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Re: [quicwg/base-drafts] Allow removal of ACK blocks that are in flight (#917)

MikkelFJ <notifications@github.com> Sun, 12 November 2017 14:55 UTC

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Date: Sun, 12 Nov 2017 14:55:16 +0000
From: MikkelFJ <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Allow removal of ACK blocks that are in flight (#917)
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> Can you help me understand the pathological case when something is ACK’d, omitted, then ACK’d again? 

With sufficiently many holes, e.g. loosing every second package because one of two routing paths are faulty, the number of ack blocks could grow large enough to force having to drop some due to limitations in space dedicated to ACK frames.

Eventually the faulty link unblocks and packets gets through. A number of destinct ACK blocks collapses into fewer blocks because the gaps disappear.

Avoiding ACK'ing already acked packets might keep the ACK block unnecessarily high.

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