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Re: Straw Poll: Restore Header Table and Static Table Indices

"Poul-Henning Kamp" <phk@phk.freebsd.dk> Tue, 21 October 2014 09:37 UTC

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To: Willy Tarreau <w@1wt.eu>
cc: Roberto Peon <grmocg@gmail.com>, Mark Nottingham <mnot@mnot.net>, RUELLAN Herve <Herve.Ruellan@crf.canon.fr>, Amos Jeffries <squid3@treenet.co.nz>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
In-reply-to: <20141021092505.GA30397@1wt.eu>
From: Poul-Henning Kamp <phk@phk.freebsd.dk>
References: <CAH_y2NHhDTDtM4+DvWAf66GiO7of4H+ouMhxzseGODhfCSchXg@mail.gmail.com> <CAHzwyDuuN=-DyGiWAfttwq7O_zUGOE=7kVf5J=qu6i_-A9ezfg@mail.gmail.com> <543E0400.8080009@treenet.co.nz> <20141015201540.GB980@1wt.eu> <6C71876BDCCD01488E70A2399529D5E53BF5F842@ADELE.crf.canon.fr> <20141016091626.GC3079@1wt.eu> <34008D72-5800-412E-A276-81C6C7BFA9E2@mnot.net> <20141020165353.GA25743@1wt.eu> <8F120E2F-704E-44CB-ACF2-C743B870B2B6@mnot.net> <CAP+FsNdOHVj=YTE35Vj7mbED0OKghd-mpnFZSMcZNBM3JybJDg@mail.gmail.com> <20141021092505.GA30397@1wt.eu>
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Date: Tue, 21 Oct 2014 09:32:55 +0000
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Subject: Re: Straw Poll: Restore Header Table and Static Table Indices
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--------
In message <20141021092505.GA30397@1wt.eu>, Willy Tarreau writes:

>I would guess they should appear in the order above, though that's not
>obvious to me. And I'm still sad at the idea of leaving many encoding
>values unused (eg: static header values above 16). Thus, we'll typically
>have 48 possible values out of 256 for the first byte that will never be
>emitted just for the indexed headers alone, that's a 20% waste, 

If you are that worried about wasted compression opportunities, you
should spend your time to get timestamps compressed to integers since
that will save more bytes than you can ever do by tweaking the current
HPACK in any way.

-- 
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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