Chapter 4. tuned and tuned-adm

This chapter covers using the tuned daemon for tuning system settings in virtualized environments.

tuned is a tuning profile delivery mechanism that adapts Red Hat Enterprise Linux for certain workload characteristics, such as requirements for CPU-intensive tasks, or storage/network throughput responsiveness. It provides a number of tuning profiles that are pre-configured to enhance performance and reduce power consumption in a number of specific use cases. Edit these profiles or create new profiles to create performance solutions tailored to your environment.

The virtualization-related profiles provided as part of tuned include:

By default in a Red Hat Enterprise Linux 7 installation, the tuned package is installed and the tuned service is enabled.

To list all available profiles and identify the current active profile, run:

# tuned-adm list
Available profiles:
- balanced
- desktop
- latency-performance
- network-latency
- network-throughput
- powersave
- sap
- throughput-performance
- virtual-guest
- virtual-host
Current active profile: throughput-performance

It is also possible to create custom tuned profiles to encapsulate a set of tuning parameters. For instructions on creating custom tuned profiles, see the tuned.conf man page.

To only display the currently active profile, run:

tuned-adm active

To switch to one of the available profiles, run:

tuned-adm profile profile_name

For example, to switch to the virtual-host profile, run:

tuned-adm profile virtual-host

# systemctl enable tuned

In some cases, it is preferable to disable tuned to use parameters set manually. To disable all tuning for the current session, run:

# tuned-adm off

To permanently disable tuned and revert all changes it performed, run:

# tuned-adm off; systemctl disable tuned