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Wed, 8 Jan 2025 21:06:23 +0000 Message-ID: Date: Wed, 8 Jan 2025 13:06:20 -0800 User-Agent: Mozilla Thunderbird Subject: =?UTF-8?Q?Re=3A_=5BQuestion=5D_ixgbe=EF=BC=9AMechanism_of_RSS?= To: Haifeng Xu , Edward Cree , Eric Dumazet , Aleksandr Loktionov , "Kwapulinski, Piotr" CC: Przemek Kitszel , "David S. Miller" , Jakub Kicinski , Paolo Abeni , , , References: <87e945f6-2811-0ddb-1666-06accd126efb@gmail.com> <0d98fed8-38e3-4118-82c9-26cefeb5ee7a@shopee.com> <32775382-9079-4652-9cd5-ff0aa6b5fd9e@intel.com> <1ade15b1-f533-4cc6-8522-2d725532e251@shopee.com> Content-Language: en-US From: Tony Nguyen In-Reply-To: <1ade15b1-f533-4cc6-8522-2d725532e251@shopee.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR03CA0262.namprd03.prod.outlook.com (2603:10b6:a03:3a0::27) To BL3PR11MB6435.namprd11.prod.outlook.com (2603:10b6:208:3bb::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL3PR11MB6435:EE_|DM4PR11MB7758:EE_ X-MS-Office365-Filtering-Correlation-Id: 999a074a-28ab-4004-043a-08dd30284ec8 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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If it's off, I suspect it may be the Flow Director ATR (Application Targeting Routing) feature which will utilize all queues. I believe if you turn on ntuple filters this will turn that feature off. > > Yes, our ntuple filter setting is off. After turning on the ntuple filters, I compare the delta of recieved packets, > only 0~15 rx rings are non-zero, other rx rings are zero. > > If we want to spread the packets across 0~62, how can we tune the NIC setting? > we have enabled 63 rx queues, irq_affinity and rx-flow-hash, but the 0~15 cpu > received more packets than others. As Jakub mentioned earlier, HW RSS is only supported on this device for 16 queues. ATR will steer bi-directional traffic to utilize additional queues, however, once its exhausted it will fallback to RSS, which is why CPUs 0-15 are receiving more traffic than the others. I'm not aware of a way to evenly spread the traffic beyond the 16 HW supported RSS queues for this device. Thanks, Tony > Thanks!