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Shenoy" , Swapnil Sapkal , Valentin Schneider , "regressions@lists.linux.dev" , "stable@vger.kernel.org" References: <4c0f13ab-c9cd-42c4-84bd-244365b450e2@amd.com> <996ca8cb-3ac8-4f1b-93f1-415f43922d7a@ateme.com> <3daac950-3656-4ec4-bbee-7a3bbad6d631@amd.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000FCC2:EE_|DS0PR12MB8788:EE_ X-MS-Office365-Filtering-Correlation-Id: fbce4191-9508-4995-ec9f-08dd8be7e1b1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?V05lSzhuaXFKWkpKVHgvTnhGUHV0YVhDYmV1STlZYy9aSFRYRkNxU3h6OFhq?= =?utf-8?B?Q1I0SEZRMWZNMXdmTnl5REVnM0JkQytQd1Z3WE1rYU1iMmQxV2EyUC9CTGFL?= =?utf-8?B?VnNBV1h5cVNNU3hMdGtRZG9SckxjbnYrd3BxSncraVVJWTE1a1p3UHR0OFg5?= =?utf-8?B?T0pPbWI5ckd2WmVGak1FbUtYZDl4N0hYYzV2VUpUbU9EQTZQY0x2Z1BQamp2?= =?utf-8?B?QlJmeGo0RXkxaVRIams0ekxhZEZNWGVaR25JYWJuajJKK3YvVlhaY3A2UWsv?= =?utf-8?B?eWtSKzZZRlRKZHN0RTNqV3JoWjJuRTl5THBTZmtmeFFBR0syK2dZcWZ2SjZu?= =?utf-8?B?V1Npb1BhaDlkb0xkaEpuek1MUUgxVWRqelFaSW5jT3cwR3RNa1FnQmxrMEts?= =?utf-8?B?YnpCcFhiL2ZxK2llSU9BalhLOTQvc3AyZG5xVFQ2Y1hNQnUvdWJvenZJUTJ2?= =?utf-8?B?djlQajVyUDVLTU9zS2h4Q1g3T3pudk8vZ3FzQVcrNmRmRlAvRWRPd0EySGFl?= =?utf-8?B?Z3pJN0hvUElWK1YyenkrVklXS1dOMHlHZmZab2t6T1VnaEV1Zit3cXc3R3U0?= =?utf-8?B?ZUF1WnQxSG9TNXdUWW0yT05qUmpMV2Q0UHZkSVlUMTh0U1E2VUJxWkJCYVZF?= =?utf-8?B?dnM5bXdqK0JnYTA2QW5qcUpqS08rYVZYaE1nNUZ1YlE1REZmcTk5c1hJdG9G?= =?utf-8?B?TkNzU1kyZGhmTWRWTVBDUXFrWjVpei9SYVRBaU9wT25mYW52KzVJTGQ5VjNI?= =?utf-8?B?WFFBR3UrMTRjcmt1OFE3Q2x1aWFjdHlObjZrY1JFTkx4QjFPRnhhc2xHYUIw?= =?utf-8?B?VWJ2T2poQ1JmSFBqdC9rNzBISWNCeENtNEprdG1lRmN5THZKOGs2cnNES3l1?= =?utf-8?B?MzJBVWo4bUpBdjVaRzhYRW5hWmNlUjZVeDZYUStvb0dzUWNkeWVOV1NlbnVh?= =?utf-8?B?L1c1a3ZtSFBCdmRGeCtKTU51amRLWllqZVhXRkNzeGI1dW9UelpPMGJzREdv?= =?utf-8?B?ZytkZkNEcm8ybTRoYzRnOFdRaGJxYVFkWW11M0U0VkE4S0dMSkFNdndvMlln?= =?utf-8?B?MSt5bDk4OUl5Tm5VUnVMMkFSelhqVlhOMnVDaGJrL05FcXd1anhJcnQydjFB?= =?utf-8?B?RFhwTEtRQ2ZTYWpjN21qS3lMOGNFSDNoMW9ldkFlSzhIQUlNUk9EdmJCTWhW?= =?utf-8?B?V042Y2RuWHNtOHZBRHpCKzk2cmV4RG1TMStRNFd4cVh1Y2JzZi9VVWt5S2lL?= =?utf-8?B?ekRGTktTNFBUNmxwTS9hVGpIZXhNM3ZVNVc3ajh5TlY2WFdtbm44UG1MczB5?= =?utf-8?B?ei9mZ2YvZkVpRTRpa09uR3RBbXBSS0Z1NWVvalZrMityT0hmR2pYeXYwUEZl?= =?utf-8?B?aXdXZXZmVUZxblNMclpid0FmdzhpL3lHc0VVekZxYUZ4bGc5bS9LeG1CelMv?