The RACK-TLP Loss Detection Algorithm for TCP

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Publisher: IETF
Doc Type: Standard
Pages: 29
Abstract: This document presents the RACK-TLP loss detection algorithm for TCP. RACK-TLP uses per-segment transmit timestamps and selective acknowledgments (SACKs) and has two parts. Recent Acknowledgment (RACK) starts fast recovery quickly using time-based inferences derived from acknowledgment (ACK) feedback, and Tail Loss Probe (TLP) leverages RACK and sends a probe packet to trigger ACK feedback to avoid retransmission timeout (RTO) events. Compared to the widely used duplicate acknowledgment (DupAck) threshold approach, RACK-TLP detects losses more efficiently when there are application-limited flights of data, lost retransmissions, or data packet reordering events. It is intended to be an alternative to the DupAck threshold approach.
Publication Date: 2021-02-01
Status Note: Proposed Standard
DOI: 10.17487/RFC8985
Link: https://doi.org/10.17487/RFC8985
Author(s): Yuchung Cheng
Neal Cardwell
Nandita Dukkipati
Priyaranjan Jha
Keyword(s): TCP Loss Recovery, Reordering

Latest version of IETF RFC 8985

Document Versions — IETF RFC 8985

▶ IETF RFC 8985 (2021-02-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

IETF RFC 793 [Superseded*]
IETF RFC 2018 [Active*]
IETF RFC 2119 [Active*]
IETF RFC 2883 [Active*]
IETF RFC 5681 [Active*]
IETF RFC 6298 [Active*]
IETF RFC 6675 [Active*]
IETF RFC 7323 [Active*]
IETF RFC 8174 [Active*]

Bibliographic Reference(s)

10.1145-248157.248181 — FACK EXTERNAL
10.1145-505696.505704 — SCWA99 EXTERNAL
10.1145-2068816.2068832 — DMCG11 EXTERNAL
10.1145-2934872.2934873 — POLICER16 EXTERNAL
IETF.draft-ietf-quic-recovery-34 — I-D.ietf-quic-recovery EXTERNAL
Winstein, K., Sivaraman, A., and H. Balakrishnan, "Stochastic Forecasts Achieve High Throughput and Low Delay over Cellular Networks", 10th USENIX Symposium on Networked Systems Design and Implementation (NSDI '13)", 2013. EXTERNAL
IETF RFC 3042 [Active*]
IETF RFC 3522 [Active*]
IETF RFC 4653 [Active*]
IETF RFC 5682 [Active*]
IETF RFC 5827 [Active*]
IETF RFC 6937 [Superseded*]
RFC7765 — RFC7765 EXTERNAL

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IETF RFC 8985, The RACK-TLP Loss Detection Algorithm for TCP
doi: 10.17487/RFC8985
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Referenced By

IETF draft-cardwell-iccrg-bbr-congestion-control-02 [Active*]
IETF RFC 9002 [Active*]
IETF RFC 9330 [Active*]
IETF RFC 9331 [Active*]
IETF RFC 9438 [Active*]
IETF RFC 9937 [Active*]