ndt-users list created

[Rich Carlson <>]

Alex;

As Jason noted, there is an ISO image available with the NDT and other 
tools installed.  You could boot this image in a VM if you are just 
testing, or native boot it on a spare machine.

More comments in-line

On 5/10/2010 6:28 PM, Alex. S. wrote:
> Hi,
>
> Since the last week, I had been trying to setup a server to test ndt
> just for fun.
>
> I tried with ubuntu 8.04 LTS, kernels 2.6.33, 2.6.32, 2.6.31, and 2.6.24
> (and their respective web100 patches), web100 userland 1.7, but with
> varying grades of compilation success I was not able to test ndt on my
> virtual machine.
>
> At the end, my best shot was a version of ndt server and client (3.6.2b)
> passing the checks for middleboxes, but failing the client to server and
> server to client tests with messages like "S2C throughput test FAILED!".
> The worst cases were when the ndt client didn't even pass the checks for
> middleboxes with "Checking for Middleboxes Protocol error  missed text
> message!"

While the 3.6.2b package should work, the 3.4.4a package is still the 
best place to start.  The 3.5.x and 3.6.x packages have code to support 
multiple simultaneous clients and this work has caused some 
'difficulities' (I'm the main code developer so I can say this .-)

Unless you need multi-client mode operations I recommend the 3.4.4a package.
> Tonight I'm going to try the instructions at
> https://wiki.chpc.utah.edu/display/CyberInfrastructureLab/Network+Performance+Measurement+Server+using+Fedora+Core+9
> using these exact software versions to see.
>
> Before of that I was wondering if there exists a sort of VirtualBox or
> VMWare image ready for use with ndt (with the right version of web100).
> If it is, can you point me to there ?
>
> Why is this compilation so difficult?, Is there any methods to validate
> if everything goes well in every stage? how can I know if the web100
> patched kernel is doing well (besides the message "web100 initialization
> was successful" in dmesg),
The web100 package is very stable.  To see if it is installed and 
working properly do the following
1) verify there is a /proc/web100 directory and a /proc/web100/header 
file.  If not, the kernel patch was not installed or activated.

2) run the /usr/local/bin/readall utility from the web100 userland 
library as 'root'.  This will print out details from every open 
connection, demonstrating that the userland library and kernel patch are 
operating.

3) if your system has IPv6 enabled, then the NDT daemon (web100srv) may 
tickle a bug in the web100 userland library.  If this happens run the 
daemon with the -4 flag to see if it operates properly.  If it does the 
apply the patch to the web100 library code, recompile/reinstall it to 
eliminate this bug.
 how can I check if the web100 userland was
> correctly installed and if it is functioning properly?, how can I know
> what to blame in case of something goes wrong?, what are the most
> "stable" combination of software versions involved to try?
See above, start with NDT-3.4.4a and follow the NDT users email list for 
announcements on when the 3.6.x release is out of 'beta' testing.

Rich

> Thank you very much for your time and your responses.
>
>
>
> A.