Preparing for discussion on what to do about the multipath extension milestone (was: Re: IETF Last Call for QUIC)

[Spencer Dawkins at IETF <[e-mail]>]

Dear QUIC working group,

On Fri, Sep 25, 2020 at 5:00 AM Lars Eggert <[e-mail]> wrote:

> In parallel to progressing the "base drafts" towards RFC publications, the
> WG should now also begin to pick up the pace on our other adopted work
> items (ops drafts, extensions, etc.)
>
> One important other discussion item is what to do about the multipath
> extension milestone, which some have suggested should be dropped, while
> others still show interest to pursue it.
>

So, I'd like to understand the suggestion to drop this milestone, before I
start trying to discuss that suggestion :-).

In conversations with individual folk, I've heard these concerns about QUIC
multipath:

- Whether it will be possible to evaluate multipath performance at scale,
both for evaluating proposals and testing implementations.

- The complexity involved in making decisions dynamically about which path
to send a given packet on (which could be a research topic, given certain
constraints and goals).

If I've misunderstood or misquoted, my apologies, of course. Please
correct me.

What other concerns do people have? I'd like to get all the objections out
at the beginning of the discussion.

Thanks!

Spencer