NDT-DEV email list created

Status: New
Owner: ----
Labels: Type-Defect Severity-Medium

New issue 79 by : Option --adminview on  
web100srv(ndtd) causes calculation failures since 3.6.5+
http://code.google.com/p/ndt/issues/detail?id=79

While testing the next version of NDT for M-Lab, I have observed that since  
version 3.6.5 up to the current HEAD, the option "--adminview" or "-a"  
causes various calculation errors, for instance with  
max_theoretical_throughput, that are exposed to the client applet.

To reproduce this behavior, build and run a recent NDT server, provide the  
following command line arguments:

    WEB100SRV_OPTIONS="-a -dddddd --log_dir $SLICEDATADIR "
    WEB100SRV_OPTIONS+="--snaplog --tcpdump --cputime --multiple "
    WEB100SRV_OPTIONS+=" --max_clients=40"

With these options, as a result of the calculation error, invalid  
information is returned to the client applet, which generates an error:

    Error parsing test results!
    java.lang.NumberFormatException: For input string: "-nan"

If you then click on 'More Details...', notice that the list of values  
stops at "bw: -nan":
    ...
    link: 100
    congestion: 1
    bad_cable: 0
    mismatch: 0
    spd: 10.24
    bw: -nan

The value "bw:" corresponds to the, max_theoretical_thruput calculation.   
If you look in the server output you will see something like:

    --packetloss=1 over 8950=0.000112. Link spd=6
    --packets out of order: 0.040060
    --max_theoretical_thruput: -nan. From 1448,0.159434,0.000112
    --window sizes: SndWinScale= -1077280188, RcvwinScale=-1077280184,
    rwin=-0.203188, swin=-0.203187, cwin=-0.203208

There is some corruption occurring, since the input values for the  
max_theoretical_throughput are ok, but the result "-nan" is wrong.  Also,  
the *winScale values are clearly incorrect.

When the "--adminview" option is removed from the server, the calculations  
are performed successfully.

So, a short-term work-around is to disable the option.  However, it is  
clearly a bug that enabling this feature results in incorrect calculations  
exposed to the client.

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