Re: [Xenomai-help] help with xenomai configuration

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

Philippe Gerum wrote:
> On Tue, 2009-05-05 at 15:23 +0200, Gilles Chanteperdrix wrote:
>> henning.richter@domain.hid wrote:
>>> Hi,
>>>
>>> I use a KUbuntu 8.10 with kernel 2.6.27.7, xenomai 2.4.6.1 and the latest
>>> rtnet version.
>>> I set up the EthercatMasterLibrary and send some Frames (size of ~1200
>>> byte) cylical to my Beckhoff devices.
>>> Measuring the time (via rt_read_timer-function of timer.h) handing the
>>> frames over to the NIC last between 5 and 10 us. (its the low_level_send)
>>> Measuring the time at the application layer is takes ~250 - 350 us. So I am
>>> loosing quite a lot time in between.
>>>
>>> Maybe there is sth. wrong with my xenomai configuration.
>>> I run the 'xeno-test' (results below) but the test stop at generation load.
>> Yes, xeno-test has a known issue when run without bash, and ubuntu no
>> longer uses bash by default. So, try running xeno-test with bash.
>>
> 
> Gilles, we have an ongoing series of recurring issues with xeno-test
> that pleads for a reshuffle. I would really like to see something
> simpler in there, which may not cover all aspects that xeno-test
> currently addresses, but which would at least work for all setups, and
> particularly embedded ones.

Yes, I am ok. These issues with xeno-test are annoying.

> We should rather see xeno-test as a simple validation tool to dig out
> most common latency issues due to bad kernel settings. Further
> validation via long running stress tests would be better accomplished
> via the LTP-based suite we use internally to validate ports, within
> standalone mini-rootfs; maybe at some point we could provide those
> pre-built rootfs for download, for that particular purpose.

Yes, Ok too.

> 
>> Alternatively, you can run the latency test directly. Preferably using
>> the same period as the problematic one with EML.
>>


-- 
                                                 Gilles.