Re: [quicwg/base-drafts] Moving text on spinbit into transport (#2364)

Marcus Ihlar <> Thu, 24 January 2019 09:47 UTC

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From: Marcus Ihlar <>
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Subject: Re: [quicwg/base-drafts] Moving text on spinbit into transport (#2364)
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ihlar commented on this pull request.

> @@ -2818,6 +2825,44 @@ encoded as a single byte with the value 0x01.  An endpoint MAY treat the receipt
 of a frame type that uses a longer encoding than necessary as a connection error
+## Latency Spin Bit {#spin-bit}
+The latency spin bit enables passive latency monitoring from observation points
+on the network path throughout the duration of a connection. The spin bit is
+only present in the short packet header, since it is possible to measure the
+initial RTT of a connection by observing the handshake. Therefore, the spin bit
+will appear after version negotiation and connection establishment are
+completed. On-path measurement and use of the Latency Spin Bit is further
+discussed in {{QUIC-MANAGEABILITY}}.
+The spin bit utilizes a single bit in the first byte of the short header. The
+location of the bit and procedures for how to set it by clients and servers are
+defined in {{short-header}}.
+Implementations MAY select to not implement the full spin bit functionality. In

Agree, that is a better phrasing

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