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_12
  18. bool "12 HZ"
  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. config HZ_250
  26. bool "250 HZ"
  27. help
  28. 250 Hz is a good compromise choice allowing server performance
  29. while also showing good interactive responsiveness even
  30. on SMP and NUMA systems. If you are going to be using NTSC video
  31. or multimedia, selected 300Hz instead.
  32. config HZ_300
  33. bool "300 HZ"
  34. help
  35. 300 Hz is a good compromise choice allowing server performance
  36. while also showing good interactive responsiveness even
  37. on SMP and NUMA systems and exactly dividing by both PAL and
  38. NTSC frame rates for video and multimedia work.
  39. config HZ_1000
  40. bool "1000 HZ"
  41. help
  42. 1000 Hz is the preferred choice for desktop systems and other
  43. systems requiring fast interactive responses to events.
  44. endchoice
  45. config HZ
  46. int
  47. default 12 if HZ_12
  48. default 100 if HZ_100
  49. default 250 if HZ_250
  50. default 300 if HZ_300
  51. default 1000 if HZ_1000
  52. config SCHED_HRTICK
  53. def_bool HIGH_RES_TIMERS