perfSONAR User Q&A and Other Discussion

[Jason Zurawski <>]

Hey Daniel;

Would you be able to provide a link to your node, or send along a screenshot, 
to give us a better idea of what you are seeing?

Off the top of my head, here are a couple of typical reasons that tests could 
fail:

        - Firewalls in the path denying access to ports, or not enough ports 
available for the number of tests that are running

        - Lack of testing ‘slots’ available on one side or the other

        - NTP synchronization issues

        - Packet loss that prevents the test from starting or finishing.  

If you send along your /var/log/perfsonar/owamp_bwctl.log file, we can have a 
look to see what may be menacing your node.  The other thing you can try is 
some by-hand tests, something like:

        bwctl -f m -x -T iperf3 -t 30 -i 1 -c HOST1 -s HOST2

Thanks;

-jason

On Dec 1, 2014, at 5:43 PM, Daniel Schmidt 
<>
 wrote:

> I've noticed strange behavior on our throughput tests at one site.  
> Sometimes, the graph turn unidirectional - ie, one way stops working.  
> Sometimes, both ways will stop working.  The times are random.  Although 
> the site is verified up by ping and passes traffic, however the throughput 
> graphs vary greatly.  (We believe due to issues with this circuit)
> 
> I've only seen it do this in this one case.  It's almost like it gets angry 
> that the speed varies vastly and gives up.  
> 
> Has anybody else encountered this?  Any ideas greatly appreciated.