RHCSA - Operate Running Systems: Manage Tuning Profiles

The tuned daemon and a set of utilities allow allow you to optimize your system's performance based on different profiles. These profiles are predefined configurations that tune various kernel and system settings to best suit specific workloads or use cases.

Tuning Profiles

The below table shows the tuning profiles that should be available on your system:

Profile	Description
accelerator-performance	Throughput performance based tuning with disabled higher latency STOP states
aws	Optimize for AWS EC2 instances
balanced	General non-specialized tuned profile
desktop	Optimize for the desktop use-case
hpc-compute	Optimize for HPC compute workloads
intel-sst	Configure for Intel Speed Select Base Frequency
latency-performance	Optimize for deterministic performance at the cost of increased power consumption
network-latency	Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network ormance
network-throughput	Optimize for streaming network throughput, generally only necessary on older CPUs or 40G+ networks
optimize-serial-console	Optimize for serial console use
powersave	Optimize for low power consumption
throughput-performance	Broadly applicable tuning that provides excellent performance across a variety of common server workloads
virtual-guest	Optimize for running inside a virtual guest
virtual-host	Optimize for running KVM guests

Enable & Start tuned

The tuned daemon may not be enabled or running by default so you will need to check and correct this before being able to use tuning profiles.

Enable and start tuned:

Ensure the tuned service is enabled and running:

sudo systemctl enable --now tuned

Check the service status shows as active (running):

systemctl status tuned

Output should look similar to:

- tuned.service - Dynamic System Tuning Daemon
     Loaded: loaded (/usr/lib/systemd/system/tuned.service; enabled; preset: enabled)
     Active: active (running) since Mon 2023-07-24 08:14:04 BST; 1s ago
       Docs: man:tuned(8)
            man:tuned.conf(5)
            man:tuned-adm(8)
   Main PID: 3913 (tuned)
      Tasks: 4 (limit: 48714)
     Memory: 15.8M
        CPU: 284ms
     CGroup: /system.slice/tuned.service
             |-- 3913 /usr/bin/python3 -Es /usr/sbin/tuned -l -P

Jul 24 08:14:04 rhcsa-install.home.arpa systemd[1]: Starting Dynamic System Tuning Daemon...
Jul 24 08:14:04 rhcsa-install.home.arpa systemd[1]: Started Dynamic System Tuning Daemon.

tuned-adm Command

The tuned-adm command line tool is used for switching between different tuning profiles. Some of the common options are:

list: List all available profiles.
active: Show current active profile.
profile [profile_name]...: Switches to the given profile. If more than one profile is given, the profiles are merged (in case of conflicting settings, the setting from the last profile is used) and the resulting profile is applied.
recommend: Recommends a profile suitable for your system.
auto_profile: Enable automatic profile selection mode, switch to the recommended profile.

tuned-adm exercises

List the available profiles:

tuned-adm list

The output should display the profiles detailed in section Tuning Profiles above.

Display the currently active profile:

tuned-adm active

Command output example:

Current active profile: virtual-guest

Change the active profile:

sudo tuned-adm profile latency-performance

Confirm the active profile has changed:

tuned-adm active

Command output example:

Current active profile: latency-performance

Display the recommended tuning profile:

tuned-adm recommend

Output example:

virtual-guest

Enable automatic profile selection:

sudo tuned-adm auto_profile

Confirm the active profile has changed to the recommended tuning profile:

tuned-adm active

Command output example:

Current active profile: virtual-guest

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