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change CE behaviour only when threshold > 1 #277

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Mar 4, 2024
Merged

change CE behaviour only when threshold > 1 #277

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change CE behaviour only when threshold > 1
mirjak Feb 5, 2024
7676819
Update draft-ietf-quic-ack-frequency.md
mirjak Mar 1, 2024
113fd26
Update draft-ietf-quic-ack-frequency.md
mirjak Mar 4, 2024
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11 changes: 8 additions & 3 deletions draft-ietf-quic-ack-frequency.md
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Expand Up @@ -412,9 +412,14 @@ a Reordering Threshold of 2.

## Expediting Explicit Congestion Notification (ECN) Signals {#congestion}

An endpoint SHOULD send an immediate acknowledgment when a packet marked
with the ECN Congestion Experienced (CE) {{?RFC3168}} codepoint in the IP
header is received and the previously received packet was not marked CE.
If the Ack-Eliciting Threshold is larger than 1, an endpoint SHOULD send
an immediate acknowledgement when a packet marked with the ECN Congestion
Experienced (CE) {{?RFC3168}} codepoint in the IP header is received and
the previously received packet was not marked CE. From there on, if multiple
CE-marked packets are received in a row or only non-CE-marked packet received,
the endpoint resumes to sending acknowledgements based on the Ack-Eliciting
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Threshold or max_ack_delay. That means only when a transition from non-CE-marked
to CE-marked occurs an immediate acknowledgement is sent.
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Doing this maintains the peer's response time to congestion events, while also
reducing the ACK rate compared to {{Section 13.2.1 of QUIC-TRANSPORT}} during
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