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

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Message-ID: <cb32d2a8676d5447e04882302228c4b6@localhost>
Date:	Wed, 25 Aug 2010 10:21:39 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Jerry Chu <hkchu@...gle.com>
Cc:	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 Tue, 24 Aug 2010 15:13:44 -0700, Jerry Chu <hkchu@...gle.com> wrote:
> On Tue, Aug 24, 2010 at 9:28 AM, Hagen Paul Pfeifer <hagen@...u.net>
wrote:

> So it looks like the user timeout can be used in either senario
(shortening
> or lengthening) and in both cases is a lower bound, i.e., the connection
> should abort at or shortly after the specified user timeout.
>
> In this case does it make sense to combine the two? Will your TCP_UTO
> patch be ready anytime soon?
> 
> Again an alternative is to allow configuring tcp_retries2 and
TCP_RTO_MAX
> directly. I'm open to suggestion but we'd like to get something in
sooner.

Hello Chu! My Idea: you provide functionality to modify the user timeout.
The interface should be generic enough to allow small as well as large - up
to 22 days - values. This interface should be sufficient for you and later
for me. Afterwards I provide an patch which apply on your groundwork. My
patch handle TCP UTO specific functionality like TCP option protocol
handling functionality, socket option, permissions, lower- and upper
bounds, ...

Did you check interactions with other TCP timers like keep-alive timer? 

Today in the evening I will focus on TCP Quick ACK modifications. After
that I am in the Alps for vacation for 5 days. Later on I will work on the
patch (the patch is in a good state, modification and testing should
consume only 2 evenings - hopefully ;-).

Cherry, is this ok for you?

Hagen
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