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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:
virtual-guest
Based on the throughput-performance profile, virtual-guest also decreases the swappiness of virtual memory.
The virtual-guest profile is automatically selected when creating a Red Hat Enterprise Linux 7 guest virtual machine. It is the recommended profile for virtual machines.
This profile is available in Red Hat Enterprise Linux 6.3 and later, but must be manually selected when installing a virtual machine.
virtual-host
Based on the throughput-performance profile, virtual-host also enables more aggressive writeback of dirty pages. This profile is the recommended profile for virtualization hosts, including both KVM and Red Hat Virtualization (RHV) hosts.
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
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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
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To switch to one of the available profiles, run: 
tuned-adm profile profile_nametuned-adm profile profile_name
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For example, to switch to the virtual-host profile, run: 
tuned-adm profile virtual-host
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Important

After setting a tuned profile in Red Hat Enterprise Linux 7.1 and above, make sure the tuned service is enabled for the configured profile to be applied after a reboot: 
# systemctl enable tuned
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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
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To permanently disable tuned and revert all changes it performed, run: 
# tuned-adm off; systemctl disable tuned
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Note

For further information about tuned, see the Red Hat Enterprise Linux 7 Performance Tuning Guide.
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