Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/kernel/Kconfig.hz

  1 #
  2 # Timer Interrupt Frequency Configuration
  3 #
  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 
 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 
 48 endchoice
 49 
 50 config 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 
 57 config SCHED_HRTICK
 58         def_bool HIGH_RES_TIMERS

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us