# SPDX-License-Identifier: GPL-2.0-only # # Timer Interrupt Frequency Configuration # choice prompt "Timer frequency" default HZ_250 help Allows the configuration of the timer frequency. It is customary to have the timer interrupt run at 1000 Hz but 100 Hz may be more beneficial for servers and NUMA systems that do not need to have a fast response for user interaction and that may experience bus contention and cacheline bounces as a result of timer interrupts. Note that the timer interrupt occurs on each processor in an SMP environment leading to NR_CPUS * HZ number of timer interrupts per second. config HZ_100 bool "100 HZ" help 100 Hz is a typical choice for servers, SMP and NUMA systems with lots of processors that may show reduced performance if too many timer interrupts are occurring. config HZ_250 bool "250 HZ" help 250 Hz is a good compromise choice allowing server performance while also showing good interactive responsiveness even on SMP and NUMA systems. If you are going to be using NTSC video or multimedia, selected 300Hz instead. config HZ_300 bool "300 HZ" help 300 Hz is a good compromise choice allowing server performance while also showing good interactive responsiveness even on SMP and NUMA systems and exactly dividing by both PAL and NTSC frame rates for video and multimedia work. config HZ_1000 bool "1000 HZ" help 1000 Hz is the preferred choice for desktop systems and other systems requiring fast interactive responses to events. endchoice config HZ int default 100 if HZ_100 default 250 if HZ_250 default 300 if HZ_300 default 1000 if HZ_1000 config SCHED_HRTICK def_bool HIGH_RES_TIMERS