target = "https://www.rfc-editor.org/rfc/rfc9002#section-6.1"

# 6.1.  Acknowledgment-Based Detection
#
# Acknowledgment-based loss detection implements the spirit of TCP's
# Fast Retransmit [RFC5681], Early Retransmit [RFC5827], Forward
# Acknowledgment [FACK], SACK loss recovery [RFC6675], and RACK-TLP
# [RFC8985].  This section provides an overview of how these algorithms
# are implemented in QUIC.
# 
# A packet is declared lost if it meets all of the following
# conditions:
# 
# *  The packet is unacknowledged, in flight, and was sent prior to an
#    acknowledged packet.
# 
# *  The packet was sent kPacketThreshold packets before an
#    acknowledged packet (Section 6.1.1), or it was sent long enough in
#    the past (Section 6.1.2).
# 
# The acknowledgment indicates that a packet sent later was delivered,
# and the packet and time thresholds provide some tolerance for packet
# reordering.
# 
# Spuriously declaring packets as lost leads to unnecessary
# retransmissions and may result in degraded performance due to the
# actions of the congestion controller upon detecting loss.
# Implementations can detect spurious retransmissions and increase the
# packet or time reordering threshold to reduce future spurious
# retransmissions and loss events.  Implementations with adaptive time
# thresholds MAY choose to start with smaller initial reordering
# thresholds to minimize recovery latency.

[[spec]]
level = "MAY"
quote = '''
Implementations with adaptive time
thresholds MAY choose to start with smaller initial reordering
thresholds to minimize recovery latency.
'''