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

Dave Taht dave.taht at gmail.com
Mon Nov 20 23:44:53 EET 2017


A goal for me has been to be able to run Opus at 24 bit, 96Khz, with 2.7ms
sampling latency.
Actually getting 8 channels of that through a loaded box would be mahvelous.



On Mon, Nov 20, 2017 at 1:14 PM, Dave Taht <dave.taht at gmail.com> wrote:

>
>
> 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.
>>
>
> Groovy.
>
>
>> -Toke
>>
>>>> You are receiving this because you commented.
>> Reply to this email directly, view it on GitHub
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>
>
> --
>
> Dave Täht
> CEO, TekLibre, LLC
> http://www.teklibre.com
> Tel: 1-669-226-2619 <(669)%20226-2619>
>



-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619
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