Make HZ fully configurable through menuconfig. Already posted at http://lkml.org/lkml/2006/6/18/111
Signed-off-by: Jan Engelhardt Cc: Alan Cox <[EMAIL PROTECTED]> (http://lkml.org/lkml/2006/11/8/307) Cc: Sam Ravnborg <[EMAIL PROTECTED]> Kconfig.hz | 70 +++++++++++++++++++++++-------------------------------------- 1 file changed, 27 insertions(+), 43 deletions(-) Index: linux-2.6.21-rc5/kernel/Kconfig.hz =================================================================== --- linux-2.6.21-rc5.orig/kernel/Kconfig.hz +++ linux-2.6.21-rc5/kernel/Kconfig.hz @@ -2,50 +2,34 @@ # 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. +config HZ + int "Timer frequency" + default 100 + ---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. + + 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. + + 250 Hz is a good compromise choice allowing server performance + while also showing good interactive responsiveness even on SMP + and NUMA systems. + + 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. -endchoice + 1000 Hz is the preferred choice for desktop systems and other + systems requiring fast interactive responses to events. config HZ int #<EOF> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
