mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Christoph Lameter](/assets/img/avatar_default.png)
Make the timer frequency selectable. The timer interrupt may cause bus and memory contention in large NUMA systems since the interrupt occurs on each processor HZ times per second. Signed-off-by: Christoph Lameter <christoph@lameter.com> Signed-off-by: Shai Fultheim <shai@scalex86.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
46 lines
1.2 KiB
Text
46 lines
1.2 KiB
Text
#
|
|
# 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
|
|
|