Re: Design Issue: Separate HEADERS and PRIORITY Frames, Eliminate HEADERS+PRIORITY

Jeff Pinner <jpinner@twitter.com> Wed, 29 May 2013 01:26 UTC

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Date: Tue, 28 May 2013 18:25:30 -0700
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From: Jeff Pinner <jpinner@twitter.com>
To: Roberto Peon <grmocg@gmail.com>
Cc: =?UTF-8?B?V2lsbGlhbSBDaGFuICjpmYjmmbrmmIwp?= <willchan@chromium.org>, Martin Thomson <martin.thomson@gmail.com>, James M Snell <jasnell@gmail.com>, Patrick McManus <pmcmanus@mozilla.com>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
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Subject: Re: Design Issue: Separate HEADERS and PRIORITY Frames, Eliminate HEADERS+PRIORITY
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My preference for flag over opcode has to do with "one frame to open
streams" while I acknowledge the extra branch in the frame decoder --
though i think it might remove a branch in the session management code :)



On Tue, May 28, 2013 at 1:02 PM, Roberto Peon <grmocg@gmail.com> wrote:

> I think that the opcode approach is easier (I have a single branch instead
> of nested branches), but don't think it is a big deal either way.
>
> -=R
>
>
> On Tue, May 28, 2013 at 12:43 PM, William Chan (陈智昌) <
> willchan@chromium.org> wrote:
>
>> I have feelings about this bike shed color, but I don't care enough to
>> argue why mine is the best color ever. I am satisfied that there is a way
>> to convey priority within the same frame as the headers.
>>
>>
>> On Tue, May 28, 2013 at 11:12 AM, Jeff Pinner <jpinner@twitter.com>wrote;wrote:
>>
>>> At the time Roberto made the argument that the number of flags (8) was
>>> more sparse than the number of frame types (256), but IIRC this was based
>>> on the flags applying to all Control frames. At this point we have (at
>>> least implicitly) decided that flags are frame-type specific (see PONG
>>> flag), so I don't believe the argument is valid any more.
>>>
>>>
>>> On Tue, May 28, 2013 at 10:50 AM, Martin Thomson <
>>> martin.thomson@gmail.com> wrote:
>>>
>>>> I remember having almost this exact discussion in Tokyo.  The only
>>>> point that didn't come up this time was an argument Roberto made,
>>>> namely: "A frame type is cheaper (fewer bits) than a flag."
>>>>
>>>
>>>
>>
>