Re: [quicwg/base-drafts] SHOULD NOT include platform delay in ack delay (#2786)

Martin Thomson <> Fri, 14 June 2019 03:32 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] SHOULD NOT include platform delay in ack delay (#2786)
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martinthomson approved this pull request.

Even better now than before!

We should merge this before it starts getting worse.

> @@ -302,15 +302,15 @@ continue making forward progress.
 ## 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, which is important 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 MAY include these delays when populating the
-Ack Delay field in an ACK frame.
+An endpoint measures the intentional delay between when an ACK-eliciting packet

An endpoint measures the delays intentionally added between when an ACK-eliciting packet

(This blows out the line length.)

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