From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 28 Jan 2011 09:34:29 +0100 (CET) From: Michel Rinaldi Message-ID: <22672536.41296203668390.JavaMail.SYSTEM@PC-MRINALDI> In-Reply-To: <29582899.21296203622078.JavaMail.SYSTEM@PC-MRINALDI> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3_26402479.1296203668390" Subject: Re: [Xenomai-help] Problems with rt_task_create and rt_task_join List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: xenomai@xenomai.org ------=_Part_3_26402479.1296203668390 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit >Posted by Gilles Chanteperdrix on January 27, 2011 - 14:36: >Strange, here, the LTP test takes only around 2 hours. Just to be sure: >you also generated disk and network activity in parallel to LTP and >latency? If yes, then this system has no issue with Xenomai, and the >problem you have with your application is in the application itself. I launch runltp command with -t flag (which specifies test duration) to run LTP tests for one day. I cannot run nettests and disk I/O tests from ltp battery because they require additional features (former requires another linux PC with ltp installed, latter requires floppy and CD player which aren't present on my pc). So, I create a script that downloads via network a larger (100Mb) file, and create, copy and delete some files on hard disk, all in a while loop, to generate network and disk I/O traffic. I re-run ltp and latency test running for 15 hours in parallel with this script also. I obtain: RTD| 1.081| 8.000| 47.249| 0| 0| 14:58:34/14:58:34 Now I can assert that my xenomai works grat, I think. And then, problems are in my application. The only thing that looks me strange is this: with ltp+my_I/O_stress_script+latency tests, I obtain a minimum latency value (1.081) that is more less than ltp+latency only tests (6.182). So, lower latency was obtained with higher system load. Maybe there's some CPU frequency reductions in act during ltp+latency that isn't active during ltp+latency+my_I/O_stress_script, also if in my kernel configuration CPU frequency stepping was disabled? Or what could be happened? Thank you very much for your helpfullness, Gilles. ------=_Part_3_26402479.1296203668390 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <= div style=3D'font-family: Times New Roman; font-size: 12pt; color: #000000'= >>Posted by Gilles Chanteperdrix on January 27, 2011 - 14:36:

>= ;Strange, here, the LTP test takes only around 2 hours. Just to be sure:>you also generated disk and network activity in parallel to LTP and>latency? If yes, then this system has no issue with Xenomai, and the>problem you have with your application is in the application itself.<= br>
I launch runltp command with -t flag (which specifies test duration)= to run LTP tests for one day.
I cannot run nettests and disk I/O tests = from ltp battery because they require additional features (former requires = another linux PC with ltp installed, latter requires floppy and CD player w= hich aren't present
on my pc).
So, I create a script that downloads v= ia network a larger (100Mb) file, and create, copy and delete some files on= hard disk, all in a while loop, to generate network and disk I/O traffic.<= br>I re-run ltp and latency test running for 15 hours in parallel with this= script also.
I obtain:

RTD| 1.081| 8.000| 47.249| 0| 0| 14:58:34= /14:58:34

Now I can assert that my xenomai works grat, I think.
A= nd then, problems are in my application.

The only thing that looks m= e strange is this: with ltp+my_I/O_stress_script+latency tests, I obtain a = minimum latency value (1.081) that is more less than ltp+latency only tests= (6.182).
So, lower latency was obtained with higher system load.
May= be there's some CPU frequency reductions in act during ltp+latency that isn= 't active during ltp+latency+my_I/O_stress_script, also if in my kernel con= figuration CPU frequency stepping was disabled?
Or what could be happene= d?

Thank you very much for your helpfullness, Gilles.

<= /body> ------=_Part_3_26402479.1296203668390--