From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Andr=c3=a9_Hartmann?= Subject: Re: Need help in interpreting ip status output Date: Mon, 23 Mar 2020 08:19:09 +0100 Message-ID: <42667b7b-59be-051b-eeca-da5b5b843221@gmx.de> References: <86b34b1b-7bda-e481-2087-1be8e64d2fed@hartkopp.net> <75a1a6b5-141e-e741-f6c2-bab5e9e4e541@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Return-path: Received: from mout.gmx.net ([212.227.15.15]:41471 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727380AbgCWHTP (ORCPT ); Mon, 23 Mar 2020 03:19:15 -0400 In-Reply-To: Content-Language: en-GB Sender: linux-can-owner@vger.kernel.org List-ID: To: Oliver Hartkopp , "linux-can@vger.kernel.org" , Alex Blasche , Marc Kleine-Budde Thanks Oliver. Reading the log it indeed seems a good idea to try a newer Kernel. Marc, do you have any further comments? Thanks and best regards, Andr=C3=A9 On 21.03.20 18:04, Oliver Hartkopp wrote: > + Marc > > Hi Andr=C3=A9, > > On 21/03/2020 16.19, Andr=C3=A9 Hartmann wrote: > >>> On 12/03/2020 18.43, Andr=C3=A9 Hartmann wrote: >>> >>>>> can someone help me interpreting the following ip output: > >>> The reason for the overrun error is a notification from the CAN >>> controller itself. It tells us that the received CAN frame has not bee= n >>> read from the controller until the next CAN frame arrived. >> >> Ok, that's what I thought too, thanks for the confirmation. >> >>> The dropped counter usually indicates that the CAN driver did not get = a >>> skbuff data structure (e.g. out of memory condition). >>> >>> This is NOT good. What CAN hardware/setup are you using? >> >> Actually it's not my system. The report is from a customer doing a full >> load test on an iMX8: https://bugreports.qt.io/browse/QTBUG-82610 > > Thanks for the link! > >> I guess the customer should try a more recent Kernel than 4.14 first? > > The FlexCAN driver (which is used in the IMX8 AFAIK) had a remarkable > number of changes last year: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/d= rivers/net/can/flexcan.c > > > So I would definitely suggest an update. > I added Marc to this thread as he was very active on the FlexCAN > improvements. > > Best, > Oliver