ndt-users list created

[Clayton Keller <>]

Richard Carlson wrote:
> 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

Thanks Richard,

I've got a test box I will apply and test to, then look at applying this 
to the live box and get some good "in the field testing". I'll let you 
know how things go.

Clay