On 02/06/2014 05:25 PM, Marcel van Mierlo wrote:
Hi,
I've been investigating this for a couple of days and would really
appreciate some insight
on what might be going on or what I can do to progress this...
I am porting a legacy pSOS application - to Xenomai on BeagleBoard Black
3.8 kernel
and have noticed %CPU (via. top) of MAIN around 40% when using q_send,
and doing no "work".
Surprisingly, if I add a printf() and fflush() to the task body then
the CPU drops down to < 1%.
I've checked compile options, nothing obviously wrong. Here is the
(abridged) body of the task.
It just provides a periodic message for watchdog purposes.
[%CPU ~%40]
while{1}
{
q_send(ulCanTQid, (INT32 *)&oCanMsg);
tm_wkafter(100); // ~100ms
Have you checked that the comment is right? Are you sure you are not
sleeping 100ns ?
--
Gilles.
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