[Bloat] the future belongs to pacing

Matt Mathis mattmathis at google.com
Sun Jul 5 19:06:42 EDT 2020

What the complexity buys you is that BBRs metrics max_BW, min_RTT, and the
ACK aggregation/batching metrics are actual parameters of the network, and
observable with passive instrumentation of the packet streams.  Traditional
CC is a collection of heuristics to estimate cwnd, which has a clear
interpretation in terms of action (when to send), but the optimal cwnd
can't easily be observed from the packet stream.

I think this alone will have impact, in terms of being able to reason about
CC behaviors.

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
            too weak risks being mistaken for tacit approval.

On Sun, Jul 5, 2020 at 11:13 AM Jonathan Morton <chromatix99 at gmail.com>

> > On 5 Jul, 2020, at 9:09 pm, Stephen Hemminger <
> stephen at networkplumber.org> wrote:
> >
> > I keep wondering how BBR will respond to intermediaries that aggregate
> packets.
> > At higher speeds, won't packet trains happen and would it not get
> confused
> > by this? Or is its measurement interval long enough that it doesn't
> matter.
> Up-thread, there was mention of patches related to wifi.  Aggregation is
> precisely one of the things that would address.  I should note that the
> brief description I gave glossed over a lot of fine details of BBR's
> implementation, which include careful filtering and conditioning of the
> data it gathers about the network path.
> I'm not altogether a fan of such complexity.
>  - Jonathan Morton
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