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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 248e1c396f8..4af15802ccd 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -7,7 +7,7 @@ choice
default HZ_250
help
Allows the configuration of the timer frequency. It is customary
- to have the timer interrupt run at 1000 HZ but 100 HZ may be more
+ to have the timer interrupt run at 1000 Hz but 100 Hz may be more
beneficial for servers and NUMA systems that do not need to have
a fast response for user interaction and that may experience bus
contention and cacheline bounces as a result of timer interrupts.
@@ -19,21 +19,30 @@ choice
config HZ_100
bool "100 HZ"
help
- 100 HZ is a typical choice for servers, SMP and NUMA systems
+ 100 Hz is a typical choice for servers, SMP and NUMA systems
with lots of processors that may show reduced performance if
too many timer interrupts are occurring.
config HZ_250
bool "250 HZ"
help
- 250 HZ is a good compromise choice allowing server performance
+ 250 Hz is a good compromise choice allowing server performance
while also showing good interactive responsiveness even
- on SMP and NUMA systems.
+ on SMP and NUMA systems. If you are going to be using NTSC video
+ or multimedia, selected 300Hz instead.
+
+ config HZ_300
+ bool "300 HZ"
+ help
+ 300 Hz is a good compromise choice allowing server performance
+ while also showing good interactive responsiveness even
+ on SMP and NUMA systems and exactly dividing by both PAL and
+ NTSC frame rates for video and multimedia work.
config HZ_1000
bool "1000 HZ"
help
- 1000 HZ is the preferred choice for desktop systems and other
+ 1000 Hz is the preferred choice for desktop systems and other
systems requiring fast interactive responses to events.
endchoice
@@ -42,5 +51,6 @@ config HZ
int
default 100 if HZ_100
default 250 if HZ_250
+ default 300 if HZ_300
default 1000 if HZ_1000