= =?utf-8?B?QXZvMG5XUjdhMVFBZ1pLQi94ak1lSGE2N3RYT3dMVENiNkc1VGplSEovL1F1?= =?utf-8?B?WVhqc0FSSEhrZWJTczc1Y3FEZTVIUGdlRCtSeTdrZ2owRDcwS3VNYTk5ZG9L?= =?utf-8?B?YVozVnN3aFliY29VaW9zcmhLa3FSaXJ3R0RaZzFNYVcwb2h2ZkY0WTRwSGtG?= =?utf-8?B?WVFoTHNZK0pMZkd1dXBIWUlPTzZxcVVDaVh1NWFWV2gxNldWVWpzWHNDV0ZT?= =?utf-8?B?UmZ3RnhGcUZ3U2tZRmZINC9IaHdvNGxQT3JNYWlETjkwR0FWMHFKbldCdU81?= =?utf-8?B?OFhwc0thbEZNN0QzSzBybmFZUy9YNitqMTdiY0dCbWFneDI5aGpsUkFuWVM0?= =?utf-8?B?MDRHWWJ0cWk2aVltTy91aE1hR0pDYzJRc21xVXVrMWFzZXZOTm1WSnVpVFRD?= =?utf-8?B?anpTU3ljMDlnRVdFUmdkdWluKys4N2ZnVEwrVDJGL2krdG9TcmtKZ1RZVnBZ?= =?utf-8?B?VWRtay9tVlVMSTNaTEkxV3dKdXRjYkFHbVV4ZWpXMnJGWGlKZnRheEhGLy96?= =?utf-8?B?YndORTlpbXNWSnFQWDFEdGRoaHdJVEFScld5QzRxRkxHSzdTTTlwWnd4MXA0?= =?utf-8?Q?EfgUe3?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(7416014)(1800799024)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2025 15:16:59.5187 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fbce4191-9508-4995-ec9f-08dd8be7e1b1 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000FCC2.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8788 Hello Vincent, On 5/5/2025 8:40 PM, Vincent Guittot wrote: >>> commit 16b0a7a1a0af ("sched/fair: Ensure tasks spreading in LLC >>> during LB") eases the spread of task inside a LLC so It's not obvious >>> for me how it would increase "a lot of CPU migrations go out of CCX, >>> then L3 miss,". On the other hand, it will spread task in SMT and in >>> LLC which can prevent running at highest freq on some system but I >>> don't know if it's relevant for this SoC. >> >> I misspoke there. JB's workload seems to be sensitive even to core to >> core migrations - "relax_domain_level=2" actually disabled newidle >> balance above CLUSTER level which is a subset of MC on x86 and gets > > Did he try with relax_domain_level=3, i.e. prevent newilde idle > balance between LLC ? I don't see results showing that it's not enough > to prevent newly idle migration between LLC I don't think he did. JB if it isn't too much trouble, could you please try running with "relax_domain_level=3" in kernel cmdline and see if the performance is similar to "relax_domain_level=2". I only realized it later that "relax_domain_level" works on topology levels before degeneration. -- Thanks and Regards, Prateek