[Xenomai-core] rt_task_wait_period returning -ETIMEDOUT

[Xenomai-core] rt_task_wait_period returning -ETIMEDOUT

[Ignacio García Pérez]

Hi,

rt_task_wait_period() is spuriously returning -ETIMEDOUT.

(spuriously = maybe once every two hours with period = 500us)

I'm using the trunk code and that error code is not mentioned in the 
rt_task_wait_period documentation.

Any clues?

Nacho.

Re: [Xenomai-core] rt_task_wait_period returning -ETIMEDOUT

[Jan Kiszka]

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Ignacio García Pérez wrote:
> Hi,
> 
> rt_task_wait_period() is spuriously returning -ETIMEDOUT.
> 
> (spuriously = maybe once every two hours with period = 500us)
> 
> I'm using the trunk code and that error code is not mentioned in the
> rt_task_wait_period documentation.
> 
> Any clues?

testsuite/latency makes use of rt_task_wait_period as well. Already
tried to run it at the same frequency? Does it fail as well?

Further question: Does this error correlate with some real deadline miss
of your application?

SMI&friends might be a reason here, check delays of the testsuite (and
your kernel config, of course). Is the workaround enabled? Is it
reported to be used (kernel log)?

Jan


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