Re: [Xenomai-help] rt_task_wait_period returns an undocumented value

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 10/21/2011 09:01 PM, Fernando Herrero Carrón wrote:
> El 21 de octubre de 2011 16:47, Gilles Chanteperdrix <
> gilles.chanteperdrix@xenomai.org> escribió:
> 
>> On 10/21/2011 08:08 PM, Fernando Herrero Carrón wrote:
>>> Alright, excuse me, I missed that explanation.
>>>
>>> Then let me move to the actual figures at hand:
>>>
>>>  $ cat /proc/xenomai/latency
>>> 3349
>>>
>>> and, as I explained above, all values below 11450 are being rejected in
>> my
>>> case.
>>
>> I guess you have to check the code to understand what happens. But
>> really, running tasks with a 11500 period is already preposterous.
> 
> 
> It's the very minimal example that I could come up with, I can attach the
> code if you will. But there is not much more than mlockall(),
> rt_task_shadow(), rt_task_set_periodic() and
> while(){rt_tast_wait_period()}...

I mean check xenomai code.

> 
> Why do you mean it is preposterous? Because it is not a round figure or
> because it is too low? If you mean it is too low, well, I have a DAQ board
> that can make acquisitions at up to 120kHz, which means a period of 8000 ns.
> I want to achieve the fastest acquistion rate possible, and was pushing the
> limits to see where xenomai could go.

Because it is way too low, you will get a complete lockup of your system
as soon as you starting putting load on it.

-- 
                                                                Gilles.