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SubjectRe: [ckpatch][15/29] hz-no_default_250.patch
>
>Thanks for your perspective. I found performance hits on computational tasks
>with 250 vs 100 but your finer precision makes perfect sense.
>

Or this one so every user can set any value s/he wants. :)

Done-by: Me.

diff --fast -Ndpru linux-2.6.17-rc6~/kernel/Kconfig.hz linux-2.6.17-rc6+/kernel/Kconfig.hz
--- linux-2.6.17-rc6~/kernel/Kconfig.hz 2006-06-06 02:57:02.000000000 +0200
+++ linux-2.6.17-rc6+/kernel/Kconfig.hz 2006-06-16 17:15:46.884794000 +0200
@@ -2,45 +2,26 @@
# 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.
+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.

-endchoice
+ 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
- int
- default 100 if HZ_100
- default 250 if HZ_250
- default 1000 if HZ_1000
+ 250 HZ is a good compromise choice allowing server performance
+ while also showing good interactive responsiveness even on SMP
+ and NUMA systems.

+ 1000 HZ is the preferred choice for desktop systems and other
+ systems requiring fast interactive responses to events.
#<<eof>>


Jan Engelhardt
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