Re: [quicwg/base-drafts] DPLPMTU merge tweaks (#3702)

msvoelker <> Fri, 29 May 2020 12:56 UTC

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Date: Fri, 29 May 2020 05:56:03 -0700
From: msvoelker <>
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Subject: Re: [quicwg/base-drafts] DPLPMTU merge tweaks (#3702)
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@msvoelker commented on this pull request.

> +
+From the perspective of DPLPMTUD, QUIC transport is an acknowledged
+packetization layer (PL). A sender can therefore enter the DPLPMTUD BASE state
+when the QUIC connection handshake has been completed.
+### Sending QUIC DPLPMTUD Probe Packets
+DPLPMTU probe packets are ack-eliciting packets.  Probe packets that use the
+PADDING frame implement "Probing using padding data", as defined in
+Section 4.1 of {{!DPLPMTUD}}.  Endpoints could limit the content of probe
+packets to PING and PADDING frames as packets that are larger than the current
+maximum packet size are more likely to be dropped by the network.
+DPLPMTU probe packets consume congestion window, which could delay subsequent
+transmission by an application.

Does this makes sense? (I merged both paragraphs in the section)

... Endpoints could limit the content of probe packets to PING and PADDING frames as packets that are larger than the current maximum packet size are more likely to be dropped by the network. These frames might not be retransmitted if a probe packet containing them is lost. Additionally, a lost probe packet should not be treated as a signal of congestion. However, these probe packets do consume congestion window, which could delay the transmission of subsequent application data.

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