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Diffstat (limited to 'kernel/Kconfig.hz')
-rw-r--r-- | kernel/Kconfig.hz | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz new file mode 100644 index 000000000000..248e1c396f8b --- /dev/null +++ b/kernel/Kconfig.hz | |||
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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. | ||
32 | |||
33 | config HZ_1000 | ||
34 | bool "1000 HZ" | ||
35 | help | ||
36 | 1000 HZ is the preferred choice for desktop systems and other | ||
37 | systems requiring fast interactive responses to events. | ||
38 | |||
39 | endchoice | ||
40 | |||
41 | config HZ | ||
42 | int | ||
43 | default 100 if HZ_100 | ||
44 | default 250 if HZ_250 | ||
45 | default 1000 if HZ_1000 | ||
46 | |||