[Flent-users] [tohojo/flent] packet loss stats (#106)

Dave Taht dave.taht at gmail.com
Mon Nov 20 23:14:13 EET 2017

On Mon, Nov 20, 2017 at 5:21 AM, Toke Høiland-Jørgensen <
notifications at github.com> wrote:

> Pete Heist <notifications at github.com> writes:
> >> On Nov 20, 2017, at 1:11 PM, Toke Høiland-Jørgensen <
> notifications at github.com> wrote:
> >>
> >> Pete Heist <notifications at github.com> writes:
> >>
> >> > G.711 can be simulated today with `-i 20ms -l 172 -fill rand
> >> > -fillall`. I do this test pretty often, and I think it would be a good
> >> > default voip test.
> >>
> >> The problem with this is that it also changes the sampling rate. I don't
> >> necessarily want to plot the latency every 20ms, so I'd have to
> >> compensate for that in the Flent plotter somehow. Also, a better way to
> >> deal with loss would be needed.
> >
> >
> > I wondered if/when this would come up… Why not plot the latency every
> > 20ms, too dense?
> For the current plot type (where data points are connected by lines),
> certainly. It would probably be possible to plot denser data sets by a
> point cloud type plot, but that would make denser data series harder to
> read.

Winstein plot of latency variance? It doesn't get denser, it gets darker.

Packet loss vs throughput?

> > I guess even if not, eventually at a low enough interval the round
> > trip and plotting intervals would need to be decoupled, no matter what
> > plot type is used.
> Yeah, exactly.
> > If we want to minimize flent changes, irtt could optionally produce a
> > `round_trip_snapshots` (name TBD) array in the json with elements
> > created at a specified interval (`-si duration` or similar) that would
> > summarize the data from multiple round trips. For each snapshot, there
> > would be no timestamps, but the start and end seqnos would be there
> > (if needed), mean delays and ipdv, counts (or percentages?) of lost,
> > lost_up or lost_down, etc. I’d need to spec this out, but would
> > something like this help?
> Hmm, seeing as we probably want to keep all the data points in the Flent
> data file anyway, I think we might as well do the sub-sampling in Flent.
> Just thinning the plots is a few lines of numpy code; just need to
> figure out a good place to apply it.
> Handling loss is another matter, but one that I need to deal with
> anyway. Right now I'm just throwing away lost data points entirely,
> which loses the lost_{up,down} information. Will fix that and also
> figure out the right way to indicate losses.


> -Toke
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Dave Täht
CEO, TekLibre, LLC
Tel: 1-669-226-2619
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