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Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 10 years 3 months ago. By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it | |
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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 |
10 | to have the timer interrupt run at 1000 Hz but 100 Hz may be more |
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 |
22 | 100 Hz is a typical choice for servers, SMP and NUMA systems |
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 |
29 | 250 Hz is a good compromise choice allowing server performance |
30 | while also showing good interactive responsiveness even |
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. |
41 | |
42 | config HZ_1000 |
43 | bool "1000 HZ" |
44 | help |
45 | 1000 Hz is the preferred choice for desktop systems and other |
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 |
54 | default 300 if HZ_300 |
55 | default 1000 if HZ_1000 |
56 | |
57 | config SCHED_HRTICK |
58 | def_bool HIGH_RES_TIMERS |
59 |
Branches:
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ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz-3.6-rc2-pwm
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jz-3.9-rc8
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jz47xx-2.6.38
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9