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Mon, 14 Apr 2025 17:30:20 +0000 Message-ID: <4bec8924-6125-45ef-a212-f123ab2e4f5b@intel.com> Date: Mon, 14 Apr 2025 10:30:18 -0700 User-Agent: Mozilla Thunderbird Subject: Re: Region aware RDT options for resctrl To: "Luck, Tony" , Fenghua Yu , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Anil Keshavamurthy 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: MW4PR04CA0172.namprd04.prod.outlook.com (2603:10b6:303:85::27) 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_|PH0PR11MB5015:EE_ X-MS-Office365-Filtering-Correlation-Id: b79e7ff0-ed19-449c-f8ec-08dd7b7a078d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|921020; 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On 4/11/25 1:56 PM, Luck, Tony wrote: > On Fri, Apr 11, 2025 at 01:54:12PM -0700, Luck, Tony wrote: > > Add Cc: lkml > >> A future CPU from Intel will implement "region aware" memory bandwidth >> monitoring and bandwidth allocation. This will provide for more granular >> monitoring and control for heterogeneous memory configurations. BIOS >> will populate an ACPI table that describes which system physical address >> ranges belong to each region. E.g. for a two socket system with both >> DDR and CXL memory regions could be assigned like this: >> >> Region 0: Local DDR >> Region 1: Remote DDR >> Region 2: Local CXL >> Region 3: Remote CXL If considering an assignment like above ... ... >> Option 1: Per-memory regions might be described individually like this: >> >> $ cat schemata >> RMB0:0=100;1=100 >> RMB1:0=75;1=75 >> RMB2:0=25;1=25 >> ... I assume "RMB0" represents "Region 0" and so forth. In this case, what do the "domain IDs" used in above option represent? Thank you. Reinette