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oam/knowledge base/check or set the cpu frequency or governor.md
Michele Cereda 1ad0a14648 chore: better knowledge in the quest for power efficiency
2024-01-12 20:53:50 +01:00

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Check or set the CPU frequency or governor

  1. TL;DR
  2. Further readings
  3. Sources

TL;DR

# Check what governors are available.
cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_available_governors'

# Get the current active governor.
cat '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor'
cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_governor'

# List the active CPUs affected by the current governor.
cat '/sys/devices/system/cpu/cpufreq/'*'/affected_cpus'

# Enable new governors.
echo 'schedutil' | sudo tee '/sys/devices/system/cpu/cpufreq/policy0/scaling_governor'
echo 'powersave' | sudo tee '/sys/devices/system/cpu/cpufreq/policy1/scaling_governor'

# Get the current frequency of CPUs.
cat '/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq'
cat '/sys/devices/system/cpu/cpufreq/'*'/scaling_cur_freq'

# Do not boost the CPU frequency for niced loads.
# The governor must support it - check if the file exists.
echo 1 | sudo tee '/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load'

# Disable (1) or enable (0) turbo boost for Intel CPUs.
echo 1 | sudo tee '/sys/devices/system/cpu/intel_pstate/no_turbo'

# Check what energy vs performance hint are available for CPUs.
cat '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences'

# Get the current energy vs performance hint used by CPUs.
cat '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference'
cat '/sys/devices/system/cpu/cpu'*'/cpufreq/energy_performance_preference'

# Set energy vs performance hints.
echo 'balance_performance' | sudo tee '/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference'
echo 'power' | sudo tee '/sys/devices/system/cpu/cpu'*'/cpufreq/energy_performance_preference'

Further readings

Sources

All the references in the further readings section, plus the following: