Re: [quicwg/base-drafts] Updated spinbit text (#2564)

Marcus Ihlar <> Tue, 09 April 2019 14:55 UTC

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Date: Tue, 09 Apr 2019 14:54:57 +0000
From: Marcus Ihlar <>
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Subject: Re: [quicwg/base-drafts] Updated spinbit text (#2564)
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ihlar commented on this pull request.

> +the spin bit on a randomly chosen fraction of connections. The random selection
+process SHOULD be designed such that on average the spin bit is disabled for at
+least one eighth of network paths. The selection process should be externally
+unpredictable but consistent for any given combination of source and destination
+address and port. The selection process performed at the beginning of the
+connection SHOULD be applied for all paths used by the connection.
+In case multiple connections share the same five-tuple, i.e. same source and
+destination IP address and UDP port the setting of the spin bit needs to be
+coordinated across all connections to ensure a clear signal to any on path
+measurement point, however that might not be feasible.
+When the spin bit is disabled, endpoints MAY set the spin bit to any value, and
+MUST accept any incoming value. It is RECOMMENDED that they set the spin bit to
+a random value either chosen independently for each packet, or chosen
+independently for each path and kept constant for that path.

Good point, what about:
"When the spin bit is disabled, endpoints MAY set the spin bit to any value, and MUST ignore any incoming value. It is RECOMMENDED that endpoints set the spin bit to a random value chosen independently for each path for a connection."

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