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janaiyengar committed Apr 16, 2019
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Showing 1 changed file with 5 additions and 4 deletions.
9 changes: 5 additions & 4 deletions draft-ietf-quic-recovery.md
Expand Up @@ -488,10 +488,11 @@ Using max(SRTT, latest_RTT) protects from the two following cases:

An endpoint might consistently record RTT samples as 0 in extremely low latency
networks, leading to a smoothed_rtt of 0. Consequently, the endpoint could
declare all packets as lost immediately upon receiving an acknowledgement for a
later packet. That is, the endpoint would not provide any reordering tolerance.
To avoid declaring packets as lost too early, the time threshold MUST be set to
at least kGranularity (defined in {{ld-consts-of-interest}}).
declare all earlier packets as lost immediately upon receiving an
acknowledgement for a later packet. That is, the endpoint would not provide any
reordering tolerance. To avoid declaring packets as lost too early, the time
threshold MUST be set to at least kGranularity (defined in
{{ld-consts-of-interest}}).

Implementations MAY experiment with absolute thresholds, thresholds from
previous connections, adaptive thresholds, or including RTT variance. Smaller
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