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CONFIG_NO_HZ_FULL: Full dynticks system (tickless)

General informations

The Linux kernel configuration item CONFIG_NO_HZ_FULL:

Help text

Adaptively try to shutdown the tick whenever possible, even when the CPU is running tasks. Typically this requires running a single task on the CPU. Chances for running tickless are maximized when the task mostly runs in userspace and has few kernel activity.

You need to fill up the nohz_full boot parameter with the desired range of dynticks CPUs.

This is implemented at the expense of some overhead in user <-> kernel transitions: syscalls, exceptions and interrupts. Even when it's dynamically off.

Say N.

Hardware

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