[Starlink] ookla's latest speedtest app does latency under load

[Möller, Sebastian]

Hi Brennan,

really cool stuff!


On May 13, 2022, at 01:35, Brennen Smith <brennen at ookla.com<mailto:brennen at ookla.com>> wrote:

Hey all,

Here's some details about the final figures:

1. Loaded latency is simply an extension of the latency stage - same methodology and medium

Where could I find a technical description of that method?

2. We use a "warmed up" TCP connection for latency

Is that one of the load bearing flows or a non load bearing parallel flow that has successfully finished the TCP handshake?

3. We use the interquartile mean for the "displayed value"

I wonder whether reporting something like a 95 or 99% quantiles (so either 1& and 99%, or 5% and 95%) in addition to min and max and interquartile mean would be possible? And since you use the 25 and 75% values already, maybe these as well?

Awesome seeing those numbers in the wild and looking forward to bringing more awareness to this issue.

For sure, so far many discussions about debugging/reducing bufferbloat started with people wanting to use the ubiquitious speedtest.nat nodes (where finding a close by one typically is easy/possible); and now this will actually work (assuming they use Android or iOS clients).

Question: will the apps for the other OSs as well as the CLI and the web version also be changed to include these numbers in the foreseeable future?


Kind Regards
Sebastian



Cheers,

Brennen Smith

VP Technology

(206) 739-0807 | brennen at ookla.com<mailto:brennen at ookla.com>
linkedin.com/in/brennensmith


On Thu, May 12, 2022 at 4:18 PM Dave Taht <dave.taht at gmail.com> wrote:
Yea. peak 2500ms latency on download, 600ms on upload, that's about right. :/ The upload figure appears to be a bit lower (better) than what I measured 1 year ago, here (for the 30 or so new subscribers on this list, this was why I started it): https://docs.google.com/document/d/1puRjUVxJ6cCv-rgQ_zn-jWZU9ae0jZbFATLf4PQKblM/edit

I don't know if ookla are throwing out arp related stuff, or using the 99th percentile to calculate the final figure. I hope to learn more about their calculations in the coming weeks.

I do keep hoping we can get more updated flent data over longer intervals than 20s. With starlink changing their allocation scheme every 15s, what number do you pick?

And like I said, some packet caps of this app would be good, too.



On Thu, May 12, 2022 at 4:07 PM Nathan Owens <nathan at nathan.io> wrote:
Here's a test I did today: https://www.speedtest.net/my-result/i/5112435305

[cid:180ba86ed9c36eb9f291]


On Thu, May 12, 2022 at 4:04 PM Dave Taht <dave.taht at gmail.com> wrote:
Ookla has just put out an ios and android app that also continuously
measures latency under load.

I'm interested in calibrating the results of that vs a vs flent
benchmarks verses starlink. Can someone here give this a shot? More
details here:


https://www.ookla.com/articles/introducing-loaded-latency

IDEALLY, this would be over wifi -> starlink , with a packet capture
in the middle. But I'd settle for a few test results from starlink
folk of this new app, first.

--
FQ World Domination pending: https://blog.cerowrt.org/post/state_of_fq_codel/
Dave Täht CEO, TekLibre, LLC
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--
FQ World Domination pending: https://blog.cerowrt.org/post/state_of_fq_codel/
Dave Täht CEO, TekLibre, LLC


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