Re: [Cse461] packet loss in emulator?

From: Janet Davis (jlnd_at_cs.washington.edu)
Date: Sun Feb 22 2004 - 17:26:43 PST

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    On Sun, 22 Feb 2004, Matthew Burkhart wrote:

    > 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?

    Looks like we screwed up. Thanks for debugging; this should help Evan
    straighten it out.

    > Should we just hard code the default loss rate in simulator to 0.05?

    That sounds like a fine idea.

    Cheers,
    Janet 

    -- 
Janet Davis
jlnd_at_cs.washington.edu
http://www.cs.washington.edu/homes/jlnd/
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