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Excess ack_delay could be non-compiance #4218

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merged 5 commits into from Oct 15, 2020
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Excess ack_delay could be non-compiance #4218

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Excess ack_delay could be non-compiance
ianswett Oct 15, 2020
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Update draft-ietf-quic-recovery.md
ianswett Oct 15, 2020
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Update draft-ietf-quic-recovery.md
ianswett Oct 15, 2020
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4 changes: 2 additions & 2 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -353,7 +353,7 @@ samples, and rttvar is the variation in the RTT samples, estimated using a
mean variation.

The calculation of smoothed_rtt uses RTT samples after adjusting them for
acknowledgement delays. Excess delays are computed using the ACK Delay field of
acknowledgement delays. These delays are computed using the ACK Delay field of
the ACK frame as described in Section 19.3 of {{QUIC-TRANSPORT}}.

The peer might report acknowledgement delays that are larger than the peer's
Expand All @@ -374,7 +374,7 @@ min_rtt.
After the handshake is confirmed, any acknowledgement delays reported by the
peer that are greater than the peer's max_ack_delay are attributed to
unintentional but potentially repeating delays, such as scheduler latency at the
peer or loss of previous acknowledgements. These delays could also be due to
peer or loss of previous acknowledgements. Excess delays could also be due to
a non-compliant implementaton. Therefore, these extra delays are
considered effectively part of path delay and incorporated into the RTT
estimate.
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