From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Grandegger Subject: Re: [Socketcan-users] Message stalls in SocketCan Layer? Date: Fri, 03 Feb 2012 20:41:56 +0100 Message-ID: <4F2C3884.2000808@grandegger.com> References: <4F29091F.4010908@in.tum.de> <4F2AA5DF.9080304@grandegger.com> <4F2C0675.1050808@in.tum.de> <4F2C11DF.7010707@hartkopp.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from ngcobalt02.manitu.net ([217.11.48.102]:47508 "EHLO ngcobalt02.manitu.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753372Ab2BCTl7 (ORCPT ); Fri, 3 Feb 2012 14:41:59 -0500 In-Reply-To: <4F2C11DF.7010707@hartkopp.net> Sender: linux-can-owner@vger.kernel.org List-ID: To: Oliver Hartkopp Cc: =?ISO-8859-1?Q?Michael_J=E4ntsch?= , linux-can@vger.kernel.org On 02/03/2012 05:57 PM, Oliver Hartkopp wrote: > Hi Michael, >=20 > On 03.02.2012 17:08, Michael J=E4ntsch wrote: >=20 >=20 >> yes, it all started when I switched to kernel 3.0.0-15-generic. Howe= ver, >> weirdly enough there is one computer with this kernel where the prob= lem >> doesn't appear and two where it does. I think I will confirm this by >> going back to an older kernel and seeing if the problem disappears. >=20 >=20 > please consider that if it works on other machines with the same kern= el that > there could be some changes within the USB subsystem or some interrup= t or > ACPI/powersaving issues too. >=20 > Going back to an older Kernel is a good check - don't know, if you al= so can go > further (3.1, 3.2) with Ubuntu 11.10 too ?!? >=20 > Maybe there's some USB debugging available to check whether the URB h= as been > sent properly to the USB wire and if the interrupt of the USB control= ler > reached the system after sending. IIUC, he said that the time stamps indicated that the USB transfers hav= e happened in time. The delays occured later. That's wired, indeed. Wolfgang.