cpufreq

ls -l /sys/devices/system/cpu/cpu0/cpufreq/
-r--r--r-- 1 root root 4096 lis 14 12:18 affected_cpus             0
-r--r--r-- 1 root root 4096 lis 14 13:08 bios_limit                3400000
-rw-r--r-- 1 root root 4096 lis 14 13:08 cpb
-r-------- 1 root root 4096 lis 14 12:46 cpuinfo_cur_freq
-r--r--r-- 1 root root 4096 lis 14 12:18 cpuinfo_max_freq
-r--r--r-- 1 root root 4096 lis 14 12:18 cpuinfo_min_freq
-r--r--r-- 1 root root 4096 lis 14 12:46 cpuinfo_transition_latency
-r--r--r-- 1 root root 4096 lis 14 13:08 freqdomain_cpus
-r--r--r-- 1 root root 4096 lis 14 12:46 related_cpus
-r--r--r-- 1 root root 4096 lis 14 12:18 scaling_available_frequencies
-r--r--r-- 1 root root 4096 lis 14 12:18 scaling_available_governors
-r--r--r-- 1 root root 4096 lis 14 12:46 scaling_cur_freq          1400000
-r--r--r-- 1 root root 4096 lis 14 12:46 scaling_driver            acpi-cpufreq
-rw-r--r-- 1 root root 4096 lis 14 12:19 scaling_governor          userspace
-rw-r--r-- 1 root root 4096 lis 14 12:47 scaling_max_freq
-rw-r--r-- 1 root root 4096 lis 14 12:47 scaling_min_freq
-rw-r--r-- 1 root root 4096 lis 14 13:08 scaling_setspeed
drwxr-xr-x 2 root root    0 lis 14 12:20 stats

List current governors:

cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor

cpufreqd.service                                                                                      loaded active running   LSB: start and stop cpufreqd
cpufrequtils.service                                                                                  loaded active exited    LSB: set CPUFreq kernel parameters
loadcpufreq.service                                                                                   loaded active exited    LSB: Load kernel modules needed to enable cpufreq scaling

/etc/init.d/cpufreqd
/etc/init.d/cpufrequtils
/etc/init.d/loadcpufreq

Fully configurable daemon for dynamic frequency and voltage scaling

/etc/cpufreqd.conf
/etc/default/cpufreqd

It provides:

• /etc/init.d/cpufrequtils - disabled by default (no file ``/etc/default/cpufrequtils``)
• /etc/init.d/loadcpufreq - loads kernel modules
• cpufreq-set
• cpufreq-info
• cpufreq-aperf

utilities to deal with the cpufreq Linux kernel feature This package contains two utilities for inspecting and setting the CPU frequency through both the sysfs and procfs CPUFreq kernel interfaces. . By default, it also enables CPUFreq at boot time if the correct CPU driver is found.

/etc/default/cpufrequtils

for ((i=0;i<$(nproc);i++)); do cpufreq-set -c $i -r -g powersave; done

Ansible one liner:

(cd .. && ansible pves -i $INVENTORY -a "bash -c 'for ((i=0;i<\$(nproc);i++)); do cpufreq-set -c \$i -r -g powersave; done'" --become)