ndt-users list created

["Pepmiller, Craig E." <>]

Ok, so this is only seen when the NDT machine is configured for multiple
simultaneous clients?

Thanks-
-Craig

-----Original Message-----
From: Richard Carlson 
[mailto:]
 
Sent: Wednesday, October 12, 2005 2:56 PM
To: Clayton Keller; 

Subject: Re: Slow Inbound Tests

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