perfSONAR User Q&A and Other Discussion

[Matthew Woodward <>]

Also, you'd be limited to a max of 480Mbps (although it would probably 
be less than that, say, ~300Mbps) since USB2 tops out at that speed.

- M

On 2/28/17 3:16 PM, Steven Wallace wrote:
> I’m planning something similar. One issue that others have raised is that the 
> pi’s ethernet interface uses a USB controller, resulting in a fair amount of 
> jitter for delay testing.
>
>
>
>
>
> > On Nov 21, 2016, at 4:13 PM, Ryan Harden 
> > <>
> >  wrote:
> >
> > Hello,
> >
> > I’m digging up an old topic here, (yes I’ve read the archives) but I’m 
> > curious what the current state of affairs is. The most recent conversations I 
> > can find date back to 2014.
> >
> > I’m working on building a low-cost perfSonar mesh to measure loss and latency 
> > (throughput isn’t a requirement) across our campus. My goal is to build 
> > something that can be deployed quickly and easily in either a permanent or 
> > temporary fashion. Predictably, the RPi3 looks very attractive for this, so 
> > I’ve acquired four to experiment with. I’m not looking for ns latency 
> > resolution, just obvious spikes in latency that something like an RPi can 
> > detect in a reliable way.
> >
> > My goals are:
> > 1) Power via PoE (done with adapter)
> > 2) Run basic perfSonar packages (perhaps rebuilt for ARM?)
> > 3) Gather wireless connection/auth statistics.
> > 4) Run with zero local disk (PXE boot? NFS?) (Cycle PoE port triggers 
> > software upgrade, etc)
> > 5) Run periodic latency/loss tests. (think 30 second 1Mbps UDP tests, nothing 
> > crazy)
> >
> > Has anyone already worked on this? Any notes specifically for the RPi3? It’s 
> > significantly faster and has some upgraded hardware over the original/RPi2 
> > versions.
> > Given the relatively low investment so far, I could reset and go for a small 
> > x86 device, but I’d prefer to stick with the RP if I can.
> >
> > Thanks
> >
> > /Ryan
> >
> > Ryan Harden
> > Research and Advanced Networking Architect
> > University of Chicago - ASN160
> > P: 773.834.5441