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Retransmitting ACK frames can inflate RTT #3048

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Retransmitting ACK frames can inflate RTT #3048

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Retransmitting ACK frames can inflate RTT
ianswett Sep 17, 2019
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Update draft-ietf-quic-recovery.md
ianswett Sep 18, 2019
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7 changes: 7 additions & 0 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -291,6 +291,13 @@ are received within an RTT. As suggested in {{?RFC6298}}, doing so might result
in inadequate history in smoothed_rtt and rttvar. Ensuring that RTT estimates
retain sufficient history is an open research question.

### Retransmitted ACK frames

Section 13.3 of {{QUIC-TRANSPORT}} recommends sending the most recent set of
acknowledgements in ACK frames, but if ACK frames are retransmitted, an inflated
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RTT can be measured. Some incorrect RTT samples are prevented by only measuring
RTT when the largest acknowledged increases.

## Estimating min_rtt {#min-rtt}

min_rtt is the minimum RTT observed over the lifetime of the connection.
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