tuned

tuned [options]tuned-adm command [arguments]

tuned is a daemon that monitors system usage and dynamically adjusts system settings to optimize performance. It uses profiles that configure CPU governors, disk I/O schedulers, kernel parameters, and power management settings.The daemon can operate in static mode (applying fixed settings from a profile) or dynamic mode (adjusting settings based on real-time system activity). Profiles are stored in /etc/tuned/ and /usr/lib/tuned/.Management is done through tuned-adm, which communicates with the daemon to switch profiles and query status. Custom profiles can be created by extending existing ones or defining new tuning rules.

/etc/tuned/tuned-main.conf

Main daemon configuration controlling dynamic tuning, update interval, and logging.

Custom profile definitions with kernel, disk, and CPU tuning parameters.

System-provided default profiles directory.

balanced: General purpose; balances performance and power.throughput-performance: Maximum throughput for servers.latency-performance: Minimize latency for real-time workloads.powersave: Reduce power consumption.virtual-guest: Optimized for virtual machine guests.virtual-host: Optimized for hypervisor hosts.network-latency: Low latency network tuning.network-throughput: High network throughput.

list: Show available profiles.active: Display currently active profile.profile name: Activate specified profile.recommend: Suggest optimal profile for system.off: Disable all tuning.verify: Check if current settings match profile.

Dynamic tuning is disabled by default on RHEL. Profile changes take effect immediately but don't persist reboots without enabling the service. Some settings may conflict with other system management tools.

tuned was developed by Red Hat for enterprise Linux systems to simplify performance optimization. It evolved from manual kernel tuning practices into an automated system that applies best practices based on workload type, reducing the expertise required for system optimization.

tuned-adm(8), cpupower(1), sysctl(8), ionice(1)