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

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Message-ID: <20080921000231.7ab3c7aa@tux>
Date:	Sun, 21 Sep 2008 00:02:31 -0300
From:	Dâniel Fraga <fragabr@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>, thomas.jarosch@...ra2net.com,
	billfink@...dspring.com, Netdev <netdev@...r.kernel.org>,
	Patrick Hardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org, kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility
 workaround

On Fri, 19 Sep 2008 00:04:23 +0300 (EEST)
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> wrote:

> Anyway, if/when you succeed collecting some strace of the server 
> processes, please let me know (though putting a full one available might 
> not be wise thing like I said earlier). After I thought it a bit, it might 
> be enough the start the strace with -p for all server processes of a 
> service during a stall and then resolve it after some amount of waiting 
> with nmap (and hope that strace doesn't resolve it by interfering 
> something relevant :-), you will see that from the fact that it resolves 
> without nmap then). That would probably reveal if the processes where 
> waiting in accept() or not, and if not, where they were.

	I got a stall, tried to use strace but even strace couldn't
trace nothing. Everything which uses some kind of network connection is
stalled (or because everything is stalled, strace couldn't trace
anything).
	
	I'll try to leave strace running all the time, but I'm afraid
it could prevent the stall. Anyway, I'll test and return soon.


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