Re: [quicwg/base-drafts] Clarify ACK Delay and reference host-delay (#3971)

[Martin Thomson <[e-mail]>]

@martinthomson commented on this pull request.



> +: A variable-length integer representing the intentional delay in microseconds
+  between when the largest acknowledged packet, as indicated in the Largest
+  Acknowledged field, was received, and when the ACK frame was sent;
+  see {{host-delay}}.  The value of the ACK Delay field is scaled by

Including the encoding/unit details in the description makes this a very hard sentence to swallow.  I can only think of ways to make this longer though...

This value represents the length of the delay between when the largest acknowledged packet, as indicated in the Largest Acknowledged field, was received, and when the ACK frame was sent; see {{host-delay}}.  ACK Delay is encoded as a variable-length integer with a value that is derived by dividing the delay in microseconds by 2 to the power of the value of the ack_delay_exponent transport parameter set by the sender of the ACK frame; see {{transport-parameter-definitions}}.  To decode the value, the encoded variable-length integer value is multiplied by 2 to the power of the ack_delay_exponent transport parameter to obtain a value in microseconds.  Scaling in this fashion allows ...

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