[linux-2.6-block.git] / kernel / Kconfig.hz

#
# 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
Commit	Line	Data
59121003 CL	1	#
	2	# Timer Interrupt Frequency Configuration
	3	#
	4
	5	choice
	6	prompt "Timer frequency"
	7	default HZ_250
	8	help
	9	Allows the configuration of the timer frequency. It is customary
40fcfc87	10	to have the timer interrupt run at 1000 Hz but 100 Hz may be more
59121003 CL	11	beneficial for servers and NUMA systems that do not need to have
	12	a fast response for user interaction and that may experience bus
	13	contention and cacheline bounces as a result of timer interrupts.
	14	Note that the timer interrupt occurs on each processor in an SMP
	15	environment leading to NR_CPUS * HZ number of timer interrupts
	16	per second.
	17
	18
	19	config HZ_100
	20	bool "100 HZ"
	21	help
40fcfc87	22	100 Hz is a typical choice for servers, SMP and NUMA systems
59121003 CL	23	with lots of processors that may show reduced performance if
	24	too many timer interrupts are occurring.
	25
	26	config HZ_250
	27	bool "250 HZ"
	28	help
40fcfc87	29	250 Hz is a good compromise choice allowing server performance
59121003	30	while also showing good interactive responsiveness even
40fcfc87 AC	31	on SMP and NUMA systems. If you are going to be using NTSC video
	32	or multimedia, selected 300Hz instead.
	33
	34	config HZ_300
	35	bool "300 HZ"
	36	help
	37	300 Hz is a good compromise choice allowing server performance
	38	while also showing good interactive responsiveness even
	39	on SMP and NUMA systems and exactly dividing by both PAL and
	40	NTSC frame rates for video and multimedia work.
59121003 CL	41
	42	config HZ_1000
	43	bool "1000 HZ"
	44	help
40fcfc87	45	1000 Hz is the preferred choice for desktop systems and other
59121003 CL	46	systems requiring fast interactive responses to events.
	47
	48	endchoice
	49
	50	config HZ
	51	int
	52	default 100 if HZ_100
	53	default 250 if HZ_250
40fcfc87	54	default 300 if HZ_300
59121003 CL	55	default 1000 if HZ_1000
59121003 CL	56
8f4d37ec	57	config SCHED_HRTICK
0a06ff06	58	def_bool HIGH_RES_TIMERS