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-rw-r--r--kernel/Kconfig.hz20
1 files changed, 15 insertions, 5 deletions
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz
index 248e1c396f8b..4af15802ccd4 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -7,7 +7,7 @@ choice
7 default HZ_250 7 default HZ_250
8 help 8 help
9 Allows the configuration of the timer frequency. It is customary 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 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 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 12 a fast response for user interaction and that may experience bus
13 contention and cacheline bounces as a result of timer interrupts. 13 contention and cacheline bounces as a result of timer interrupts.
@@ -19,21 +19,30 @@ choice
19 config HZ_100 19 config HZ_100
20 bool "100 HZ" 20 bool "100 HZ"
21 help 21 help
22 100 HZ is a typical choice for servers, SMP and NUMA systems 22 100 Hz is a typical choice for servers, SMP and NUMA systems
23 with lots of processors that may show reduced performance if 23 with lots of processors that may show reduced performance if
24 too many timer interrupts are occurring. 24 too many timer interrupts are occurring.
25 25
26 config HZ_250 26 config HZ_250
27 bool "250 HZ" 27 bool "250 HZ"
28 help 28 help
29 250 HZ is a good compromise choice allowing server performance 29 250 Hz is a good compromise choice allowing server performance
30 while also showing good interactive responsiveness even 30 while also showing good interactive responsiveness even
31 on SMP and NUMA systems. 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.
32 41
33 config HZ_1000 42 config HZ_1000
34 bool "1000 HZ" 43 bool "1000 HZ"
35 help 44 help
36 1000 HZ is the preferred choice for desktop systems and other 45 1000 Hz is the preferred choice for desktop systems and other
37 systems requiring fast interactive responses to events. 46 systems requiring fast interactive responses to events.
38 47
39endchoice 48endchoice
@@ -42,5 +51,6 @@ config HZ
42 int 51 int
43 default 100 if HZ_100 52 default 100 if HZ_100
44 default 250 if HZ_250 53 default 250 if HZ_250
54 default 300 if HZ_300
45 default 1000 if HZ_1000 55 default 1000 if HZ_1000
46 56