Re: [quicwg/base-drafts] recovery: clarifying the priority of Probe packet contents (#3780)

[Junho Choi <[e-mail]>]

> Logically it should be the most urgent data among all the available streams.

I think this is the right answer but need some clarification on the draft text.

I think there is 2 different approach for the content of Probe packet depending on the role of Probe packet: 1) if the tail loss is most concerning (what's what I understand from TLP) then we would send a new data if available, or newest lost to move the right edge and update ACK ranges. 2) If HoL is most concerning then we would send oldest lost data (or highest priority data) to move the left edge (but it may be delivered already, because we may lost some acks)

However the draft says we always try to send a new data first regardless of lost data, so I assume 1). But if the priority is simply on the urgent data, we don't need to send a new data first.


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