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Wed, 2 Dec 2020 15:47:51 +0000 Subject: Re: rx-dropped increases if the can module is not loaded (yet) To: Oliver Hartkopp , "linux-can@vger.kernel.org" References: <269cc265-272e-6b57-0f95-90a3bd66aea3@victronenergy.com> <438db92e-692a-5fcf-db97-7ba3a51c97be@hartkopp.net> From: Jeroen Hofstee Message-ID: Date: Wed, 2 Dec 2020 16:47:50 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <438db92e-692a-5fcf-db97-7ba3a51c97be@hartkopp.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [2001:1c01:3bc5:4e00:e791:efe6:bf00:7133] X-ClientProxiedBy: AM4PR0701CA0013.eurprd07.prod.outlook.com (2603:10a6:200:42::23) To DBAPR07MB6967.eurprd07.prod.outlook.com (2603:10a6:10:192::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2001:1c01:3bc5:4e00:e791:efe6:bf00:7133] (2001:1c01:3bc5:4e00:e791:efe6:bf00:7133) by AM4PR0701CA0013.eurprd07.prod.outlook.com (2603:10a6:200:42::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.9 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?MGIxeXF1SjhRSEtjYkd6VWh6VWQzeG5tZ1p2dlBzclo4ejVnUFdXU0pSUElE?= =?utf-8?B?UlRDd3JvOG4yYVRPMDVhbU5nSE80cGRxcVp1cHZzaFY4RHVOUmNkTkJoVEtk?= =?utf-8?B?VmpWc29wQ2hMcFpkQ1JmLzNkczRYQ08xT2lGZkNCckdhRnNwYmdVN2tBVUVX?= =?utf-8?B?YVVPU3lwTlNxMUp4WWZDcHpBdGc3UGEvVThkZzF5c2RITDgxdDZsRjMxK1cr?= =?utf-8?B?U2dFNmd0NktwZWpmbzFFUjdDWE1TTnBCZWlIUFhnQjNBZ3pMSTQ1d0Z3WjJW?= =?utf-8?B?d1JINTc1SFNhaFpNQUVyL3lJRHJqYlVRV1cvRkt5WDJ3UzZGRDRRTVZ4NkNZ?= =?utf-8?B?SnBkVmx6VzJWbWdRbW5pUkRYZkUxZEpaTS9SbmtubGhTai9HdXZsVE9kZTdj?= =?utf-8?B?eDVaRnFtb2RLSzVOczM4a2dGY1pQZDU5SHg4RDJwNVBtZ3h6b0xkK1grYVMv?= =?utf-8?B?KzdFbEl2YmZ0ak8wcWtJM0tBRnNLOVVqSTFIOTFlTUhzMmVFaklYWGVrUml2?= =?utf-8?B?dHljYnJCNmtySzFwcGVDYVdYNHhvbTFOZUhFSnBLR1dCZlNSZDBuKzNQMXhx?= =?utf-8?B?dW5tU3Fwc1Q5OWZkUGl2d1c2UHd2Ry9GakpBTGVBaWxSMFczN3RCaFFTeENK?= =?utf-8?B?anlEeENYOHlRN1ZqeXNpakVYY1R4QlptMUFBRDRhRnBZTXl4bVJrZjQrQWFV?= =?utf-8?B?bkRFd2F5K1FBQzdjTkdqTTVrU3JFQ3Vzb1ZUd1BmZVo0dUVxYlF3ZUtudkVV?= =?utf-8?B?VEVZTlNNQ3RMdmlMSTV2bnY0ekE3YlRIWXVxT2pIcURwVlREZkR0SFBCQTE3?= =?utf-8?B?R2dRWkVqTEFhcGE0SnZQTE0xdy9XaFpWUTcvemR5R2dUdDlVWjNwLytEY3oz?= =?utf-8?B?L2lBZTRQem13cVZoTnBhbFBPV2hIbEJnbXU3K1NKUzc2YVIyNGxTN2ZqTWJr?= =?utf-8?B?WFU5V0MzKzR4ODFSMDFQV1FIb0d3QnB2d3JxRjFGUVV6Ynd2dkVCbURYRmk4?= =?utf-8?B?dXZaNWJlWDcxazh4aWhoOG5CN2hrQUltdWZhYUVjNFpBRnJkYXVlZEI4L2pZ?= =?utf-8?B?RVpiSWdXYkVvM0o3NjZZNEZJbjVwbWtmKzVaN0djK1VETmVKWStxWkw5SElo?= =?utf-8?B?TzJDb3B3dExMNEVEa1lwdmVyNnIzdnBzRTVaUC9OUCtIR3dWZnpxcmRwWmtw?= =?utf-8?B?MSttUUc4eHhlNUNMSjFPNk1Kc1htbXB1WkZEandGQStMRnFuK1Z1cXgyNXNu?= =?utf-8?B?V3J4QXNncW8vY0JrUFpNTGhOWnQ0YXVkbmxtRjh2bXFvdEd6akZVSU9EOU5q?= =?utf-8?B?N2pqZXVCNUJrUVA3cnltR2VmZXNRZGJKLzYzekJzNFdGRWJvYUFXaUN0bHJD?= =?utf-8?B?dVprTDRHaGRXdnloZmVXTlNWSkhrRC96OFcvaVNpbXVLU2VQTDdPcFdNMjJB?= =?utf-8?Q?XEEjCKjP?= X-OriginatorOrg: victronenergy.com X-MS-Exchange-CrossTenant-AuthSource: DBAPR07MB6967.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Dec 2020 15:47:51.5056 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 60b95f08-3558-4e94-b0f8-d690c498e225 X-MS-Exchange-CrossTenant-Network-Message-Id: debda649-7749-4df6-a567-08d896d9a067 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: beQPaipLIcOnfGWI2Y4dapj+x8QDFvmSCKJ5ZVVRrpofund14lQnOTfuNKxZ1MTFQjOZDLGbq9t7w9MW0Z/7bJZ3t+lugF0zrxt7JBk/Jbw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBAPR07MB6854 Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org Hello Oliver, On 11/28/20 6:44 PM, Oliver Hartkopp wrote: > On 27.11.20 17:09, Jeroen Hofstee wrote: > >> Since it took me a while to figure it out, it might be worthwhile to >> share. >> If a CAN-bus network interface is first set to up and only later used, >> the messages received in the meantime are counted by [1] as dropped. > > Interesting! But makes sense and is consistent: When the CAN frame is > not processed by the network layer is is just dropped in the rx path. > >> If the the can module is modprobed before the interface is upped, this >> is no longer the case. >> >> Perhaps it saves someone some time. > > So far we have not documented these details for the existing netdev > statistics. Do you think this is needed when the behaviour, which > leads to rx-dropped, is common for other netdevs also? > > Don't know... Perhaps we should simply wait and see how many people show up wondering where the rx-dropped frames are coming from? Regards, Jeroen