netdev - Re: scp stalls mysteriously

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Message-ID: <20091203202328.62d7551a@houba>
Date:	Thu, 3 Dec 2009 20:23:28 +0100
From:	Frederic Leroy <fredo@...rox.org>
To:	Damian Lukowski <damian@....rwth-aachen.de>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Greg KH <gregkh@...e.de>
Subject: Re: scp stalls mysteriously

Le Thu, 03 Dec 2009 15:10:11 +0100,
Damian Lukowski <damian@....rwth-aachen.de> a écrit :
> > I suppose adding || !tp->retrans_stamp into the false condition is
> > fine as long as we don't then have a connection that can cause a
> > connection to hang there forever for some reason (this needs to be
> > understood well enough, not just test driven in stables :-)).
> > 
> >> Unluckily, I still cannot reproduce the scp stalls here, so it
> >> would be nice if Frederic printed retrans_stamp together with
> >> icsk_ca_state and icsk_retransmits, please.
> > 
> > It wouldn't hurt to know tp->packets_out and tp->retrans_out too,
> > that might have some significant w.r.t what happens because of FRTO.
> 
> I made a patch for Frederic with Codebase
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> 
> Thanks for testing.

I made a new .11 trace with damian patch.
The copy went to the end. 

http://www.starox.org/pub/scp_stall/scp_stall-houba.11-patch_damian.pcap.bz2
http://www.starox.org/pub/scp_stall/scp_stall-houba.11-patch_damian.dmesg.bz2
http://www.starox.org/pub/scp_stall/scp_stall-houba.11-patch_damian.proc_net_netstat-before.bz2
http://www.starox.org/pub/scp_stall/scp_stall-houba.11-patch_damian.proc_net_netstat-after.bz2
http://www.starox.org/pub/scp_stall/scp_stall-houba.11-patch_damian.sysctl_net.ipv4.tcp-before.bz2

-- 
Frédéric Leroy
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