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Date: Mon, 30 Nov 2009 19:50:04 +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 Sat, 28 Nov 2009 13:31:14 +0200 (EET), "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> a écrit : > I restored Ccs. Please keep them. Sorry, > On Sat, 28 Nov 2009, Frederic Leroy wrote: > > > Le Sat, 28 Nov 2009 00:12:23 +0200 (EET), > > "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> a écrit : > > > > > On Fri, 27 Nov 2009, Frederic Leroy wrote: > > > > > > > I put traces of stall here : > > > > http://www.starox.org/pub/scp_stall/ > [...] > Perhaps having the /proc/net/tcp would at least tell what state the > timer is (if I cannot reproduce right away). ...It is rather strange > that two independent mechanisms for loss recovery seem both to fail > to get triggered here, no traces of retransmission whatsoever. I > think it is for now enough to concentrate on what happens on > 192.168.1.15 (=houba?) and get tcpdump and proc/net/tcp from there, > the other end/direction has very little significance here (except for > the fact that bidirectionality might be needed to actually trigger > it). You could even think of getting proc/net/tcp a bit more often, > right from the start: > > while [ : ]; do grep ":0016" /proc/net/tcp; sleep 0.1; done | tee > scp_stall-houba.x.proc_net_tcp > > ...Please wait at least 2 minutes before hitting ctrl-c or otherwise > artificially intervening. You're right, 192.168.1.15 is houba. The faulty behaviour comes back today, I did new captures on 192.168.1.15 only : http://www.starox.org/pub/scp_stall/scp_stall-houba.2.pcap http://www.starox.org/pub/scp_stall/scp_stall-houba.2.proc_net_tcp http://www.starox.org/pub/scp_stall/scp_stall-houba.3.pcap http://www.starox.org/pub/scp_stall/scp_stall-houba.3.proc_net_tcp Which tool do you use to analyze /proc/net/tcp ? -- Frédéric Leroy -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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