[Xenomai] An explanation on cyclictest results and other...

[Xenomai] An explanation on cyclictest results and other...

[Pampolini Matteo]

Hello there,

my name is Matteo, I'm writing from Italy and I am a newbie in Xenomai, but I'm really enjoying
playing with it, it seems to be a great piece of software, my congratulations to all the developers!

Currently I'm working on a Freescale QorIQ P2020 evaluation board, with Linux kernel 3.8.13 and
Xenomai 2.6.4. I have to questions for you:

1) If I do not disable SMP support kernel crashes at boot, any ideas for this?

2) Before realizing that Xenomai provides its own enhanced version of cyclictest (sigh!) I took
the one from rt-tests package and recompiled it by using Xenomai POSIX skin. In my understanding
they should give similar results, but while I get an average latency of 1 with the Xenomai provided
one, I get 16 with the latter one! What am I doing wrong?

Many thanks in advance for your kind help,

Matteo
This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person.
Questa e-mail e tutti i suoi allegati sono da intendersi inviati in via riservata all'effettivo destinatario e possono essere soggetti a restrizioni legali. Se non siete l'effettivo destinatario o avete ricevuto il messaggio per errore siete pregati di cancellarlo dal vostro sistema e di avvisare il mittente. E' vietata la duplicazione, l'uso a qualsiasi titolo, la divulgazione o la distribuzione dei contenuti di questa e-mail a qualunque altro soggetto.

Prima di stampare questa comunicazione consideratene, per favore, l'impatto ambientale
Please consider the environment before printing this email

Re: [Xenomai] An explanation on cyclictest results and other...

[Gilles Chanteperdrix]

On Wed, Nov 05, 2014 at 02:57:21PM +0100, Pampolini Matteo wrote:
> 2) Before realizing that Xenomai provides its own enhanced version of cyclictest (sigh!) I took
> the one from rt-tests package and recompiled it by using Xenomai POSIX skin. In my understanding
> they should give similar results, but while I get an average latency of 1 with the Xenomai provided
> one, I get 16 with the latter one! What am I doing wrong?

You are making the assumption, that recompiling an application to
use xenomai posix skin will magically get it working in primary mode
on Xenomai co-kernel. This assumption is generally wrong, see:

http://xenomai.org/2014/08/porting-a-linux-application-to-xenomai-dual-kernel/

-- 
					    Gilles.

Re: [Xenomai] An explanation on cyclictest results and other...

[Pampolini Matteo]

Hi Gilles,

many thanks for your reply and sorry for the delay of mine.

I had a look at the page you pointed me at and now things are more clear
to me,
though I still have to study...

And what about SMP support (my first question), is it supported for
PowerPC 32
in the version I'm using?

Regards, Matteo

On 05/11/2014 19:42, Gilles Chanteperdrix wrote:
> On Wed, Nov 05, 2014 at 02:57:21PM +0100, Pampolini Matteo wrote:
>> 2) Before realizing that Xenomai provides its own enhanced version of cyclictest (sigh!) I took
>> the one from rt-tests package and recompiled it by using Xenomai POSIX skin. In my understanding
>> they should give similar results, but while I get an average latency of 1 with the Xenomai provided
>> one, I get 16 with the latter one! What am I doing wrong?
> You are making the assumption, that recompiling an application to
> use xenomai posix skin will magically get it working in primary mode
> on Xenomai co-kernel. This assumption is generally wrong, see:
>
> http://xenomai.org/2014/08/porting-a-linux-application-to-xenomai-dual-kernel/
>

This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person.
Questa e-mail e tutti i suoi allegati sono da intendersi inviati in via riservata all'effettivo destinatario e possono essere soggetti a restrizioni legali. Se non siete l'effettivo destinatario o avete ricevuto il messaggio per errore siete pregati di cancellarlo dal vostro sistema e di avvisare il mittente. E' vietata la duplicazione, l'uso a qualsiasi titolo, la divulgazione o la distribuzione dei contenuti di questa e-mail a qualunque altro soggetto.

Prima di stampare questa comunicazione consideratene, per favore, l'impatto ambientale
Please consider the environment before printing this email