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Re: Reference set in HPACK

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Wed, 02 July 2014 06:36 UTC

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To: Roberto Peon <grmocg@gmail.com>
cc: Kazu Yamamoto <kazu@iij.ad.jp>, HTTP Working Group <ietf-http-wg@w3.org>
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From: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <20140702.143041.283993814131065692.kazu@iij.ad.jp> <CAP+FsNexzVzt+YV7oBeMdGrMoajbMVj1Z90XvQfaCuNMDjYdHg@mail.gmail.com> <20140702.145215.1023037072984695261.kazu@iij.ad.jp> <CAP+FsNc+xW1gKma0McrgXtPpwR0BCubHkvHhUbcHHyn1Sd6t0g@mail.gmail.com>
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Date: Wed, 02 Jul 2014 06:34:22 +0000
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Subject: Re: Reference set in HPACK
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In message <CAP+FsNc+xW1gKma0McrgXtPpwR0BCubHkvHhUbcHHyn1Sd6t0g@mail.gmail.com>, Roberto Peon writes:

>If the headers were regularized, with the use of a reference set, one could
>imagine a reduction of 20 bytes per header.
>With 100 elements, this is approximately 2k of data, or two packets worth.

You'd save as many if not more bytes by being able to transfer the
biggest of the 100 elements in DATA frames larger than 16383 bytes.

I think it is fair to ask for some credible real-world data that shows
reference sets making an actual difference that justifies the added
complexity.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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