Re: [Editorial Errata Reported] RFC7540 (4871)
Ryan Hamilton <rch@google.com> Wed, 30 November 2016 15:27 UTC
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From: Ryan Hamilton <rch@google.com>
Date: Wed, 30 Nov 2016 07:20:26 -0800
Message-ID: <CAJ_4DfQEYQr1OBepx1asM3BwJXHzmnLR089m2KwTtW-F5HPyEg@mail.gmail.com>
To: Stefan Eissing <stefan.eissing@greenbytes.de>
Cc: "tatsuhiro.t@gmail.com" <tatsuhiro.t@gmail.com>, Kazuho Oku <kazuhooku@gmail.com>, Cory Benfield <cory@lukasa.co.uk>, Martin Thomson <martin.thomson@gmail.com>, RFC Errata System <rfc-editor@rfc-editor.org>, Mike Belshe <mike@belshe.com>, Roberto Peon <fenix@google.com>, Ben Campbell <ben@nostrum.com>, Alissa Cooper <alissa@cooperw.in>, Alexey Melnikov <aamelnikov@fastmail.fm>, Patrick McManus <pmcmanus@mozilla.com>, Mark Nottingham <mnot@mnot.net>, HTTP Working Group <ietf-http-wg@w3.org>
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Subject: Re: [Editorial Errata Reported] RFC7540 (4871)
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I completely agree. Priority is all about sending the most important data first. Flow control is a distinct issue and mixing them together seems complex and confusing in ways that would limit the effectiveness of priority. On Wed, Nov 30, 2016 at 6:54 AM, Stefan Eissing < stefan.eissing@greenbytes.de> wrote: > A stream is blocked only by flow-control, as I read it. The errata would > suggest that the flow control of the parent would effectively rule those of > its descendants? That does not make much sense to me. > > This could easily become very messy. If flow control of dependant nodes > become entangled with their ancestors, then we basically have nested flow > control windows? Please. no. > > -Stefan > > > Am 30.11.2016 um 14:49 schrieb Tatsuhiro Tsujikawa < > tatsuhiro.t@gmail.com>: > > > > > > > > On Wed, Nov 30, 2016 at 10:29 PM, Kazuho Oku <kazuhooku@gmail.com> > wrote: > > 2016-11-30 22:05 GMT+09:00 Cory Benfield <cory@lukasa.co.uk>: > > > > > > > > > On 30 Nov 2016, at 13:04, Kazuho Oku <kazuhooku@gmail.com> wrote: > > > > > > My understanding is that you do not need to distinguish between > completed, idle and blocked states. > > > > > > For a stream under either of the three states, the weight associated > to the stream is distributed to the dependents. > > > > > > That is what nghttp2 does and H2O does (except for the fact that it > does not remember closed streams), and I this behavior is what is suggested > by the spec. > > > > > > > > > My understanding of what Martin is suggesting is that that isn’t true: > blocked streams do not distribute their weight to their dependants. > > > > > > Thank you for pointing that out. > > > > My understanding is that there is no special casing for blocked > > streams. Section 5.3.1 handles all the states we are discussing > > equally, quote: > > > > Inside the dependency tree, a dependent stream SHOULD only be > > allocated resources if either all of the streams that it depends on > > (the chain of parent streams up to 0x0) are closed or it is not > > possible to make progress on them. > > > > I also do not see why it would be beneficial to treat them differently. > > > > > > I agree with Kazuho. I think RFC 7540 is written based on the idea > that dependent stream can receive resource if the streams between it and > root are all either in closed, idle or blocked. > > > > Actually, from nghttp2 commit log, I made a commit which implemented the > proposed text. But we later reverted it, since there is no text in the > draft at that time to mandate that behaviour. > > > > Best regards, > > Tatsuhiro Tsujikawa > > > > > > > > > > > > However, that’s also what the Python Priority implementation does. > > > > > > Cory > > > > > > > > > > > -- > > Kazuho Oku > > > > > > >
- [Editorial Errata Reported] RFC7540 (4871) RFC Errata System
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Martin Thomson
- Re: [Editorial Errata Reported] RFC7540 (4871) Benedikt Christoph Wolters
- Re: [Editorial Errata Reported] RFC7540 (4871) Amos Jeffries
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Kazuho Oku
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Kazuho Oku
- Re: [Editorial Errata Reported] RFC7540 (4871) Benedikt Christoph Wolters
- Re: [Editorial Errata Reported] RFC7540 (4871) Cory Benfield
- Re: [Editorial Errata Reported] RFC7540 (4871) Tatsuhiro Tsujikawa
- Re: [Editorial Errata Reported] RFC7540 (4871) Stefan Eissing
- Re: [Editorial Errata Reported] RFC7540 (4871) Ryan Hamilton
- Re: [Editorial Errata Reported] RFC7540 (4871) laike9m
- RE: [Editorial Errata Reported] RFC7540 (4871) Mike Bishop
- Re: [Editorial Errata Reported] RFC7540 (4871) Martin Thomson
- Re: [Editorial Errata Reported] RFC7540 (4871) Kazuho Oku
- Re: [Editorial Errata Reported] RFC7540 (4871) Martin Thomson
- Re: [Editorial Errata Reported] RFC7540 (4871) Patrick McManus
- Re: [Editorial Errata Reported] RFC7540 (4871) Mark Nottingham
- Re: [Editorial Errata Reported] RFC7540 (4871) Martin Thomson
- Re: [Editorial Errata Reported] RFC7540 (4871) Mark Nottingham