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Fri, 17 Feb 2023 16:38:59 +0000 Date: Fri, 17 Feb 2023 16:38:53 +0000 From: Bruce Richardson <bruce.richardson@intel.com> To: Rajasekhar Pulluru <pullururajasekhar@gmail.com> CC: <stephen@networkplumber.org>, <dev@dpdk.org> Subject: Re: Multiple Tx-Queues not working as expected Message-ID: <Y++tnaP05hR09Dld@bricha3-MOBL.ger.corp.intel.com> References: <CAGA5_H7TO_ioqKkCpsZy=674yET=6O5K-AW9Jw0vijqB5HH24w@mail.gmail.com> <20230216115109.07067372@hermes.local> <CAGA5_H6kg-6tZozY5hKL8sFBJNrKGd2kTxAdDXitUGcHcFuA6w@mail.gmail.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <CAGA5_H6kg-6tZozY5hKL8sFBJNrKGd2kTxAdDXitUGcHcFuA6w@mail.gmail.com> X-ClientProxiedBy: LNXP265CA0052.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:5d::16) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|IA1PR11MB7869:EE_ X-MS-Office365-Filtering-Correlation-Id: 96a938f4-5a71-4544-58b9-08db11057821 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Dumping > HW counters don't report any drops in TX. > Is there a mechanism in DPDK to debug this? > Thanks & Regards, > Rajasekhar > Hi, so long as the packets are written successfully to the TX ring, they should be send out ok - unless the actual packets are some way invalid, e.g. undersized. Are the tx_burst calls reporting that all packets are getting written to the ring? All packets successfully written should be reported as received at the other end. In terms of the NIC TX stats, I'm not sure about for the ixgbe driver, but I think in some cases to get per-queue stats, you needed to set up a mapping of what queues you wanted to track stats for, as the NIC could only track a certain number of queues - fewer than that available in HW. See function [1]. For tracking transmits per queue, it's generally easier just to have the app track the successful enqueues to the ring. This is what testpmd does internally for queue stats, I believe (though for port stats it reads hardware). /Bruce [1] https://doc.dpdk.org/api/rte__ethdev_8h.html#a56fae7e398b289f795a1b6256149c4f3