Re: [Editorial Errata Reported] RFC7540 (4871)

Cory Benfield <cory@lukasa.co.uk> Wed, 30 November 2016 12:53 UTC

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From: Cory Benfield <cory@lukasa.co.uk>
In-Reply-To: <D373FD84-CDDE-4905-B093-F9C7A764BAC5@lukasa.co.uk>
Date: Wed, 30 Nov 2016 12:48:29 +0000
Cc: RFC Errata System <rfc-editor@rfc-editor.org>, Mike Belshe <mike@belshe.com>, fenix@google.com, Martin Thomson <martin.thomson@gmail.com>, ben@nostrum.com, alissa@cooperw.in, aamelnikov@fastmail.fm, Patrick McManus <pmcmanus@mozilla.com>, Mark Nottingham <mnot@mnot.net>, ietf-http-wg@w3.org
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References: <20161130043354.C786DB81319@rfc-editor.org> <1102C272-E8D6-40D3-9D39-7D4801ABD286@lukasa.co.uk> <CAGZNdJWPy6DCNd10iLctD0_Q9tgC99btNWL4bSutD=2B72KmXA@mail.gmail.com> <D373FD84-CDDE-4905-B093-F9C7A764BAC5@lukasa.co.uk>
To: Benedikt Christoph Wolters <benedikt.wolters@rwth-aachen.de>
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Subject: Re: [Editorial Errata Reported] RFC7540 (4871)
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> On 30 Nov 2016, at 12:42, Cory Benfield <cory@lukasa.co.uk> wrote:
> 
> 
>> On 30 Nov 2016, at 11:32, Benedikt Christoph Wolters <benedikt.wolters@rwth-aachen.de> wrote:
>> 
>> 2016-11-30 9:41 GMT+01:00 Cory Benfield <cory@lukasa.co.uk>uk>:
>>> What happens if both stream A and B are blocked? Should my server endeavour to serve dependent streams in that case? I *think* the answer is yes because of the logic around having grouping nodes formed from idle streams, but I’m not 100% sure and would like clarification.
>> 
>> Section 5.3.4 Prioritization State Management states:
>>> Resources are shared between streams with the same parent stream, which means that if a stream in that set closes or becomes blocked, any spare capacity allocated to a stream is distributed to the immediate neighbors of the stream.
>> 
>> In my understanding in your example A and B are blocked, C and D are
>> immediate neighbors of A so according to this they would get the
>> resources of A.
> 
> No, they aren’t immediate neighbours, they are immediate *children*. This is exactly the core question.

Oh, I apologise, I hadn’t realised that “neighbours” might be being applied in terms of its graph-theoretical definition. That’s an interesting point.