Dnia Wtorek, 27 Maja 2014 19:00 Gilles Chanteperdrix <gilles.chanteperd...@xenomai.org> napisał(a) > On 05/27/2014 12:47 PM, Mariusz Janiak wrote: > > 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.
Hi Gilles, > Are you sure that the problem is not simply that the phy is in its > auto-negotiation phase? Do you poll the mdio registers? > I have suspected a problem with PHY but I wasn't able to get deeper into driver code, especially PHY configuration and control part. I do not feel confident in this area. In a first step we have tried to understand why a standard linux driver operate without such problem, and what has changed since last rt driver update. We thought that problem may be outdated rt dirver. Thanks you suggestion we have new clue, now. Assuming that you are right, what should driver do in this case? Drop tx frames or wait until auto-negotiation will finish? Mariusz ------------------------------------------------------------------------------ The best possible search technologies are now affordable for all companies. Download your FREE open source Enterprise Search Engine today! Our experts will assist you in its installation for $59/mo, no commitment. Test it for FREE on our Cloud platform anytime! http://pubads.g.doubleclick.net/gampad/clk?id=145328191&iu=/4140/ostg.clktrk _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
