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Re: Size of window variables

From: Poul-Henning Kamp <phk@phk.freebsd.dk>
Date: Thu, 03 Jul 2014 18:59:57 +0000
To: Daniel Sommermann <dcsommer@fb.com>
cc: Martin Thomson <martin.thomson@gmail.com>, Greg Wilkins <gregw@intalio.com>, HTTP Working Group <ietf-http-wg@w3.org>
Message-ID: <18523.1404413997@critter.freebsd.dk>
In message <53B5A00F.9030705@fb.com>, Daniel Sommermann writes:

>6.9.1 has it:
>A sender MUST NOT allow a flow control window to exceed 2^31 - 1 bytes. 
>If a sender receives a WINDOW_UPDATE that causes a flow control window 
>to exceed this maximum it MUST terminate either the stream or the 
>connection, as appropriate.

I suggest we raise that limit to 2^63-1 bytes.

2^32 bytes only take a few seconds seconds at 100 Gbit, and files
larger than 2^32 are common as muck these days.

Raising the width of the window update itself is probably not needed,
as long as we squander the reserved bit on something else.

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.
Received on Thursday, 3 July 2014 19:00:20 UTC

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