[Bloat] [Rpm] Airbnb

[Livingood, Jason]

Great news, Matt! If I may make a recommendation, IMO a standalone working latency test would have greater utility than integrating such a measurement into an existing test & so it may have the opportunity of more widespread usage.

JL

From: Bloat <bloat-bounces at lists.bufferbloat.net> on behalf of Matt Mathis via Bloat <bloat at lists.bufferbloat.net>
Reply-To: Matt Mathis <mattmathis at google.com>
Date: Tuesday, August 10, 2021 at 00:52
To: "dave.collier-brown at indexexchange.com" <dave.collier-brown at indexexchange.com>
Cc: bloat <bloat at lists.bufferbloat.net>
Subject: Re: [Bloat] [Rpm] Airbnb

I am part of the M-Lab team.

For years we published a "jitter" metric that I considered to be bogus, basically max_rtt - min_rtt, (which were builtin Web100 instruments).

In 2019, we transitioned from web100 to "standard" linux tcp_info, which does not capture max_rtt.   Since the web100 jitter was viewed as bogus, we did not attempt to reconstruct it, although we could have.   Designing and implementing a new latency metric was on my todo list from the beginning of that transition, but chronically preempted by more pressing problems.

It finally made it to the top of my queue which is why I am suddenly not lurking here and the new rpm list.  I was very happy to see the Apple responsiveness metric, and realized that M-Lab can implement a TCP version of it, that can be computed both in real time on future tests and retroactively over archived tests collected over the last 12 years.

This quick paper might be of interest: Preliminary Longitudinal Study of Internet Responsiveness<https://urldefense.com/v3/__https:/docs.google.com/document/d/1HkeJTgwLdbbdHe0dF9SWrpr8Vt7ngnovLpdDTScuUtk/edit*heading=h.sy6m01i6oa9a__;Iw!!CQl3mcHX2A!WTavRmT2GnSUSVpvPCPdmBuNtOJI_zDP1WOHE-jy8tMiXBE-CxDospZUjNote1PXn0DhWQ$>
.
Thanks,
--MM--
The best way to predict the future is to create it.  - Alan Kay

We must not tolerate intolerance;
       however our response must be carefully measured:
            too strong would be hypocritical and risks spiraling out of control;
            too weak risks being mistaken for tacit approval.


On Mon, Aug 9, 2021 at 5:27 PM Dave Collier-Brown <dave.collier-brown at indexexchange.com<mailto:dave.collier-brown at indexexchange.com>> wrote:

Knowing programmers, I'd more likely assume latency when it's easiest to measure. At a guess, either

  *   average of upload or download
  *   average of download (as it comes first)

--dave (call me "Wally" (:-)) c-b



On 2021-08-09 4:24 p.m., Jonathan Morton wrote:

On 9 Aug, 2021, at 10:25 pm, Dave Collier-Brown <dave.collier-brown at indexexchange.com><mailto:dave.collier-brown at indexexchange.com> wrote:



My run of it reported latency, but without any qualifiers...

One would reasonable assume that's idle latency, then.



 - Jonathan Morton

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David Collier-Brown,         | Always do right. This will gratify

System Programmer and Author | some people and astonish the rest

dave.collier-brown at indexexchange.com<mailto:dave.collier-brown at indexexchange.com> |              -- Mark Twain


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