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Attempt to define slow start/congestion avoidance #4005

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merged 9 commits into from Sep 4, 2020
Merged

Attempt to define slow start/congestion avoidance #4005

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2a9cb75
Attempt to define slow start/congestion avoidance
martinthomson Aug 17, 2020
2f3927e
detected/increased
martinthomson Aug 17, 2020
755f59a
Integrate the changes from #3978
martinthomson Aug 18, 2020
2775fdd
ssthresh being initiallly infinite means that you start in slow start
martinthomson Aug 18, 2020
bb96175
Reword congestion signal response
martinthomson Aug 25, 2020
4478c2b
Merge branch 'master' into define-ss-ca
martinthomson Aug 25, 2020
72c57b9
Merge remote-tracking branch 'origin/ianswett-must-new-reno' into def…
martinthomson Aug 25, 2020
fb99434
Merge branch 'master' into define-ss-ca
martinthomson Sep 1, 2020
3ad13ce
Sprinkle some NewReno pixie dust
martinthomson Sep 1, 2020
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15 changes: 9 additions & 6 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -788,13 +788,16 @@ approach that increases the congestion window by one maximum datagram size per
congestion window acknowledged. A congestion controller MUST NOT increase the
congestion window by more than this amount.

When first entering congestion avoidance, when a packet is declared lost, or
when the ECN-CE count is increased, the congestion controller described in this
document halves the congestion window, reduces the slow start threshold to the
resulting size, and enters the recovery period. A congestion controller MUST
reduce the congestion window when a loss or ECN-CE marking is detected.
The congestion controller described in this document, when not in the
recovery period ({{recovery}}), MUST take the following steps when first
entering congestion avoidance, when a packet is declared lost, or when
the ECN-CE count is increased:

## Recovery Period
* halve the congestion window,
* set the slow start threshold to the size of the reduced congestion window, and
* enter the recovery period.

## Recovery Period {#recovery}

A recovery period is entered when loss or ECN-CE marking of a packet is
detected in congestion avoidance after the congestion window and slow start
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