Re: [quicwg/base-drafts] Add more context and text around ACK frequency (#3706)

Jana Iyengar <> Fri, 29 May 2020 05:41 UTC

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Date: Thu, 28 May 2020 22:41:04 -0700
From: Jana Iyengar <>
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Subject: Re: [quicwg/base-drafts] Add more context and text around ACK frequency (#3706)
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@janaiyengar commented on this pull request.

-Packets containing only ACK frames are not congestion controlled, so there are
-limits on how frequently they can be sent.  An endpoint MUST NOT send more than
-one ACK-frame-only packet in response to receiving an ack-eliciting packet.  An
-endpoint MUST NOT send a non-ack-eliciting packet in response to a
-non-ack-eliciting packet, even if there are packet gaps which precede the
-received packet. Limiting ACK frames avoids an infinite feedback loop of
-acknowledgements, which could prevent the connection from ever becoming idle.
-However, the endpoint acknowledges non-ACK-eliciting packets when it sends an
-ACK frame.
+### Acknowledgement Frequency
+A receiver determines how frequently to send acknowledgements in response to
+ack-eliciting packets. This determination involves a tradeoff however.
+Endpoints rely on timely acknowledgment to detect loss; see Section X of

Gah! Sorry, meant to replace that.

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