Author Topic: RCM3200 UDP packets lost  (Read 1963 times)

RTPeterson

  • Member
  • ***
  • Posts: 1
RCM3200 UDP packets lost
« on: June 01, 2015, 02:46:44 pm »
I have 25 of these embedded systems which send and receive 20, 15 byte UDP datagrams per second to a PC through a crossover cable (no switch, no router). Inside a costate {}, the udp_sendto function always returns 15, never anything else.

On an XP machine (for 8 years), on average, 1 in about 5600 packets get dropped, however, on a Windows 7 machine (now required), on average, 1 in 23 packets get dropped.Wireshark does not see the missed datagram, neither does the PC but the RCM3200 thinks they are on their way.

udp_open ( &socket, 6400, -1, 6500, datahandler )

I have 25 of these embedded systems which send and receive 20, 15 byte UDP datagrams per second to a PC through a crossover cable (no switch, no router). Inside a costate {}, the udp_sendto function always returns 15, never anything else.

On an XP machine (for 8 years), on average, 1 in about 5600 packets get dropped, however, on a Windows 7 machine (now required), on average, 1 in 23 packets get dropped.Wireshark does not see the missed datagram, neither does the PC but the RCM3200 thinks they are on their way.

udp_open ( &socket, 6400, -1, 6500, datahandler )

I have tried udp_bypass_arp without success.

I have tried two sockets without success.

I have decreased the rate to two per second without any change.

DC 9.62 with patches.

Any thoughts on how to get more of the packets in Win 7?

Thanks.

I have tried udp_bypass_arp without success.

I have tried two sockets without success.

DC 9.62 with patches.

Any thoughts on how to get more of the packets in Win 7?

Thanks.

Jan Axelson

  • Administrator
  • Frequent Contributor
  • *****
  • Posts: 2511
    • Lakeview Research
Re: RCM3200 UDP packets lost
« Reply #1 on: June 01, 2015, 08:49:52 pm »
I have no specific advice, but if you haven't done so, a web search on:

udp drop packets windows 7

brings up a number of discussions on this or similar issues.