[Xenomai] Slow execution of RT task

Jeroen Van den Keybus jeroen.vandenkeybus at gmail.com
Mon Apr 14 22:18:19 CEST 2014


> Do you have CONFIG_NO_HZ_FULL enabled? If so, could you disable it and
> retry? Next step, same question for CONFIG_NO_HZ_IDLE.

Same results, but now latency figures are somewhat higher:

RTT|  00:00:01  (periodic user-mode task, 100 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
RTD|      0.035|      0.288|      7.512|       0|     0|      0.035|      7.512
RTD|     -0.661|      0.294|      7.626|       0|     0|     -0.661|      7.626
RTD|     -0.680|      0.293|      7.907|       0|     0|     -0.680|      7.907

rt_timer_read still requires 1.6 us (or at least that's what I get
back from rt_timer_read).


J.




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