From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frederic Leroy Subject: Re: scp stalls mysteriously Date: Thu, 3 Dec 2009 23:03:39 +0100 Message-ID: <20091203230339.56a613e1@houba> References: <20091130213727.2f4047d2@houba> <20091201211945.505d3c98@houba> <20091202085925.472136e2@houba> <20091202154403.GB30730@sd-11162.dedibox.fr> <20091202183451.173db5f2@houba> <4B16BD58.3040802@tvk.rwth-aachen.de> <20091203085933.GD30730@sd-11162.dedibox.fr> <4B17A791.80808@tvk.rwth-aachen.de> <4B17C6C3.1060000@tvk.rwth-aachen.de> <20091203202328.62d7551a@houba> <4B1820B8.7050500@tvk.rwth-aachen.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Ilpo =?UTF-8?B?SsOkcnZpbmVu?= , Netdev , David Miller , Eric Dumazet , Herbert Xu , Greg KH To: Damian Lukowski Return-path: Received: from sd-11162.dedibox.fr ([88.191.70.230]:49074 "EHLO sd-11162.dedibox.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752041AbZLCWD5 convert rfc822-to-8bit (ORCPT ); Thu, 3 Dec 2009 17:03:57 -0500 In-Reply-To: <4B1820B8.7050500@tvk.rwth-aachen.de> Sender: netdev-owner@vger.kernel.org List-ID: Le Thu, 03 Dec 2009 21:34:00 +0100, Damian Lukowski a =C3=A9crit : > Frederic Leroy schrieb: > > Le Thu, 03 Dec 2009 15:10:11 +0100, > > Damian Lukowski a =C3=A9crit : > >>> I suppose adding || !tp->retrans_stamp into the false condition i= s > >>> 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 b= e > >>> 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.g= it > >> > >> Thanks for testing. > >=20 > > I made a new .11 trace with damian patch. > > The copy went to the end.=20 >=20 > Ok, at least this "fix" seems to work at first glance, but the printk > is quite useless now. Could you run another test with the printk's bu= t > without the retrans_stamp =3D=3D 0 check, please? Done, it's .13 It stalled. I only manage to make a failing stream only once. It seems after 23h the network is not interferenced. --=20 =46r=C3=A9d=C3=A9ric Leroy