perfSONAR User Q&A and Other Discussion

[Jeremy Palmer <>]

I see this fairly often with my Loss and Latency (OWAMP) tests. These 
non-functional tests will show up as orange "Unable to retrieve data" boxes on 
my Perfsonar Dashboard from time to time. I have no idea what causes these 
checks to stop running, but in almost all cases the non-working checks are 
between hosts that are experiencing some packet loss between them.
I've always guessed its the packet loss or maybe NTP sync that causes the tests 
to stop working. The tests will usually fix themselves after a few hours or 
days, or if I reboot the hosts.

Jeremy Palmer
Senior Network Engineer
ViaWest, Inc.
Office: 720.891.1045
Fax: 303-874-5236
http://www.viawest.com

On 12/1/2014 3:43 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.
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