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.
Are you sure that the problem is not simply that the phy is in its
auto-negotiation phase? Do you poll the mdio registers?
--
Gilles.
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