[Xenomai-help] my first test run on beagleboard

[Xenomai-help] my first test run on beagleboard

[Everett Wang]

Hi all,

I finally managed to compile and install xenomai on my beagleboard C4.
I just did a
kernel latency test and this is the result. Does it look reasonable?
the board is not running
anything except the kernel latency in the testsuit directory (C4
running at 720Mhgz)


* Type ^C to stop this application.
*
*
== Sampling period: 1000 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT|  00:00:01  (periodic user-mode task, 1000 us period, priority 99)
RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
RTD|      4.615|     12.538|     44.307|       0|     0|      4.615|     44.307
RTD|      3.923|     12.923|     45.923|       0|     0|      3.923|     45.923
RTD|      5.153|     12.923|     44.923|       0|     0|      3.923|     45.923
RTD|     11.076|     12.999|     45.923|       0|     0|      3.923|     45.923
RTD|      1.307|     12.538|     44.384|       0|     0|      1.307|     45.923
RTD|      3.461|     12.846|     46.461|       0|     0|      1.307|     46.461
RTD|      4.999|     12.538|     47.615|       0|     0|      1.307|     47.615
RTD|     10.615|     12.923|     48.076|       0|     0|      1.307|     48.076
RTD|     11.153|     12.923|     45.538|       0|     0|      1.307|     48.076
RTD|      3.461|     12.846|     47.076|       0|     0|      1.307|     48.076
RTD|     11.153|     12.538|     44.692|       0|     0|      1.307|     48.076
RTD|      8.692|     12.846|     47.461|       0|     0|      1.307|     48.076
RTD|      5.307|     12.538|     48.769|       0|     0|      1.307|     48.769
RTD|      1.692|     12.846|     45.307|       0|     0|      1.307|     48.769


Best regards,

Everett

Re: [Xenomai-help] my first test run on beagleboard

[Gilles Chanteperdrix]

Everett Wang wrote:
> Hi all,
> 
> I finally managed to compile and install xenomai on my beagleboard C4.
> I just did a
> kernel latency test and this is the result. Does it look reasonable?
> the board is not running
> anything except the kernel latency in the testsuit directory (C4
> running at 720Mhgz)

Hi,

You are probably running latency on an idle board. With more load, you
should get latencies around 70us.

Note that for correct behaviour of floating point operations, you should
use Xenomai 2.5.3 with the patches it contains for Linux 2.6.31 or 2.6.33.

Regards.

-- 
					    Gilles.

Re: [Xenomai-help] my first test run on beagleboard

[Everett Wang]

Hi Gilles,

I am using 2.5.3 and the patches is for kernel 2.6.33. I applied the patches to
the vanilla kernel 3.6.33.3. Does it matter which 2.6.33 kernel to use
(2.6.33.1 2.6.33.2 or 2.6.33.3) ? The cross compiler is CodeSourcery
2010Q1.

I am glad that the VFP is supported in xenomai 2.5.3 :-). Thanks for the
xenomai developers.

My next step is to develop my real time application. Should I use the
same cross
compiler if I want real time and VFP support?

 Best regards,

Everett

On Wed, May 12, 2010 at 8:31 PM, Gilles Chanteperdrix
<gilles.chanteperdrix@xenomai.org> wrote:
> Everett Wang wrote:
>> Hi all,
>>
>> I finally managed to compile and install xenomai on my beagleboard C4.
>> I just did a
>> kernel latency test and this is the result. Does it look reasonable?
>> the board is not running
>> anything except the kernel latency in the testsuit directory (C4
>> running at 720Mhgz)
>
> Hi,
>
> You are probably running latency on an idle board. With more load, you
> should get latencies around 70us.
>
> Note that for correct behaviour of floating point operations, you should
> use Xenomai 2.5.3 with the patches it contains for Linux 2.6.31 or 2.6.33.
>
> Regards.
>
> --
>                                            Gilles.
>