ndt-users list created

[Richard Carlson <>]

Hi Clayton;

This is a bug in the web100srv code.  I forgot to shutdown the control 
socket at the end of the test.  If there are multiple clients then the 
final results are sent in a LIFO manner, so the first client needs to wait 
until all subsequent clients are done before the results are returned.

I'll issue a patched version soon.  In the mean time you can patch your 
version by hand by adding the line "shutdown(ctlsockfd, SHUT_RDWR);" to the 
web100srv.c file (on line 1126).

Let me know if that fixes things.

Rich


---------------------------------------------------------------
Original code:
        if (admin_view == 1) {
            totalcnt = calculate(SumRTT, CountRTT, CongestionSignals, 
PktsOut, DupAcksIn, AckPktsIn,
                        CurrentMSS, SndLimTimeRwin, SndLimTimeCwnd, 
SndLimTimeSender,
                        MaxRwinRcvd, CurrentCwnd, Sndbuf, DataBytesOut, 
mismatch, bad_cable,
                        (int)bwout, (int)bwin, c2sdata, s2cack, 1, debug);
            gen_html((int)bwout, (int)bwin, MinRTT, PktsRetrans, Timeouts,
                        Sndbuf, MaxRwinRcvd, CurrentCwnd, mismatch, 
bad_cable, totalcnt,
                        debug);
        }

        /* printf("Saved data to log file\n"); */

        /* exit(0); */
}

main(argc, argv)

----------------------------------------------------------
Modified code
        if (admin_view == 1) {
            totalcnt = calculate(SumRTT, CountRTT, CongestionSignals, 
PktsOut, DupAcksIn, AckPktsIn,
                        CurrentMSS, SndLimTimeRwin, SndLimTimeCwnd, 
SndLimTimeSender,
                        MaxRwinRcvd, CurrentCwnd, Sndbuf, DataBytesOut, 
mismatch, bad_cable,
                        (int)bwout, (int)bwin, c2sdata, s2cack, 1, debug);
            gen_html((int)bwout, (int)bwin, MinRTT, PktsRetrans, Timeouts,
                        Sndbuf, MaxRwinRcvd, CurrentCwnd, mismatch, 
bad_cable, totalcnt,
                        debug);
        }
        shutdown(ctlsockfd, SHUT_RDWR);
        /* printf("Saved data to log file\n"); */

        /* exit(0); */
}

main(argc, argv)




At 01:54 PM 10/12/2005, Clayton Keller wrote:
> I wanted to address this to the list. I believe there was a similar post a 
> week or so back but I wanted to address this clean.
>
> I currently have web100srv running from /etc/init.d/ndt with the following:
>
> /usr/local/sbin/web100srv -a -m -l /var/log/web100/web100srv.log
>
> The system is running on Fedora Core 4 using a patached 2.6.13 kernel from 
> kernel.org.
>
> The server itself is also sitting behind a PIX firewall.
>
> We have noticed that the Outbound Test will run rather quickly, but when 
> the Inbound, server to client, test is ran it can take upwards of several 
> minutes to complete, many times as much as 4 minutes. There are other 
> times where from the end user's point-of-view it appears the test never 
> completes although you can see results for the test appear in the 
> web100.log file. The test though will continue to sit on the unning 10s 
> inbound test (server to client) . . . . . .  portion of the test, and many 
> users are beginning to just close out the window.
>
> At this point I am looking for general issues that I can look into and 
> possibly run debug against as far as these tests are concerned.
>
> Clayton Keller

------------------------------------



Richard A. Carlson                              e-mail: 

Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104