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Re: Preparing for discussion on what to do about the multipath extension milestone

Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be> Wed, 30 September 2020 14:52 UTC

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Reply-To: Olivier.Bonaventure@uclouvain.be
Subject: Re: Preparing for discussion on what to do about the multipath extension milestone
To: Lucas Pardue <lucaspardue.24.7@gmail.com>
Cc: Matt Joras <matt.joras@gmail.com>, QUIC WG <quic@ietf.org>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
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From: Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be>
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Lucas,

> 
> Personally, I think starting on a basis of ignoring QUIC transport's 
> core method of exchanging application data is a bad idea.

I'm not suggesting that. I suggest that we first agree on the basic 
multipath mechanisms without taking too much time to discuss different 
and diverging application requirements. These mechanisms obviously need 
to take into account the core characteristics of QUIC. One example is 
that in contrast with MPTCP, MPQUIC acknowledgements do not necessarily 
need to be transmitted over the same "path" as the data that they 
acknowledge. This gives more freedom to an MPQUIC implementation than an 
MPTCP one. Another example are the flow control frames. Once we agree on 
these application-independent mechanisms, then we can start to discuss 
about policies and how to handle them.


Olivier

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