Kconfig.hz 1.7 KB

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  1. # SPDX-License-Identifier: GPL-2.0-only
  2. #
  3. # Timer Interrupt Frequency Configuration
  4. #
  5. choice
  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. config HZ_100
  18. bool "100 HZ"
  19. help
  20. 100 Hz is a typical choice for servers, SMP and NUMA systems
  21. with lots of processors that may show reduced performance if
  22. too many timer interrupts are occurring.
  23. config HZ_250
  24. bool "250 HZ"
  25. help
  26. 250 Hz is a good compromise choice allowing server performance
  27. while also showing good interactive responsiveness even
  28. on SMP and NUMA systems. If you are going to be using NTSC video
  29. or multimedia, selected 300Hz instead.
  30. config HZ_300
  31. bool "300 HZ"
  32. help
  33. 300 Hz is a good compromise choice allowing server performance
  34. while also showing good interactive responsiveness even
  35. on SMP and NUMA systems and exactly dividing by both PAL and
  36. NTSC frame rates for video and multimedia work.
  37. config HZ_1000
  38. bool "1000 HZ"
  39. help
  40. 1000 Hz is the preferred choice for desktop systems and other
  41. systems requiring fast interactive responses to events.
  42. endchoice
  43. config HZ
  44. int
  45. default 100 if HZ_100
  46. default 250 if HZ_250
  47. default 300 if HZ_300
  48. default 1000 if HZ_1000
  49. config SCHED_HRTICK
  50. def_bool HIGH_RES_TIMERS