Root/kernel/Kconfig.hz

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
59

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