From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frederic Leroy Subject: Re: scp stalls mysteriously Date: Mon, 30 Nov 2009 19:50:04 +0100 Message-ID: <20091130195004.38dbc319@houba> References: <20091127223545.2a752429@houba> <20091128010156.1219012a@houba> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Netdev , Asdo To: "Ilpo =?UTF-8?B?SsOkcnZpbmVu?=" Return-path: Received: from sd-11162.dedibox.fr ([88.191.70.230]:34026 "EHLO sd-11162.dedibox.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752938AbZK3SuV convert rfc822-to-8bit (ORCPT ); Mon, 30 Nov 2009 13:50:21 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: Le Sat, 28 Nov 2009 13:31:14 +0200 (EET), "Ilpo J=C3=A4rvinen" a =C3=A9crit : > I restored Ccs. Please keep them. Sorry,=20 > On Sat, 28 Nov 2009, Frederic Leroy wrote: >=20 > > Le Sat, 28 Nov 2009 00:12:23 +0200 (EET), > > "Ilpo J=C3=A4rvinen" a =C3=A9crit : > >=20 > > > On Fri, 27 Nov 2009, Frederic Leroy wrote: > > >=20 > > > > I put traces of stall here :=20 > > > > 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 (=3Dhouba?) 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: >=20 > while [ : ]; do grep ":0016" /proc/net/tcp; sleep 0.1; done | tee > scp_stall-houba.x.proc_net_tcp >=20 > ...Please wait at least 2 minutes before hitting ctrl-c or otherwise=20 > 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 :=20 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 ? --=20 =46r=C3=A9d=C3=A9ric Leroy