Re: [quicwg/base-drafts] Add details of marking packets lost on PTO (#2624)

ianswett <> Thu, 18 April 2019 21:37 UTC

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Subject: Re: [quicwg/base-drafts] Add details of marking packets lost on PTO (#2624)
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ianswett commented on this pull request.

> +When a PTO timer expires, a sender MUST send at least one ack-eliciting packet
+as a probe, unless there is no data available to send.  An endpoint MAY send up
+to two ack-eliciting packets, to avoid an expensive consecutive PTO expiration
+due to a single packet loss.
+It is possible that the sender has no new or previously-sent data to send.  As
+an example, consider the following sequence of events: new application data is
+sent in a STREAM frame, deemed lost, then retransmitted in a new packet, and
+then the original transmission is acknowledged.  In the absence of any new
+application data, a PTO timer expiration now would find the sender with no new
+or previously-sent data to send.
+When there is no data to send, the sender SHOULD send a PING or other
+ack-eliciting frame in a single packet, re-arming the PTO timer.
+Alternatively, instead of sending the ack-eliciting packet, the sender MAY mark

Alternatively, instead of sending an ack-eliciting packet, the sender MAY mark

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