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Clarify how the initial CWND is limited #4740

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merged 3 commits into from Jan 13, 2021
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Clarify how the initial CWND is limited #4740

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Clarify how the initial CWND is limited
ianswett Jan 13, 2021
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Update draft-ietf-quic-recovery.md
ianswett Jan 13, 2021
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ianswett Jan 13, 2021
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9 changes: 5 additions & 4 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -825,10 +825,11 @@ peer-reported ECN-CE count increases; see Section 13.4.2 of {{QUIC-TRANSPORT}}.

QUIC begins every connection in slow start with the congestion window set to
an initial value. Endpoints SHOULD use an initial congestion window of 10 times
the maximum datagram size (max_datagram_size), limited to the larger of 14720
bytes or twice the maximum datagram size. This follows the analysis and
recommendations in {{?RFC6928}}, increasing the byte limit to account for the
smaller 8-byte overhead of UDP compared to the 20-byte overhead for TCP.
the maximum datagram size (max_datagram_size), while limiting the window
to the larger of 14720 bytes or twice the maximum datagram size. This follows
the analysis and recommendations in {{?RFC6928}}, increasing the byte limit to
account for the smaller 8-byte overhead of UDP compared to the 20-byte overhead
for TCP.

If the maximum datagram size changes during the connection, the initial
congestion window SHOULD be recalculated with the new size. If the maximum
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