[ECOS] Loss frames In UDP, full Duplex asynchronous mode

[e dot coullien at faiveley dot com]

Hi,

We lost UDP frames in full Duplex and asynchronous Send/Receive mode but not in
an Receive/Answer mode.

We tried 2 tests :

1) Synchronous mode : a PC send frames to the board every 20ms, and when
receiving a frame, the board send an answer frame. In this synchronous
configuration no problem was found. It works find !

2) Asynchronous mode : a board send frames to the PC every 20ms, and the PC send
a frame every second without synchronisation on the reception.
As the frame contains an incremental counter, we add some tests in the file
IF_FCC ("fcc_eth_int" and "fcc_eth_RxEvent" fonctions ) to detect a missing
frame. Then we saw that we lost some frames. We are sure that the PC send the
frame by analysing the communication with the Ethereal ethernet analyser.

We just tested it on a PowerPC board because we don't have other board.
Does someone ever find this kind of problem on an other board or have you an
idea how to search an explanation ?


Thanks,

E. Coullien



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