netdev - Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

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Message-Id: <200808131000.29788.thomas.jarosch@intra2net.com>
Date:	Wed, 13 Aug 2008 10:00:28 +0200
From:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
To:	David Miller <davem@...emloft.net>
Cc:	ilpo.jarvinen@...sinki.fi, billfink@...dspring.com,
	fragabr@...il.com, netdev@...r.kernel.org, kaber@...sh.net,
	sr@...urenet.de, netfilter-devel@...r.kernel.org,
	kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

On Tuesday, 12. August 2008 10:18:22 David Miller wrote:
> From: Thomas Jarosch <thomas.jarosch@...ra2net.com>
> Date: Tue, 12 Aug 2008 09:46:17 +0200
>
> > David, I agree with you, though I'm not sure about the end user
> > experience:
>
> We had the same situation with ECN and window scaling, and my proposal
> is the same as how we handled those situations involving broken
> middleware boxes.

Yes, that is true. IMHO there's a slight difference with FRTO trouble
compared to ECN/window scaling issues:

ECN trouble -> No access at all
Broken window scaling -> Large transfers don't work
MTU issues -> No access at all / large transfers don't work

FRTO problems -> Hard to spot as they only happen when packet loss occurs.
Though I guess Ilpo knows best if there's an "easy" way to detect this or not.

Thomas
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