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Fri, 5 Dec 2025 21:57:42 +0000 Message-ID: <99e33a39-f0ec-488b-88d9-634158aec6e1@intel.com> Date: Fri, 5 Dec 2025 13:57:41 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] x86/resctrl: Fix memory bandwidth counter width for Hygon To: Xiaochen Shen , "Luck, Tony" , "bp@alien8.de" , "fenghuay@nvidia.com" CC: "babu.moger@amd.com" , "james.morse@arm.com" , "Dave.Martin@arm.com" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" References: <20251204023750.994143-1-shenxiaochen@open-hieco.net> <20251204023750.994143-3-shenxiaochen@open-hieco.net> <03618cf2-b8c8-4493-a991-04bced42c7dd@open-hieco.net> Content-Language: en-US From: Reinette Chatre In-Reply-To: <03618cf2-b8c8-4493-a991-04bced42c7dd@open-hieco.net> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P222CA0021.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::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_|DS4PPF814058951:EE_ X-MS-Office365-Filtering-Correlation-Id: 892941a1-d8cf-42de-372b-08de344950d5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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You'd just need to keep polling fast enough >> (and we never adjusted the MBM polling rate from the original >> 1 HZ.) > > Thank you very much for code review! > > We have observed a test case where an incorrect counter width leads to random unexpected memory bandwidth readings: > https://github.com/shenxiaochen/my_documents/blob/main/memory_bandwidth_counter_width_and_overflow_issue_steps_to_reproduce.txt Could this perhaps be related to issue fixed by: 15292f1b4c55 ("x86/resctrl: Fix miscount of bandwidth event when reactivating previously unavailable RMID")? Reinette