perfSONAR User Q&A and Other Discussion

[Aaron Brown <>]

Hey Ty,

What time does the loss spike occur? If the iperf3 processes aren’t running 
parallel with the owampd ones, I’d not expect huge spikes like that. There 
aren’t any powstream processes running are there? Beyond that, my only guess 
is some other traffic that happens to hit at roughly the same time (possibly 
another UDP 100M test that happens to share a path or something).

Cheers,
Aaron 

> On Mar 9, 2015, at 9:25 AM, Ty Bell 
> <>
>  wrote:
> 
> Hi All,
> 
> I’ve been using regular testing with bwping (owamp) and bwctl (iperf3). 
> Every 6 hours I run a 20 second 100Mbps UDP test, and what I’m seeing in 
> the graphs are very large loss spikes when the UDP tests run. In the logs, 
> I see the iperf3 test accepted at 20:56:01, it says 62 seconds until the 
> results are available. I see 9 owamp processes exit (the final at 
> 20:56:38), at 20:57:03 the iperf3 test completes and then all of the owamp 
> connections re-establish. During the iperf test, if I look at the process 
> list, I can see iperf3 is the only thing running, no owamp or owping.
> 
> Any ideas what could be causing the loss? No errors or drops on the NICs.
> 
> 
> Thanks,
> Ty