[En-Nut-Discussion] The Ethernut board 1.3 drops UDP packets

[Louis B]

Hi,

I have been running some tests with the Ethernut 1.3 and it appears that the 
Ethernut 1.3 is dropping some UDP packets. For the test I have compiled and 
run the “udpClient.c” program available from 
http://pont.net/socket/index.html on Red Hat Linux 9.0. When running 
udpClient each parameter on the command line is sent as a separate UDP 
packet.

I am using the NutUdpReceiveFrom() to receive and then print out all the UDP 
packets.

However only the LAST UDP packets is being received.

Is this normal or am I doing something wrong?

I have checked that the all packets are being sent using “Ethereal”

I have also tried commenting out the printing of the packet and just 
counting the packets instead and the first UDP packets are still being 
dropped.

The Linux machine is connected to the Ethernut using a D-LINK 10BASE-T 
Ethernet
Mini Hub. So everything should be running at 10 Mbps.

Adding usleep(0) to line 82 of  “udpClient.c” makes all the packets appear.

Your FAQ states “About 6 kByte of incoming Ethernet frames can be stored in 
the Ethernet controller without CPU intervention.”.

I would have hoped that extra frames would be queued up inside the Ethernet 
controller instead of being dropped.

Louis B.

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