Re: [quicwg/base-drafts] Desirable behavior when it takes time to derive the traffic keys for the next PN space (#3821)

[ianswett <[e-mail]>]

One more note is that the RTT samples can be greatly inflated if a packet(ie: the Initial) is lost and the PTO fires to retransmit the data, and that causes the previously buffered Handshake packets to be acknowledged.  Coalescing an ack-eliciting Handshake packet with the Initial typically mitigates this, as long as it's processed before the buffered packets.  Since coalescing is already an optimization in the draft, it may be worth a note that it can prevent inflated RTT samples.

We've observed some cases where this causes the handshake to timeout because the server's PTO is so long, and our handshake timeout is fairly short(9 or 10 seconds).

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