[Cse461] packet loss in emulator?

From: Matthew Burkhart (burkhart_at_cs.washington.edu)
Date: Sun Feb 22 2004 - 15:42:58 PST

  • Next message: Janet Davis: "[Cse461] Re: Turnin?"

    We were trying run our test cases for the turnin and we cannot get the
    simulator or emulator to produce any packet loss!
    We looked in the code and found that that schedulePkt(src, size, now)
    method in topology.rb (which causes packet loss) is not used at all in
    the emulator/trawler. Ok so the emulator can't do packet loss...?

    So we then tried the simulator it didnt work immediately, so we checked
    out the code and found two issues:
    lossRate = $1.to_f if opts =~ /lossRate:\s*([0-9\.]+(:?[eE]\d*)?)/
    so our topo file should use "lossRate: 0.05" instead of "loss: 0.05"?
    Furthermore, the $POSTMATCH use in parseEdgeOptions($POSTMATCH) is nil
    ONLY when we run simulator, but parses correctly in the trawler.
    What is going on here?? What are we missing? Have you all been able to
    get packet loss to work?
    My ruby is up to date:
    ## ruby1.8 --version
    ruby 1.8.1 (2004-02-03) [i386-linux]
    Should we just hard code the default loss rate in simulator to 0.05?
    Thanks!

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