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More text on ACK rate in the applicability draft #386

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More text on ACK rate in the applicability draft #386

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More text on ACK rate in the applicability draft
mirjak Jun 2, 2021
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white space of course...
mirjak Jun 2, 2021
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Apply suggestions from Ian
mirjak Jun 2, 2021
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More or less proposed text by MT
mirjak Jun 30, 2021
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16 changes: 13 additions & 3 deletions draft-ietf-quic-applicability.md
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Expand Up @@ -565,11 +565,21 @@ RESET_STREAM frames, which contain only an error code.

# ACK-only packets on constrained links

The stragegy on sending acknowlegdements in QUIC version 1 is adopted from
TCP, meaning that usually an QUIC implementation is expected to send one
packet containing an ACK frame for each two packets received.
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The cost of sending acknowledgments - in processing cost or link
utilization - could be a significant proportion of available resources if
these resources are constrained. Reducing the rate at which acknowledgments
are generated can preserve these resources and improve overall performance,
for both network processing as well as application-relevant metrics.
these resources are constrained. With TCP network based mechanisim exists
that perform so called ACK thining in such situations. As "only-ACK" packets
are not reliably detecable in QUIC and drop of those packets can have larger
performance impcats than with TCP, network based ACK thining is not suitable
for QUIC traffic. Instead QUIC endpoint need to control the ACK rate
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/instead QUIC endpoint need/instead a QUIC endpoint needs/

appropriately and some implenentation may even provide an interface to
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/some implementation may even provide an interface to impact/implementations provide an interface that can reduce/ ??? ... although I like MT's comment also which avoids this.

impact the amount of ACK traffic sent. Reducing the rate at which
acknowledgments are generated can preserve constraint resources and
in such a situation improve overall performance, for both network processing
as well as application-relevant metrics.
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# Port Selection and Application Endpoint Discovery {#ports}

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