Date: Wed, 07 Nov 2018 01:04:40 -0800
From: Bob Briscoe <notifications@github.com>
Reply-To: quicwg/base-drafts
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Message-ID: <quicwg/base-drafts/issues/1978/436553339@github.com>
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Subject: Re: [quicwg/base-drafts] Sender-Controlled Delayed ACK Ratio (#1978)
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### Units

Packets? bytes? time? fraction of RTT? 

Think of this question in two stages:
Q1. what units the sender starts from 
Q2. what units the message is in, which the sender has to derive from Q1

If the message was a fraction of 1 RTT, the receiver would have to calulate the sender's RTT. It can do that, using ACKs of ACKs, but that implies work and delay.

In all cases that I could see in #1428, the sender had all the info to translate from one unit to another (it knows its own SMSS, its window, its RTT). This leaves Q2, to which a good enough answer is packets (which also compresses the message size). 


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<h3>Units</h3>
<p>Packets? bytes? time? fraction of RTT?</p>
<p>Think of this question in two stages:<br>
Q1. what units the sender starts from<br>
Q2. what units the message is in, which the sender has to derive from Q1<=
/p>
<p>If the message was a fraction of 1 RTT, the receiver would have to cal=
ulate the sender's RTT. It can do that, using ACKs of ACKs, but that impl=
ies work and delay.</p>
<p>In all cases that I could see in <a class=3D"issue-link js-issue-link"=
 data-error-text=3D"Failed to load issue title" data-id=3D"330174604" dat=
a-permission-text=3D"Issue title is private" data-url=3D"https://github.c=
om/quicwg/base-drafts/issues/1428" data-hovercard-type=3D"issue" data-hov=
ercard-url=3D"/quicwg/base-drafts/issues/1428/hovercard" href=3D"https://=
github.com/quicwg/base-drafts/issues/1428">#1428</a>, the sender had all =
the info to translate from one unit to another (it knows its own SMSS, it=
s window, its RTT). This leaves Q2, to which a good enough answer is pack=
ets (which also compresses the message size).</p>

<p style=3D"font-size:small;-webkit-text-size-adjust:none;color:#666;">&m=
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 derive from Q1\r\n\r\nIf the message was a fraction of 1 RTT, the receiv=
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 ACKs, but that implies work and delay.\r\n\r\nIn all cases that I could =
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