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 <[email protected]> on behalf of Matt Mathis via Bloat <[email protected]> Reply-To: Matt Mathis <[email protected]> Date: Tuesday, August 10, 2021 at 00:52 To: "[email protected]" <[email protected]> Cc: bloat <[email protected]> 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$> . Thanks, --MM-- The best way to predict the future is to create it. - Alan Kay We must not tolerate intolerance; however our response must be carefully measured: too strong would be hypocritical and risks spiraling out of control; too weak risks being mistaken for tacit approval. On Mon, Aug 9, 2021 at 5:27 PM Dave Collier-Brown <[email protected]<mailto:[email protected]>> wrote: Knowing programmers, I'd more likely assume latency when it's easiest to measure. At a guess, either * average of upload or download * average of download (as it comes first) --dave (call me "Wally" (:-)) c-b On 2021-08-09 4:24 p.m., Jonathan Morton wrote: On 9 Aug, 2021, at 10:25 pm, Dave Collier-Brown <[email protected]><mailto:[email protected]> wrote: My run of it reported latency, but without any qualifiers... One would reasonable assume that's idle latency, then. - Jonathan Morton _______________________________________________ Bloat mailing list [email protected]<mailto:[email protected]> https://lists.bufferbloat.net/listinfo/bloat<https://urldefense.com/v3/__https:/lists.bufferbloat.net/listinfo/bloat__;!!CQl3mcHX2A!WTavRmT2GnSUSVpvPCPdmBuNtOJI_zDP1WOHE-jy8tMiXBE-CxDospZUjNote1Oa4DQV1Q$> -- David Collier-Brown, | Always do right. This will gratify System Programmer and Author | some people and astonish the rest [email protected]<mailto:[email protected]> | -- Mark Twain CONFIDENTIALITY NOTICE AND DISCLAIMER : This telecommunication, including any and all attachments, contains confidential information intended only for the person(s) to whom it is addressed. Any dissemination, distribution, copying or disclosure is strictly prohibited and is not a waiver of confidentiality. If you have received this telecommunication in error, please notify the sender immediately by return electronic mail and delete the message from your inbox and deleted items folders. This telecommunication does not constitute an express or implied agreement to conduct transactions by electronic means, nor does it constitute a contract offer, a contract amendment or an acceptance of a contract offer. Contract terms contained in this telecommunication are subject to legal review and the completion of formal documentation and are not binding until same is confirmed in writing and has been signed by an authorized signatory. _______________________________________________ Bloat mailing list [email protected]<mailto:[email protected]> https://lists.bufferbloat.net/listinfo/bloat<https://urldefense.com/v3/__https:/lists.bufferbloat.net/listinfo/bloat__;!!CQl3mcHX2A!WTavRmT2GnSUSVpvPCPdmBuNtOJI_zDP1WOHE-jy8tMiXBE-CxDospZUjNote1Oa4DQV1Q$>
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