Re: [Xenomai-help] Timing calculation

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

Prakash A S wrote:
>     prakash srinivasan wrote:
>     >>>>> printf(TOTAL LOOP TIMING=%ld us\n",
>     >>>>> (long)((rt_timer_ticks2ns(end-start))/1000);
>     >>>> What does: printf(TOTAL LOOP TIMING=%lld us\n",
>     >>>> rt_timer_ticks2ns(end-start)/1000); report.
>     >>> TOTAL LOOP TIMING = 5377070 us In this case, the (unsigned)
>     >>> (long) (long)tart returns 1069623206 and (unsigned) (long)
>     >>> (long)end returns 2151726697
>     >> Are you happy with that result? Did really pass approx. 5 seconds
>     > between start and end?
> 
>     Could you format your mails correctly to make them readable? Use text,
>     not HTML, truncate at 72 characters, and use > as a quotation mark,
>     meaning that one '>' is the sign that you quote someone, two '>' is you
>     quoting someone who quoted someone else, etc... I am really sorry to
>     have to tell you about this, this is really basic knowledge of the
>     netiquette, we should not have to tell you about it.
> 
>     > Definitely not and I am not confident about this output. Coz in this
>     > loop period I am sending datas from client to the server. Visibly
>     > noted that the server is getting all the datas within a second. So I
>     > am not sure the 5 sec is the right output. I just like to know all
>     > the above conversions are correct? and is it ok that the start ticks
>     > can be more than the end ticks?
> 
>     The result of rt_timer_read is a long long, so, if you cast it to an
>     unsigned, you loose the most significant bits. So, the result is totally
>     meaningless. This again, is basic knowledge of the C language, we should
>     not have to explain.
> 
>     Your bug report is quite insufficient, we do not even know what version
>     of Xenomai you use, maybe you are reporting a bug which has been solved
>     a long time ago. Neither do we know what version of Linux and of the
>     Adoes patch you use, or the contents of your .config file. We do not
>     have a self-contained example that we can run to try and reproduce your
>     issue.
> 
>     So if you want some answers, please give us the means to answer you.
> 
> 
> As an community person I AGREED with what you pointed out. My main mistake was I subscribed the
> 
> mailing list with an useless mailID. Now I changed my mail ID. Surely you will get the proper 
> quote in future. In between the mail change, I lost the continuation for this topic and did not
> get this reply mail to my new mail ID. Simply copy and pasted the last mail from the archive.  

We still receive HTML.

> 
> Obviously I should improve my C language skills.
> 
> I am using linux kernel 2.6.30.8 on Ubuntu 8.04,
> Adeos-ipipe-2.6.30.8-x86-2.4-09.patch and Xenomai-2.5.3

What about the kernel configuration and self-contained test exhibiting
the behaviour you do not understand?

-- 
					    Gilles.