mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 23:02:08 +00:00
94f5655988
Currently, it seems SCHED_HRTICK allowed for !SMP. But, it seems to have no dependency of it. Fix it. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
59 lines
1.7 KiB
Plaintext
59 lines
1.7 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. 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
|
|
systems requiring fast interactive responses to events.
|
|
|
|
endchoice
|
|
|
|
config HZ
|
|
int
|
|
default 100 if HZ_100
|
|
default 250 if HZ_250
|
|
default 300 if HZ_300
|
|
default 1000 if HZ_1000
|
|
|
|
config SCHED_HRTICK
|
|
def_bool HIGH_RES_TIMERS && (!SMP || USE_GENERIC_SMP_HELPERS)
|