[ECOS] dropped UDP packets on 8270 PowerPC board

[Paul Randall]

Hi all,

I have been having a problem with UDP packets being dropped on a 
Freescale MPC8270 board we developed based on the A&M Rattler 8280 PCI 
board.

I have added sequence numbers to each UDP packet being transmitted to 
the board.  The application running on the board prints an error message 
when it detects a missing sequence number.  If the board is only 
receiving packets and not transmitting them, I don't get any missing 
packets, even up to a bitrate of 5 Mbit/sec.  However when the board has 
to transmit data, I start to see missing sequence numbers in the 
received data.

I'm not sure where the packets are being dropped.  I tried adding debug 
messages to the ethernet driver, but I'm not seeing anything so I assume 
the packets are being dropped in the TCP/IP stack.

Has anyone seen this problem or know how I can find out where the 
packets are being dropped?

Best regards,

Paul Randall
Delta Digital Video

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