linux/kernel/Kconfig.hz
<<
>>
Prefs
   1# SPDX-License-Identifier: GPL-2.0-only
   2#
   3# Timer Interrupt Frequency Configuration
   4#
   5
   6choice
   7        prompt "Timer frequency"
   8        default HZ_250
   9        help
  10         Allows the configuration of the timer frequency. It is customary
  11         to have the timer interrupt run at 1000 Hz but 100 Hz may be more
  12         beneficial for servers and NUMA systems that do not need to have
  13         a fast response for user interaction and that may experience bus
  14         contention and cacheline bounces as a result of timer interrupts.
  15         Note that the timer interrupt occurs on each processor in an SMP
  16         environment leading to NR_CPUS * HZ number of timer interrupts
  17         per second.
  18
  19
  20        config HZ_100
  21                bool "100 HZ"
  22        help
  23          100 Hz is a typical choice for servers, SMP and NUMA systems
  24          with lots of processors that may show reduced performance if
  25          too many timer interrupts are occurring.
  26
  27        config HZ_250
  28                bool "250 HZ"
  29        help
  30         250 Hz is a good compromise choice allowing server performance
  31         while also showing good interactive responsiveness even
  32         on SMP and NUMA systems. If you are going to be using NTSC video
  33         or multimedia, selected 300Hz instead.
  34
  35        config HZ_300
  36                bool "300 HZ"
  37        help
  38         300 Hz is a good compromise choice allowing server performance
  39         while also showing good interactive responsiveness even
  40         on SMP and NUMA systems and exactly dividing by both PAL and
  41         NTSC frame rates for video and multimedia work.
  42
  43        config HZ_1000
  44                bool "1000 HZ"
  45        help
  46         1000 Hz is the preferred choice for desktop systems and other
  47         systems requiring fast interactive responses to events.
  48
  49endchoice
  50
  51config HZ
  52        int
  53        default 100 if HZ_100
  54        default 250 if HZ_250
  55        default 300 if HZ_300
  56        default 1000 if HZ_1000
  57
  58config SCHED_HRTICK
  59        def_bool HIGH_RES_TIMERS
  60