Hi
The linux tasks are not blocked (not all).
I think the problem is , that the linux scheduler function in the kernel
is not called for some ms.
I have also traced the calls to the scheduler function
"static int __sched __schedule(void)"
and sometimes when the decribed problem occur this function is not
called while no linux task are running.
Harald Fessl
As you already recorded (f)traces, just dive deeper and check why some
of the Linux tasks are blocked, ie. when they go to sleep, check the
reason. And then, when they wake up again, check who woke them up and
via which mechanism. Maybe that will provide some trace to what goes wrong.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
On 2015-09-22 16:13, Wolfgang Netbal wrote:
>>
>>
>> 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 ?
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