Re: [quicwg/base-drafts] Rewrite of RTT estimation section (#2592)

[ianswett <[e-mail]>]

ianswett commented on this pull request.



> -On every newly acknowledged ack-eliciting largest acked:
+## Measuring and Reporting Host Delay {#host-delay}
+
+An endpoint measures the delay incurred between when a packet is received and
+when the corresponding acknowledgment is sent.  The endpoint encodes this host
+delay for the largest acknowledged packet in the Ack Delay field of an ACK frame
+(see Section 19.3 of {{QUIC-TRANSPORT}}).  This allows the receiver of the ACK
+to adjust for any host delays - importantly, for delayed acknowledgements - when
+estimating the path RTT.  In certain deployments, a packet might be held in the
+OS kernel or elsewhere on the host before being processed by the QUIC
+stack. Where possible, an endpoint SHOULD include these delays when populating
+the Ack Delay field in an ACK frame.
+
+An endpoint MUST NOT excessively delay acknowledgements of ack-eliciting
+packets.  The maximum ack delay is communicated in the max_ack_delay transport
+parameter, see Section 18.1 of {{QUIC-TRANSPORT}}.  max_ack_delay implies an

Yeah, not in love with it here, but I'm failing to convince you, so let's leave it as is.

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