mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 17:51:43 +00:00
47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
|
#
|
||
|
|
# Timer Interrupt Frequency Configuration
|
||
|
|
#
|
||
|
|
|
||
|
|
choice
|
||
|
|
prompt "Timer frequency"
|
||
|
|
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
|
||
|
|
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.
|
||
|
|
Note that the timer interrupt occurs on each processor in an SMP
|
||
|
|
environment leading to NR_CPUS * HZ number of timer interrupts
|
||
|
|
per second.
|
||
|
|
|
||
|
|
|
||
|
|
config HZ_100
|
||
|
|
bool "100 HZ"
|
||
|
|
help
|
||
|
|
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
|
||
|
|
while also showing good interactive responsiveness even
|
||
|
|
on SMP and NUMA systems.
|
||
|
|
|
||
|
|
config HZ_1000
|
||
|
|
bool "1000 HZ"
|
||
|
|
help
|
||
|
|
1000 HZ is the preferred choice for desktop systems and other
|
||
|
|
systems requiring fast interactive responses to events.
|
||
|
|
|
||
|
|
endchoice
|
||
|
|
|
||
|
|
config HZ
|
||
|
|
int
|
||
|
|
default 100 if HZ_100
|
||
|
|
default 250 if HZ_250
|
||
|
|
default 1000 if HZ_1000
|
||
|
|
|