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Fri, 10 Oct 2025 04:19:14 +0000 Message-ID: <3c428de8-f8a6-47a1-a5ca-768d1906ed24@intel.com> Date: Thu, 9 Oct 2025 21:19:13 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] x86/resctrl: Fix miscount of bandwidth event when reactivating previously Unavailable RMID To: Babu Moger , , , , , , , CC: , , , , , References: <8eace6e47bb7e124ffb6c10150d1b7d38c2f5494.1760034251.git.babu.moger@amd.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <8eace6e47bb7e124ffb6c10150d1b7d38c2f5494.1760034251.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR03CA0248.namprd03.prod.outlook.com (2603:10b6:a03:3a0::13) 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_|SA1PR11MB6614:EE_ X-MS-Office365-Filtering-Correlation-Id: f03c58eb-61d0-4620-11f5-08de07b42bdf 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|366016|376014|7416014; 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However, on AMD systems, only a limited number of RMIDs > are guaranteed to be actively tracked by the hardware. RMIDs that exceed > this limit are placed in an "Unavailable" state. When a bandwidth counter > is read for such an RMID, the hardware sets MSR_IA32_QM_CTR.Unavailable > (bit 62). When such an RMID starts being tracked again the hardware counter > is reset to zero. MSR_IA32_QM_CTR.Unavailable remains set on first read > after tracking re-starts and is clear on all subsequent reads as long as > the RMID is tracked. > > resctrl miscounts the bandwidth events after an RMID transitions from the > "Unavailable" state back to being tracked. This happens because when the > hardware starts counting again after resetting the counter to zero, resctrl > in turn compares the new count against the counter value stored from the > previous time the RMID was tracked. This results in resctrl computing an > event value that is either undercounting (when new counter is more than > stored counter) or a mistaken overflow (when new counter is less than Since there is going to be a respin ... there is a stray tab above. Reinette