Re: [quicwg/base-drafts] QUIC flow control is not quite like HTTP/2 (#3766)

Martin Thomson <> Tue, 16 June 2020 22:24 UTC

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Date: Tue, 16 Jun 2020 15:23:59 -0700
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] QUIC flow control is not quite like HTTP/2 (#3766)
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@martinthomson commented on this pull request.

> +frame with the Stream ID field set appropriately.  A MAX_STREAM_DATA frame
+indicates the maximum absolute byte offset of a stream.  A receiver could use the
+current offset of data consumed to determine the flow control offset to be
+advertised. A receiver MAY send MAX_STREAM_DATA frames in multiple packets in
+order to make sure that the sender receives an update before running out of
+flow control, even if one of the packets is lost.
+A receiver can advertise a larger limit for a connection by sending a MAX_DATA
+frame, which indicates the maximum of the sum of the absolute byte offsets of
+all streams.  A receiver maintains a cumulative sum of bytes received on all
+streams, which is used to check for flow control violations. A receiver might
+use a sum of bytes consumed on all streams to determine the maximum data limit
+to be advertised.
+Once a receiver advertises an offset for the connection or a stream, it MAY
+advertise a smaller offset, but this has no effect.

advertise a smaller limit, but this has no effect.

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