netdev - Re: [PATCH] TCP_FAILFAST: a new socket option to timeout/abort a connection quicker

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Date:	Thu, 26 Aug 2010 09:27:40 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Lars Eggert <lars.eggert@...ia.com>
Cc:	Jerry Chu <hkchu@...gle.com>,
	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	<ilpo.jarvinen@...sinki.fi>, <davem@...emloft.net>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH] TCP_FAILFAST: a new socket option to timeout/abort a  connection quicker


On Thu, 26 Aug 2010 09:01:31 +0300, Lars Eggert wrote:

Hi Jerry, Hi Lars

> USER_TIMEOUT is what is locally used for a connection (i.e., takes into
> account what the remote peer advertised and what we'd like to use),
while
> ADV_UTO is (only) what we'd like to use and are advertising.
> 
> (Yes, we initially thought we could make the mechanism simpler, but then
> we started to think through all the corner cases...)

o TCP_USER_TIMEOUT for the local timeout seems fine. This is consistent
with the literature and everybody knows how to interpret such a variable.

o TCP_ADV_UTO for the announced timeout. It correspond with the RFC and
inherent the word "advertise".

Jerry, for you the former is of interest, you can completely ignore my
on-top-functionality. I am satisfied with this!

Cheers, Hagen
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