Re: [quicwg/base-drafts] Add further guidance related to unidirectional stream TPs (#2612)

Jana Iyengar <> Wed, 17 April 2019 18:03 UTC

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From: Jana Iyengar <>
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Subject: Re: [quicwg/base-drafts] Add further guidance related to unidirectional stream TPs (#2612)
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janaiyengar approved this pull request.

A minor nit, but LGTM otherwise.

> @@ -321,8 +321,17 @@ defined in this document: control streams ({{control-streams}}) and push streams
 ({{push-streams}}).  Other stream types can be defined by extensions to HTTP/3;
 see {{extensions}} for more details.
-Both clients and servers SHOULD send a value of three or greater for the QUIC
-transport parameter `initial_max_uni_streams`.
+The performance of HTTP/3 connections in the early phase of their lifetime is
+sensitive to the creation and exchange of data on unidirectional streams.
+Endpoints that set low values for the QUIC transport parameters
+`initial_max_uni_streams` and `initial_max_stream_data_uni` will increase the
+chance that the remote peer reaches the limit early and becomes blocked. In
+particular, the value chosen for `initial_max_uni_streams` should consider that
+remote peers may wish to exercise reserved stream behaviour ({{stream-grease}}).
+To reduce the likelihood of blocking, both clients and servers SHOULD send a
+value of three or greater for the QUIC transport parameter
+`initial_max_uni_streams`, and a value of 1,024 or greater for the QUIC
+transport `initial_max_stream_data_uni`.

transport parameter `initial_max_stream_data_uni`.

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