Gilles FRITZ wrote:
> Hi,
>
> I use Xenomai since not very long, but I have seen a strange behavior : when
> I stop a user-space task, my in-kernel task have a latency of about 500µs.
>
> I have observed that on Xenomai 2.4.8 and 2.3.4, on kernel 2.6.25.19 and
> 2.6.28.9.
>
> To observe that, I launch two latency test : one in user-space and the
> second in kernel-space
> latency -p 50 -t 1
> latency -p 70
>
> When I stop the second latency (in user-space), I can observe a latency of
> at least 500ms in the in-kernel task.
>
> I do not know if this is normal or not.
>
> Have you an explanation for that?
I do not think we have but:
- 50us and 70us are a bit short periods depending on the platform
(though it should not change anything to use larger periods), and you
did not tell us on what platform you are running xenomai
- the I-pipe patch proposes an option, the I-pipe tracer, which will
tell you exactly what happens during these 500us.
--
Gilles.
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