Messages in this thread | | | Subject | Re: recomended way to check longest period that interupts are disabled ? | From | Thomas Gleixner <> | Date | Thu, 26 Apr 2007 19:15:23 +0200 |
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On Thu, 2007-04-26 at 05:19 -0700, Mike Mattie wrote: > Thanks for the comments. After running cyclictest it definitely looks > like the average jitter is really low, around 7-8 . The max is really > high , >100 > > If I am interpreting this correctly for the most part the jitter is > pretty low, but something horrible is happening that blows up the > max value.
Yup
> ./cyclictest -p 30 -t 6 > 2.00 1.84 1.41 3/120 13760 > > T: 0 (13130) P:30 I:1000 C: 42763 Min: 4 Act: 10 Avg: 8 Max: 133 > T: 1 (13131) P:29 I:1500 C: 28509 Min: 4 Act: 6 Avg: 7 Max: 114 > T: 2 (13132) P:28 I:2000 C: 21382 Min: 4 Act: 7 Avg: 6 Max: 157 > T: 3 (13133) P:27 I:2500 C: 17106 Min: 4 Act: 11 Avg: 7 Max: 110 > T: 4 (13134) P:26 I:3000 C: 14255 Min: 4 Act: 8 Avg: 7 Max: 1011 > T: 5 (13135) P:25 I:3500 C: 12218 Min: 4 Act: 12 Avg: 8 Max: 118
What happens with
# cyclictest -p 80 -n
At first it puts the timer thread above everything else and second it uses nanosleep instead of the signal delivered posix timers.
tglx
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