Re: [quicwg/base-drafts] Reduce restrictions on valid RTT samples (#2568)

Marten Seemann <> Mon, 08 April 2019 02:49 UTC

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From: Marten Seemann <>
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Subject: Re: [quicwg/base-drafts] Reduce restrictions on valid RTT samples (#2568)
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> With this principle in place, I think it still makes sense to make the first change I proposed: that an ACK should be used for RTT measurement if any packet it newly acks is ack-eliciting. The RTT measurement is still on the largest_acked (since ack-delay is reported for the largest_acked).

The problem with this change is that it requires a sender to keep state for non-ack-eliciting. Currently, in my implementation, I only save a sent packet (including its metadata like the time sent and the packet size) if that packet is ack-eliciting.

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