[Xenomai] Fwd: Periodic high latency

Philippe Gerum rpm at xenomai.org
Thu Jun 19 16:06:53 CEST 2014


Hi,

On 06/19/2014 02:48 PM, thierry mallard wrote:
>
> Hi,
>
> I have installed xenomai 2.6.3 with a kernel 2.6.38.8 on my dell laptop
> using adeos-ipipe-2.6.38.8-x86-2.11-03.patch.

If using a more recent kernel is an option, then you may want to 
consider switching to 3.8+.

> CPU is i5-3230M.
>
>
> When running xeno latency, I get the following results.
> What can be the cause of the high latencies that I get periodically?
>
> 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|     17.600|     42.573|     60.172|       0|     0| 17.600|     60.172
> RTD|     17.699|     45.817|    379.512|       3|     0| 17.600|    379.512

This could be a SMI issue:

http://www.xenomai.org/documentation/xenomai-2.6/html/TROUBLESHOOTING/#_the_latency_test_shows_high_latencies

As a first step, you should check the boot log for SMI-related messages 
from Xenomai, such as:

http://www.xenomai.org/documentation/xenomai-2.6/html/TROUBLESHOOTING/#SMI

-- 
Philippe.




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