[Xenomai] Problem that the Linux scheduler is not called for some ms

[Wolfgang Netbal <wolfgang.netbal@sigmatek.at>]

Hi guys

I have a problem that the linux scheduler is not called for some ms.
The cpu load is very low.

Im using a iMX6, linux kernel 3.0.42 and xenomai 2.6.2.1.

I have attached a graphical task trace where you can see the task switches.
The tasks with prefix X- are xenomai task, the prefix L- means linux task.
In the first line you can see the tick from a fpga to start the folowing
tasks, X-realtime, X-cyclic, X-Loader and X-background.
The X-Cyclic task is switching to linux (L-Cyclic) in each cycle because
it is calling UDP functions.
Up the mark 195 ms everthing is working correct.
  From the mark 195 ms up to 199 ms there is no linux task (L-) running.
I have also seen that the linux scheduler function is not called from
the mark 195ms to 199ms.

Does anybody know what is the problem ?
Are there some linux/xenomai settings to modify this behavior ?

Kind regard

-- 
Wolfgang Netbal
Betriebssystem
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Tel.:  +43/6274/4321-0
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E-Mail:wolfgang.netbal@sigmatek.at
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