perfSONAR User Q&A and Other Discussion

[Brian Candler <>]

On 11/12/2014 13:56, Aaron Brown wrote:
> That’s just bizarre. These hosts weren’t running NTP, right? I can only guess 
> that bwctl is doing something funky with error estimates when NTP isn’t 
> running.
Correct.  Well, they are running ntpd, but are unsynced due to port 123 
blocking. All peers show state .INIT.

I did not try making them peers to each other.

> Are these boxes going to be running NTP in the field? If so, 
hopefully that may fix things...

Yes, they will have a proper unfiltered Internet connection, and as you 
say they may be fine.  I did notice a posting from someone else a while 
back about performance tests only being logged in one direction, but 
that could be an unrelated problem.  It's frustrating when I see a 
problem and can't pin it down; I was up to midnight last night on this :-)

Anyway, I'm just about to pack up the boxes for shipping. Right now they 
are telling me that the test will take 15 seconds, but it actually 
finishes in 6.5 seconds with no results returned.  owping is showing a 
latency of -6/6ms, so clearly the clocks are pretty close to each other, 
and well within the default error estimate of 0.1s.

Regards,

Brian.