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Re: Multi-path QUIC Extension Experiments

Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com> Tue, 20 July 2021 10:17 UTC

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Subject: Re: Multi-path QUIC Extension Experiments
From: Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>
In-Reply-To: <41414E77-B01A-4EC1-9FF7-37A03DA5EF5A@eggert.org>
Date: Tue, 20 Jul 2021 12:17:21 +0200
Cc: Roberto Peon <fenix=40fb.com@dmarc.ietf.org>, quic <quic@ietf.org>, "matt.joras" <matt.joras@gmail.com>, 李振宇 <zyli@ict.ac.cn>, Christian Huitema <huitema@huitema.net>, Charles 'Buck' Krasic <charles.krasic@gmail.com>, "lucaspardue.24.7" <lucaspardue.24.7@gmail.com>, Yanmei Liu <miaoji.lym@alibaba-inc.com>, Yunfei Ma <yfmascgy@gmail.com>, Yunfei Ma <yunfei.ma@alibaba-inc.com>, Qing An <anqing.aq@alibaba-inc.com>, Mirja Kühlewind <mirja.kuehlewind@ericsson.com>
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To: Lars Eggert <lars@eggert.org>
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> There has been a long-standing assumption that if you exercised a path in the (recent) past you can probably assume that the properties haven't changed much if you want to start exercising it again. This is why heuristics like caching path properties (RTTs, etc.) are often of benefit - often, but not always, and maybe never in some scenarios (e.g., overcommitted CGNs.)

This is rough assumption for WiFi. I just measured one laptop on a WiFi n network going from no service to 1Mb/s to 10Mb/s moving only a few meters, and then 100Mb/s moving some more. You can rapidly transition between a network being available and not available, and if you do not handle some heuristics, you can get some bad artefacts. Mobile can of course also vary a lot when going from 4G to 3G to no signal in a tunnel on a train.

Mikkel

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