[casper] UDP problem

[rick raffanti]

Hello Caspersphere,
I have a design which uses the TenGbE core (version 1) and sends out 8kB 
packets.  It works fine and we achieve 6Gb/s throughput which is 
plenty.  Recently i made a change to send a short packet with some timer 
data following all of the big packets.  This short packet contains just 
16 bytes.  For some reason, it doesn't show up at the host.  I have test 
points on the tx_valid and tx_eof control lines, and I can see that they 
are being asserted properly.  But the packet just doesn't show up.  I 
don't believe there is any minimum data size for a UDP packet, but I 
wonder if anybody has any ideas about this.  Could it be getting 
swallowed up by the NIC in the (windows) host?
Thanks for any help
Rick