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

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Date:	Thu, 2 Oct 2008 21:16:32 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dâniel Fraga <fragabr@...il.com>
cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround
 (fwd)

On Thu, 2 Oct 2008, Dâniel Fraga wrote:

> On Thu, 2 Oct 2008 14:08:14 +0200 (CEST)
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > grmbl. tracer_enabled should have been ftrace_enabled of course.
> 
> 	Ok Thomas. I got a stall on my desktop.
> 
> 	It happens when I try to use sudo and it just stay stalled (I
> think trying to access /dev/log or something like that).
> 
> 	I got the trace here:
> 
> http://www.abusar.org/ftrace/trace.txt.bz2
> 
> 	after the stall.
> 
> 	Could you please check if there's something wrong?
> 
> 	I'd prefer if the stall happened in the server, but it still
> didn't happen. Anyway, it's the same problem.

Hmm, not sure. sudo is a different beast. All I can see in the trace
is that reiserfs is turning itself in circles (which is nothing new),
but there is nothing which might tell us about a stall. At the point
where you stopped the trace the relevant info was already replaced by
new stuff. It's a circular buffer which gets overwritten.

Thanks,

	tglx