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Re: Proposal to replace ACK block count with ACK length

Christian Huitema <huitema@huitema.net> Sat, 16 June 2018 07:10 UTC

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From: Christian Huitema <huitema@huitema.net>
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Date: Sat, 16 Jun 2018 00:10:42 -0700
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Subject: Re: Proposal to replace ACK block count with ACK length
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On 6/15/2018 6:57 PM, Kazuho Oku wrote:

> And I think that the proposed change would be fine because it does not
> necessary increase the size of the ACK frame, if we remove ACK Block
> Count field in exchange.
Ack block count is generally one byte, the length would have to be two
bytes most of the time, especially if one wants to avoid 2 passes. So
that's one extra byte.
> Instead of relying on the field, a receiver of the ACK frame can read
> blocks until it consumes the number of bytes specified by the length
> of the frame.
Modulo handling of ECN counters, of course. In the ECN proposal, we have
three varints at the end of the ack frame, and that would make parsing a
variable number of ack blocks more interesting. So if we take the length
proposal, we have to make sure that the ECN counters  get moved before
the ack blocks.

-- Christian Huitema

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