Re: [quicwg/base-drafts] Clarify ACK of ACKs and bundling a PING (#2794)

[ianswett <[e-mail]>]

ianswett commented on this pull request.



> -received packet that contains frames other than ACK and PADDING frames.
-An endpoint MUST NOT send a packet containing only an ACK frame in response
-to a packet containing only ACK or PADDING frames, even if there are packet
-gaps which precede the received packet. This prevents an indefinite feedback
-loop of ACKs. The endpoint MUST however acknowledge packets containing only
-ACK or PADDING frames when sending ACK frames in response to other packets.
+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 packet containing only an ACK frame per received ACK-eliciting packet
+(one containing frames other than ACK and/or PADDING).  An endpoint MUST NOT
+send a packet containing only an ACK frame in response to a non-ACK-eliciting
+packet (one containing only ACK and/or PADDING frames), even if there are
+packet gaps which precede the received packet. This prevents an indefinite
+feedback loop of acknowledgements, which may prevent the connection from ever
+becoming idle. The endpoint MUST however acknowledge non-ACK-eliciting packets
+when sending ACK frames in response to other packets.

We can say it differently, but it's important to say somewhere that non-ACK-eliciting packets are ACKed when an ACK is sent.

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