Set Linux CPU Governor to Schedutil

The schedutil governor is often the best choice for modern kernels, using scheduler utilization data to make faster and more accurate frequency decisions than older governors like ondemand.

Here is how to enable it and make it persistent.

1. Install Tools

First, ensure you have the necessary tools installed. On Ubuntu/Debian:

sudo apt update
sudo apt install linux-tools-common linux-tools-generic

2. Set Governor (Immediate)

You can set the governor immediately for the current session. It’s good practice to set the frequency limits as well.

sudo cpupower frequency-set -g schedutil
# Optional: explicitly set limits if needed, though usually automatic
# sudo cpupower frequency-set -g powersave
# sudo cpupower frequency-set -g performance

Verify

Check if the policy has been applied:

cpupower frequency-info | grep "current policy" -A2

You should see output similar to:

current policy: frequency should be within 1.20 GHz and 3.60 GHz.
                The governor "schedutil" may decide which speed to use

To double-check individual CPUs:

grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

All cores should report schedutil.

3. Make Persistent (Systemd)

To ensure this setting survives a reboot, create a simple systemd service.

Create the service file:

sudo tee /etc/systemd/system/cpupower-schedutil.service >/dev/null << 'EOF'
[Unit]
Description=Set CPU governor to schedutil
After=multi-user.target

[Service]
Type=oneshot
ExecStart=/usr/bin/cpupower frequency-set -g schedutil

[Install]
WantedBy=multi-user.target
EOF

Enable and start the service:

sudo systemctl daemon-reload
sudo systemctl enable cpupower-schedutil.service
sudo systemctl start cpupower-schedutil.service

After starting, run the verification command again to confirm it’s working.

4. Cleanup (Optional)

If you previously created a service for high performance (e.g., cpupower-performance.service), you should disable and remove it to avoid conflicts.

sudo systemctl disable --now cpupower-performance.service
sudo rm /etc/systemd/system/cpupower-performance.service
sudo systemctl daemon-reload

Your server is now configured to use schedutil automatically on every boot.