xenomai3.0.5 latency have big overrun

xenomai3.0.5 latency have big overrun

[sunner.xu]

 Dear  all，

        I have do something in xenomai3 latency program（linux4.9.24+xenomai3.0.5 and close all function that affect real-time）.

       and found that it run about 41mins , a big overrun is happen as follows:

  
   
    1) why the big overrun happen event cpu occupy is low(40%)?
    2) how can solve the problem, and trace the big overrun?

    Thanks!


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Re: xenomai3.0.5 latency have big overrun

[chensong]

In general, i used ftrace to figure out latency sources, below is what i 
did, you can give it a try

trace-cmd start -e irq -e sched -e timer -p function -l '*spin*'; 
cyclictest -p 90 -m -c 0 -n -i 100 -h 100 -q -l 1000000 -a -b 80 --tracemark
trace-cmd extract
trace-cmd report -l > your_tracecmd_report.txt



On 2020年06月29日 09:08, sunner.xu--- via Xenomai wrote:
>
>   Dear  all，
>
>          I have do something in xenomai3 latency program（linux4.9.24+xenomai3.0.5 and close all function that affect real-time）.
>
>         and found that it run about 41mins , a big overrun is happen as follows:
>
>
>
>      1) why the big overrun happen event cpu occupy is low(40%)?
>      2) how can solve the problem, and trace the big overrun?
>
>      Thanks!
>
>
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>