Hi,
> There are so many reasons that could happen.
> At first, are you sure , your xenomai system has not any jitter involved
> ? And how have you checked it ?
It seems that, Xenomai is running stable, we have tested it with standard xeno
utilities. We have observed similar problem with rt_e1000e driver on several
different machines. The problem is following, tdma module periodically allocate
memory for synchronization frame and then issue tx service from driver. When
driver is not sending a frames, it does not release memory in tx interrupt.
After a while, RTnet stack is out of memory and tdma report "TDMA: Failed to
transmit sync frame!" (function
tdma_xmit_sync_frame(...) in tdma_proto.c). Unfortunately I am not understand
how it can be related with jitter. I wonder why driver in not sending a frame
after calling rtmac_xmit(rtskb); by tdma module.
Mariusz
> > Regards,
> > S.Ancelot
> >
> >
> > On 26/05/2014 11:16, Mariusz Janiak wrote:
> > > Dear all,
> > >
> > > We are looking for a person who is able to update the rt_e1000e driver to
> > > make it supporting the newer Intel NIC like 82574L, 82579LM, 82567V
> > > correctly under the Xenomai 2.6.3 with a kernel at least 3.8.13 or newer.
> > > The problem is following, while RTnet modules and drivers load correctly
> > > without any warnings, NIC is not able to send ethernet frames for some
> > > random time. During that time, RTnet stack report that is not able to
> > > transmit synchronization frame ("TDMA: Failed to transmit sync
> > > frame!"), the rt_e1000e driver reset device several times, and two leds
> > > integrated with connector are not blinking. After a while, device start
> > > to operate normally, sync frame are sending normally, and there is no
> > > further issues. The main problem is, that we don't know when RTnet stack
> > > start to work, so we have to wait unpredictable period of time. Also just
> > > after NIC start sending sync frames, it has buffered several old ones, so
> > > it send them one ofter another as fast as possible, what
> make
> > > problem for our custom devices during synchronization phase. Currently,
> > > we observe similar non acceptable behavior on following machines:
> > > - Supermicro MBD-X9SPV-M4-3QE-O,
> > > - Advantech PCM-3363D-1GS8A1E,
> > > - Commel Mini-ITX Motherboard LV-67C.
> > > with latest RTnet git version, Xenomai 2.6.3, kernel 3.8.13 and Ubuntu
> > > 12.04.
> > >
> > > We expect that an involved person should prepare a patch which remove
> > > described issues and applies cleanly to the latest RTnet git version. The
> > > patch should be available for a community on the same license as RTnet
> > > stack. Patch will be tested on listed devices.
> > >
> > > We offer a contract to perform a specified task, one of the parties will
> > > be
> > >
> > > Wroclaw University of Technology
> > > Wybrzeże Wyspiańskiego 27
> > > 50-370 Wrocław
> > > tel. 71 320 26 00
> > > NIP: 896-000-58-51
> > > REGON: 000001614
> > > www.pwr.edu.pl
> > >
> > > Please send your letter of application including, short CV, expected
> > > salary (EUR or PLN) and estimated time period required for patch
> > > preparation, to
> > >
> > > Mariusz Janiak
> > > Chair of Cybernetics and Robotics,
> > > Wroclaw University of Technology
> > > Janiszewskiego 11/17,
> > > Wroclaw, Poland,
> > > tel: +48 71 320 26 44
> > > email: mariusz.jan...@pwr.edu.pl
> > >
> > > Best regards,
> > > Mariusz
> > >
> > >
> > >
> > >
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