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Wed, 3 Sep 2025 03:13:06 +0000 Message-ID: <58cde22c-21f4-4b82-8f64-495fefe522e3@intel.com> Date: Tue, 2 Sep 2025 20:13:03 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v17 32/33] x86/resctrl: Configure mbm_event mode if supported To: Babu Moger , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , References: From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0051.namprd03.prod.outlook.com (2603:10b6:303:8e::26) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|IA4PR11MB9131:EE_ X-MS-Office365-Filtering-Correlation-Id: 68a0ceca-597b-421d-fb6d-08ddea97cd98 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|1800799024|376014|7416014|366016|7053199007; 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On AMD platforms, it is > recommended to use the mbm_event mode, if supported, to prevent the > hardware from resetting counters between reads. This can result in > misleading values or display "Unavailable" if no counter is assigned > to the event. > > Enable mbm_event mode, known as ABMC (Assignable Bandwidth Monitoring > Counters) on AMD, by default if the system supports it. > > Update ABMC across all logical processors within the resctrl domain to > ensure proper functionality. > > Signed-off-by: Babu Moger > --- Reviewed-by: Reinette Chatre Reinette