Selecting tuned Configurations

Principles

tuned is a service for the Linux system. It provides the configuration file adjustment mechanism to tune the system settings based on the system status. tuned-adm is a tool that cooperates with the tuned service. tuned-adm is preconfigured with multiple system parameter configuration files, which can adapt to different services by adjusting parameters such as the scheduling time, dirty page flush watermark, and CPU performance mode.

You can select different configurations based on service requirements. For example:

To achieve low latency, select the network-latency mode.
To achieve high network I/O throughput, select the network-throughput mode.
To achieve low I/O latency, select the latency-performance mode.
To achieve high I/O throughput, select the throughput-performance mode.

Modification Method

Installation method:

1	# yum install tuned

Table 1 and Table 2 list common tuned commands and modes.

**Table 1** Common tuned commands
Description	Command
Views the tuned service running status.	systemctl status tuned
Checks the current tuned mode.	tuned-adm active
Checks supported tuned modes.	tuned-adm list
Sets a tuned mode.	tuned-adm profile $config
Cancels a tuned mode.	tuned-adm off

**Table 2** Common tuned modes
Mode	Description
balanced	Balance mode
latency-performance	Low I/O latency mode
network-latency	Low network latency mode
network-throughput	High network throughput mode
throughput-performance	High I/O throughput mode
powersave	Power saving mode

The configuration files used by tuned is stored in /usr/lib/tuned. You can also refer to the kernel configuration parameters to tune the system.

Parent topic: Optimization Methods