From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Hartkopp Subject: Re: Need help in interpreting ip status output Date: Sat, 21 Mar 2020 18:04:35 +0100 Message-ID: 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: 8bit Return-path: Received: from mo4-p00-ob.smtp.rzone.de ([81.169.146.217]:17569 "EHLO mo4-p00-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727033AbgCUREh (ORCPT ); Sat, 21 Mar 2020 13:04:37 -0400 In-Reply-To: <75a1a6b5-141e-e741-f6c2-bab5e9e4e541@gmx.de> Content-Language: en-US Sender: linux-can-owner@vger.kernel.org List-ID: To: =?UTF-8?Q?Andr=c3=a9_Hartmann?= , "linux-can@vger.kernel.org" , Alex Blasche , Marc Kleine-Budde + Marc Hi André, On 21/03/2020 16.19, André Hartmann wrote: >> On 12/03/2020 18.43, André 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 been >> 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/drivers/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