diff options
Diffstat (limited to 'kernel/Kconfig.hz')
| -rw-r--r-- | kernel/Kconfig.hz | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz new file mode 100644 index 0000000..94fabd5 --- /dev/null +++ b/kernel/Kconfig.hz @@ -0,0 +1,58 @@ +# +# 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) |
