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

Jana Iyengar <notifications@github.com> Mon, 08 April 2019 22:14 UTC

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Subject: Re: [quicwg/base-drafts] Reduce restrictions on valid RTT samples (#2568)
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@marten-seemann: I agree with @nibanks that tracking non-ack-eliciting packets shouldn't be much additional load, but I don't think that's necessary.

If an ACK acknowledges packets that you don't know about, they've been acked or they're non-ack-eliciting. Either ways, this ACK should not generate a valid RTT sample.

I'll also note that you are not required to use every ACK that acks any ack-eliciting packets for an RTT sample.  If you're not tracking a packet, you can't use it's ack for an RTT measurement.  Ignoring these ACKs is the only way forward, and the text will allow that.

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