Sp1derman
DD-WRT User
Joined: 16 Jun 2006
Posts: 223
Location: Germany, BW
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 Posted: Tue Sep 03, 2024 18:58 Post subject: [INFO] -- CPU-Cores running in Turbo-Mode 24/7 |
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newest Build while writing this Info: 58283
Since a few Builds the CPU is nonstop running in Turbo-Mode.
That happens because of the cpufreq-Governor is set to "performance".
In former Builds the Gopvernor was set to "schedutil".
You can check your active Governor with this command, it shows the Info for all Cores: | Code: | root@WLAN-AP1:~# cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_governor
ondemand
ondemand
ondemand
ondemand |
To see the Gonernors available on your system: | Code: | root@WLAN-AP1:~# cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_available_governors
ondemand userspace powersave performance schedutil
ondemand userspace powersave performance schedutil
ondemand userspace powersave performance schedutil
ondemand userspace powersave performance schedutil |
To solve this issue flood404 posted in some Topics the code to switch the Governor from "performance" to "ondemand".
The ondemand-Governor seems to be a really good solution, I did some tests and after these tests I also switched to ondemand on systems running with schedutil.
Here is the code posted by flood404: | Code: | | for CPUGOV in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUGOV ] || continue; echo -n ondemand > $CPUGOV; done |
You can also use: | Code: | | cpupower frequency-set -g ondemand |
To prevent the CPU in Load-situation to jump up with the MHz too early here additional code: | Code: | echo 55 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
echo 15 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor |
I set the value to 55 as our Intel-CPUs are so powerful, there is no need to increase MHz earlier. In some other posts the Value is about 35.
So my code in the Startup-script is: | Code: | cpupower frequency-set -g ondemand
echo 55 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
echo 15 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor |
To get some Infos about the CPU/Cores: | Code: | cpupower frequency-info
cat /proc/cpuinfo
grep -e processor -e MHz /proc/cpuinfo
grep -m 1 -e 'model name' /proc/cpuinfo && grep -e processor -e MHz /proc/cpuinfo |
To monitor the CPU-Clock in 2-second-intervall: | Code: | watch grep -e processor -e MHz /proc/cpuinfo
watch cat /sys/devices/system/cpu/cpu[0-9]*/cpufreq/scaling_cur_freq |
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