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Date:	Mon, 30 Nov 2009 23:19:39 +0100
From:	Frederic Leroy <fredo@...rox.org>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	Netdev <netdev@...r.kernel.org>, Asdo <asdo@...ftmail.org>
Subject: Re: scp stalls mysteriously

Le Mon, 30 Nov 2009 23:37:56 +0200 (EET),
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> a écrit :

> Ok. Just wanted to confirm since it can be that that not all packets
> are in the tcpdump that TCP was sending. For what reason is unknown
> at the moment. Any fancy firewall (iptables) rules on houba that
> could do such a trick here?

Nothing with netfilter or schedulers on houba, neither on sg ( no log
because no iproute installed ...)
http://www.starox.org/pub/scp_stall/houba.netfilter.log

> Also, have you changed sysctl settings from the defaults?

No but I could have change defaults in the linux config file.

I saved the current content of /proc/sys/net and proc/net : 
http://www.starox.org/pub/scp_stall/sg-proc_net-proc_sys_net.tbz2
http://www.starox.org/pub/scp_stall/houba-proc_net-proc_sys_net.tbz2

I put also linux config files in the directory.

> Could you try btw to disable frto (set tcp_frto sysctl to zero), in
> theory it could cause zero cwnd if something else is wrong too (I
> haven't yet read them all through so there might be other places
> where a zero cwnd can be set). Also I'm interested what happens if
> you disable timestamps, is the problem still reproducable.
 
Ok, I'll try these tomorrow when it will fault again :)

-- 
Frédéric Leroy
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