From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frederic Leroy Subject: Re: scp stalls mysteriously Date: Mon, 30 Nov 2009 23:19:39 +0100 Message-ID: <20091130231939.715491b4@houba> References: <20091127223545.2a752429@houba> <20091128010156.1219012a@houba> <20091130195004.38dbc319@houba> <20091130213727.2f4047d2@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]:48404 "EHLO sd-11162.dedibox.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753415AbZK3WTz convert rfc822-to-8bit (ORCPT ); Mon, 30 Nov 2009 17:19:55 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: Le Mon, 30 Nov 2009 23:37:56 +0200 (EET), "Ilpo J=C3=A4rvinen" a =C3=A9crit : > 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 :=20 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. =20 Ok, I'll try these tomorrow when it will fault again :) --=20 =46r=C3=A9d=C3=A9ric Leroy