Re: [quicwg/base-drafts] Ack Delay and TLP (#1796)

ianswett <> Tue, 25 September 2018 17:21 UTC

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Subject: Re: [quicwg/base-drafts] Ack Delay and TLP (#1796)
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ianswett commented on this pull request.

> @@ -365,7 +352,11 @@ receiver.
 The timer duration, or Probe Timeout (PTO), is set based on the following
-* PTO SHOULD be scheduled for max(1.5*SRTT+MaxAckDelay, kMinTLPTimeout)
+* If less than 2400 bytes are in flight, PTO SHOULD be scheduled for

My understanding is that TCP waits for 2 full-sized packets, so I was trying to specify something similar to that in bytes.  The issue here becomes what constitutes a full-sized packet if the packet size changes?  Maybe keeping a max received packet size is reasonable?

We can add a packet count, but it's yet another variable to track and I don't think receiving two tiny packets would cause an immediate ACK in TCP, so I wouldn't expect it to in QUIC.

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