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RE: Unidirectional streams PR

"Lubashev, Igor" <ilubashe@akamai.com> Fri, 23 June 2017 05:08 UTC

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From: "Lubashev, Igor" <ilubashe@akamai.com>
To: Mike Bishop <Michael.Bishop@microsoft.com>, Martin Thomson <martin.thomson@gmail.com>, Ted Hardie <ted.ietf@gmail.com>
CC: Jana Iyengar <jri@google.com>, QUIC WG <quic@ietf.org>, Patrick McManus <pmcmanus@mozilla.com>
Subject: RE: Unidirectional streams PR
Thread-Topic: Unidirectional streams PR
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Date: Fri, 23 Jun 2017 05:08:46 +0000
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If you want to add information only to the initial STREAM frame without doubling the number of frames for STREAM, you have some options (each with a tradeoff).

1. As you said, initial STREAM frame (OO=0) can have an additional fixed field.

2. If you need to attach a single bit of information for the initial STREAM frame only occasionally, you can pay 1 byte when that bit of information is present.  (Use the fact that OO=0 and OO=01,Offset=0 are equivalent, so you can overload OO=01,Offset=0 with additional semantics.)  That bit can indicate "UNI" or it can indicate the presence of a fixed field after the Stream ID.



-----Original Message-----
From: Mike Bishop [mailto:Michael.Bishop@microsoft.com] 
Sent: Thursday, June 22, 2017 11:18 PM
To: Lubashev, Igor <ilubashe@akamai.com>; Martin Thomson <martin.thomson@gmail.com>; Ted Hardie <ted.ietf@gmail.com>
Cc: Jana Iyengar <jri@google.com>; QUIC WG <quic@ietf.org>; Patrick McManus <pmcmanus@mozilla.com>
Subject: RE: Unidirectional streams PR

Interesting design.  I was trying to avoid doubling the number of frames consumed by the STREAM frame by consuming just one.  But it's a good insight that offset is only absent on the first STREAM frame, so we could leverage that if we wanted to.  Maybe OO=0 indicates the presence of some fixed-size params, and one of those bits is directionality?

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