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Tue, 25 Jun 2024 23:35:19 +0000 Message-ID: <23d982d2-97c5-4f2f-a034-858bec34bef7@intel.com> Date: Tue, 25 Jun 2024 16:35:17 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v21 16/18] x86/resctrl: Enable shared RMID mode on Sub-NUMA Cluster (SNC) systems To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin CC: , , References: <20240621223859.43471-1-tony.luck@intel.com> <20240621223859.43471-17-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20240621223859.43471-17-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0256.namprd03.prod.outlook.com (2603:10b6:303:b4::21) 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_|CO1PR11MB4929:EE_ X-MS-Office365-Filtering-Correlation-Id: 489dde7c-30af-4372-9ab1-08dc956f7971 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230038|366014|376012|1800799022; 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The default > mode divides RMID counters between SNC nodes. E.g. with 200 RMIDs and > two SNC nodes per L3 cache RMIDs 0..99 are used on node 0, and 100..199 > on node 1. This isn't compatible with Linux resctrl usage. On this > example system a process using RMID 5 would only update monitor counters > while running on SNC node 0. > > The other mode is "RMID Sharing Mode". This is enabled by clearing bit > 0 of the RMID_SNC_CONFIG (0xCA0) model specific register. In this mode > the number of logical RMIDs is the number of physical RMIDs (from CPUID > leaf 0xF) divided by the number of SNC nodes per L3 cache instance. A > process can use the same RMID across different SNC nodes. > > See the "Intel Resource Director Technology Architecture Specification" > for additional details. > > When SNC is enabled, update the MSR when a monitor domain is marked > online. Technically this is overkill. It only needs to be done once > per L3 cache instance rather than per SNC domain. But there is no harm > in doing it more than once, and this is not in a critical path. > > Signed-off-by: Tony Luck > --- Reviewed-by: Reinette Chatre Reinette