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Re: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today

"Holland, Jake" <jholland@akamai.com> Fri, 25 March 2022 08:56 UTC

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From: "Holland, Jake" <jholland@akamai.com>
To: Michael Welzl <michawe@ifi.uio.no>, Nicolas Kuhn <nicolas.kuhn.ietf@gmail.com>
CC: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "panrg@irtf.org" <panrg@irtf.org>
Thread-Topic: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today
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Date: Fri, 25 Mar 2022 08:56:41 +0000
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Subject: Re: [PANRG] About Keith and Michael's proposal on sidecar protocols in PANRG today
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> From: Michael Welzl <michawe@ifi.uio.no>
> Date: Thu,2022-03-24 at 3:50 PM
>> Moreover, with QUIC the multipath extension negotiation would hardly be seen by a proxy, right ? 
>
> Yes, that’s right. The SC proxy might not know that multipath is even in use… does it need to know about it though?

It seems relevant to some of the MP-QUIC statements about
congestion control.

If MP-QUIC lands on the LIA or OLIA stuff, then for a shared path
upstream of the PEP, the CC would react appropriately I think, but
for a shared path downstream of the PEP where the PEP doesn't know
about MP or the cwnd of other sub-flows, the PEP's transmit would
presumably(?) hit the same problems that drove OLIA's development,
I think.

Traditionally of course a TCP PEP would just ignore this, since
it's kind of doing an undocumented hack anyway.  But with all the
explicit communication with the PEP in this scenario it might be
possible to do something, which might either make the docs (and
perhaps even the implementations and the signaling) somewhat more
complex or force a doc to acknowledge that the RFC series's views
on congestion control can be a bit of a naive fiction these days
in some regards (or both).

-Jake

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