[quicwg/base-drafts] Byte counting at Congestion avoidance (#3917)

[Junho Choi <[e-mail]>]

There is an issue in current congestion avoidance pseudocode
when `max_datagram_size * acked_packet.sent_bytes < congestion_window`
cwnd increment effectively becomes zero, especially because most
implementations use integer operation to calculate cwnd.

This happens when `acked_packet.sent_bytes` is a small value or
`congestion_window` is very big. It may lead to too conversavative
cwnd growth during congestion avoidance.

To fix the issue, I propose to use a TCP ABC style cwnd growth
during congestion avoidance: https://www.rfc-editor.org/rfc/rfc3465.html#section-2.1

Basically it stores accumulated acked bytes in a new
variable `bytes_acked` and increate cwnd by `max_datagram_size` when
`bytes_acked` reaches to cwnd.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/3917

-- Commit Summary --

  * Byte counting at Congestion avoidance

-- File Changes --

    M draft-ietf-quic-recovery.md (13)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/3917.patch
https://github.com/quicwg/base-drafts/pull/3917.diff

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