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Re: [quicwg/base-drafts] HoLB from NCID frames (#1280)

Mike Bishop <notifications@github.com> Mon, 09 April 2018 21:02 UTC

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Date: Mon, 09 Apr 2018 21:01:48 +0000
From: Mike Bishop <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] HoLB from NCID frames (#1280)
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The issue here is that the server is currently using CID1 and the packet number has reached A.  It has received:
- CID3, gap Y packets
- CID4, gap Z packets

Missing in flight is the frame that says "CID2, gap X packets".  It can't use CID3 because it needs to go to packet number A + X + Y, but X is unknown.

So optimistic ACK protection is fine.  You don't need there to be no gaps in your own packet number sequence; you need to not be required to introduce a particular gap in your own packet number space that was specified by your peer.

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