ndt-users list created

[Richard Carlson <>]

Hi Dwight;

Interesting.  Did these 5 reports come from the same PC client?  For 
logs 1 & 4 you see a large packet loss rate (0.7%) and a huge number 
of out-of-order packets (~70%).  I also notice that the number of 
packets sent/received is very low (under 1000).  On log 3 the loss 
rate is less than .001% and the OOO rate is .45%.

So my initial analysis is that the low speed is due to the server not 
sending any traffic (700 packets at 1260 Bytes/pkt over 11 seconds is 
a very low number).  At this point it is not sure why this sending 
rate is so low.  To find out more you will need to add some more 
options to the server.

1) add the -t flag to the web100srv process.  This will generate 
tcpdump files for later analysis

2) add the --snaplog flag to the web100srv process.  This will 
generate Web100 snaplog files for later analysis

3) add the --cputime flag to the web100srv process.  This will trace 
the CPU utilization numbers, if the CUP is busy then the send rate will be low.

Add these 3 flags to the web100srv process and send me a set of sample traces.

Rich

> Mr. Carlson, for you consideration.
>
> I am writing to you to report that I am having a similar issue with 
> NDT that was reported by Mr. Kidwell. The issue is poor throughput 
> from NDT server to client. This issue seems to be associated with my 
> Windows desktops only. I've run the test from a couple different 
> Linux desktops with complete success.
>
> If I run the NDT server with the --avoidsndblockup switch, the 
> Windows desktop will have a good run about 50% of the time. I get 
> these results if I use the browser applet or the standalone client.
>
> My test network consists of an IBM 335 server running a Linux 
> version 2.6.22-web100 kernel and web100_userland-1.6. The NDT server 
> is ndt-3.4.1. The server and client are connected to the same Cisco 
> 2950 Ethernet switch.
>
> If you wish to access my NDT server, the URL is 
> <http://69.1.171.5:7123>http://69.1.171.5:7123.
>
> The attached files are the data from a few runs of the Windows 
> standalone client.
>
> Thanks.
> Dwight.
>
> <<ndt5.txt>> <<ndt1.txt>> <<ndt2.txt>> <<ndt3.txt>> <<ndt4.txt>>
>
>
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------------------------------------



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