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

[Nitinder Mohan <mohan@in.tum.de>]

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Hi Brennen,

Super cool that Ookla supports this now. Gives a more realistic picture of the end-to-end connection :)

A quick question on the methodology. Do you report the RTTs from the same “warmed-up” TCP connection which is being used for download/upload or do you issue parallel ICMP/TCP pings alongside the download/upload TCP connection to report these latencies?

Thanks and Regards

Nitinder Mohan
Technical University Munich (TUM)
https://www.nitindermohan.com/

From: Brennen Smith <brennen@ookla.com>
Reply: Brennen Smith <brennen@ookla.com>
Date: 13. May 2022 at 01:49:52
To: Dave Taht <dave.taht@gmail.com>
Cc: starlink@lists.bufferbloat.net <starlink@lists.bufferbloat.net>
Subject:  Re: [Starlink] ookla's latest speedtest app does latency under load  

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
2. We use a "warmed up" TCP connection for latency 
3. We use the interquartile mean for the "displayed value"

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

Cheers,

Brennen Smith
VP Technology

(206) 739-0807 | brennen@ookla.com
linkedin.com/in/brennensmith


On Thu, May 12, 2022 at 4:18 PM Dave Taht <dave.taht@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@nathan.io> wrote:
Here's a test I did today: https://www.speedtest.net/my-result/i/5112435305  




On Thu, May 12, 2022 at 4:04 PM Dave Taht <dave.taht@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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