wi problem with message > 7400 bytes

From: Daniel Eischen (eischen_at_vigrid.com)
Date: 10/31/03

  • Next message: supraexpress_at_globaleyes.net: "Re: kernel hangs with SMP/Hyperthreading" 
    Date: Thu, 30 Oct 2003 21:12:32 -0500 (EST)
To: current@freebsd.org

    Greetings,

    I'm having a problem receiving UDP messages over a wi interface:

    wi1: <Dell TrueMobile 1150 Series PC Card> at port 0x180-0x1bf irq 11 function 0 config 1 on pccard0
    wi1: 802.11 address: 00:02:2d:4a:d8:7d
    wi1: using Lucent Technologies, WaveLAN/IEEE
    wi1: Lucent Firmware: Station (6.10.1)
    wi1: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps

    (wi0 is also a 'Dell TrueMobile 1150 Series PC Card' in
     a mini-PCI card, but hangs the system when you try and
     configure it -- so it obviously isn't configured in this
     set up.)

    I have a small program that does a trivial UDP test:

      http://people.freebsd.org/~deischen/udptest.c

    My results show that:

      o Receiving large (> 7400 bytes) messages does not work.

      o Sending large messages works.

      o Sending & receiving large messages over a wired
        interface (dc, fxp, etc) works.

    Am I suppose to be able to receive UDP messages larger
    than 7400 bytes over the air?

    To run the above test:

      # On one machine, run it as a server (it just echoes
      # the messages back to the client).
      #
      $ udptest -D

      # On the wireless machine, run it as a client (it
      # sends a message to the server and waits for the
      # echoed response).
      #
      $ udptest -D -c -a <server's ip address> -m <message size>

    If I set message size to 7392 (plus an 8 byte header
    in my message = 7400), everything works. Anything
    higher and I never receive the response.

    Thanks

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