[Xenomai] ipipe-gch-ipipe-3.0-imx6q latency

Gilles Chanteperdrix gilles.chanteperdrix at xenomai.org
Mon Dec 14 23:19:10 CET 2015


On Mon, Dec 14, 2015 at 05:05:48PM +0800, eric wrote:
>    Above i use the wrong version about latency test , now it works and the latency test 
>  
> RTD|     22.513|     39.832|     60.649|       0|     0|     11.269|     63.939
> RTD|     27.225|     40.068|     61.134|       0|     0|     11.269|     63.939
> RTD|     27.270|     40.531|     60.103|       0|     0|     11.269|     63.939
> RTD|     14.876|     39.540|     61.451|       0|     0|     11.269|     63.939
> RTD|     15.890|     39.760|     68.512|       0|     0|     11.269|     68.512
> RTD|     10.951|     29.915|     61.269|       0|     0|     10.951|     68.512
> RTD|     10.981|     12.596|     15.118|       0|     0|     10.951|     68.512
> RTD|     10.814|     12.648|     16.284|       0|     0|     10.814|     68.512
> RTD|     10.920|     12.636|     15.057|       0|     0|     10.814|     68.512
> RTT|  00:09:38  (periodic user-mode task, 1000 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
> RTD|     10.784|     12.672|     15.465|       0|     0|     10.784|     68.512
> RTD|     11.071|     12.602|     15.374|       0|     0|     10.784|     68.512
> RTD|     10.904|     12.632|     14.859|       0|     0|     10.784|     68.512
> RTD|     10.934|     12.639|     15.056|       0|     0|     10.784|     68.512
> RTD|     11.010|     12.575|     15.146|       0|     0|     10.784|     68.512
> 

So the latency is below 100us, much less than 500us. It seems a bit
high though, do you have any debug option enabled? Do you run this
with a real-time load?

-- 
					    Gilles.
https://click-hack.org



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