with it?

I just checked one of my OMV NAS. Odroid HC2. It is already, by default, set up with ondemand and low min and high max. I'm fine with that.

adoby@nas0:~$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
ondemand
ondemand
ondemand
ondemand
ondemand
ondemand
ondemand
ondemand
adoby@nas0:~$ cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_min_freq
200000
200000
200000
200000
200000
200000
200000
200000
adoby@nas0:~$ cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_max_freq
1500000
1500000
1500000
1500000
2000000
2000000
2000000
2000000
adoby@nas0:~$

nex86 · 26. Oktober 2019

yea I'm runing an i5 3470 and it uses up to 80w or more on load and I don't need all the performance all the time.

ryecoaaron · 26. Oktober 2019

There is no need to write a plugin. There is already cpufrequtil code in OMV. Just set the following settings in /etc/default/openmediavault

OMV_CPUFREQUTILS_GOVERNOR="ondemand" or whatever governor you want
OMV_CPUFREQUTILS_MINSPEED="600000" or whatever minimum speed you want
OMV_CPUFREQUTILS_MAXSPEED="900000" or whatever maximum speed you want

and then
omv-mkconf cpufrequtils on omv 4.x
omv-salt deploy run cpufrequtils on omv 5.x

nex86 · 26. Oktober 2019

thanks that should help a lot.

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