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Re: nits in draft-ietf-quic-recovery-05

Christian Huitema <huitema@huitema.net> Tue, 12 September 2017 01:10 UTC

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From: Christian Huitema <huitema@huitema.net>
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Date: Mon, 11 Sep 2017 18:09:58 -0700
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Subject: Re: nits in draft-ietf-quic-recovery-05
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On 9/11/2017 2:41 PM, Jana Iyengar wrote:
>
> Oh, right, I missed that. Thanks for clarifying, I'll fix it (change
> to "marks a packet as lost when a packet with a larger packet number
> is acknowledged.")

Except that's not true, because that simple statement does not take into
account possible out of order deliveries. Indeed, the overview says: "A
packet is marked as lost if at least one packet that was sent a
threshold number of packets (kReorderingThreshold) after it has been
acknowledged." But the overview is not correct either, because it does
not consider time. A packet could still be marked as lost if
"time_reordering_fraction + kDelayedAckTimeout" has elapsed since
receiving an acknowledgement of a packet with a larger number.

-- 
Christian Huitema

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