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