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[iccrg] [tcpm] New draft: https://datatracker.ietf.org/doc/html/draft-scheffenegger-tcpm-lrd-00

"Scheffenegger, Richard" <rs.ietf@gmx.at> Fri, 12 March 2021 17:33 UTC

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To: iccrg IRTF list <iccrg@irtf.org>, tcpm IETF list <tcpm@ietf.org>, core@ietf.org
References: <161529694562.32408.1003733576456029769@ietfa.amsl.com> <24aa2c28-41e3-6a14-7ffa-88418745c154@bobbriscoe.net>
From: "Scheffenegger, Richard" <rs.ietf@gmx.at>
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Date: Fri, 12 Mar 2021 18:33:40 +0100
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Subject: [iccrg] [tcpm] New draft: https://datatracker.ietf.org/doc/html/draft-scheffenegger-tcpm-lrd-00
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Hi,

After some discussion, I got convinced to formally submit a draft,
explicitly describing a simple lost retransmission detection mechanism
to prevent RTO when a retransmission is lost.

While full featured stacks can address this issue within the RFC series
already by using TCP RACK, on a more constrained platform where only
SACK support is viable but not RACK, this mechanism may be an
interesting alternative.

Thererfore cross-posting to CORE, in addition to TCPM. ICCRG is
included, as it may be the case that current implementations which
recover from lost retransmissions may not actually use this as a
subsequent congestion control signal, and retain the ssthresh / cwnd
from the initial loss recovery - and it is certainly debatable, if
a single, or two engagements of a CC reaction is in order.

The mechansim described is very conservative (another CC reaction, and
requires more data to be sent, to have high confidence when
retransmitting a prior retransmission).

https://datatracker.ietf.org/doc/html/draft-scheffenegger-tcpm-lrd-00

(The graph in the appendix needs some overhaul, as PRR is becoming
standard).

Best regards,
    Richard

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