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

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Message-ID: <Pine.LNX.4.64.0808122044450.16105@wrl-59.cs.helsinki.fi>
Date:	Tue, 12 Aug 2008 20:52:37 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	"Dâniel Fraga" <fragabr@...il.com>
cc:	David Miller <davem@...emloft.net>, thomas.jarosch@...ra2net.com,
	billfink@...dspring.com, Netdev <netdev@...r.kernel.org>,
	Patrick Hardy <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 Tue, 12 Aug 2008, Dâniel Fraga wrote:

> On Tue, 12 Aug 2008 01:18:22 -0700 (PDT)
> David Miller <davem@...emloft.net> wrote:
> 
> > 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.
> 
> 	Sorry for my ignorance (I'm just an user), but if the problem
> is not with Linux, why this problem appeared just on 2.6.25 kernel? I
> mean, with 2.6.24 and before I never had stalled connections. Just a
> coincidence? Or something has changed in 2.6.25 which caused this?

I still propose that you tcpdump it, then I can tell you (I know
enough about Thomas' case but yours has a large number of
unknowns)... :-) I don't know why 2.6.24 didn't suffer from the
problem as FRTO was enabled already in it. The command you need
to create dump.log file:

# tcpdump -w dump.log -i <iface> host <peerip>

...you need root rights (or sudo) to do the capturing.


-- 
 i.