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Mon, 16 Dec 2024 21:43:16 +0000 Message-ID: <6c540c6d-680d-4a22-bec9-e4184bff051f@intel.com> Date: Mon, 16 Dec 2024 13:43:15 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 1/2] selftests/resctrl: Adjust effective L3 cache size with SNC enabled To: Maciej Wieczor-Retman , , CC: , , , References: <83dcba6a462ec010a3c80bd8c6d66f49502b75ae.1734361935.git.maciej.wieczor-retman@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <83dcba6a462ec010a3c80bd8c6d66f49502b75ae.1734361935.git.maciej.wieczor-retman@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0125.namprd03.prod.outlook.com (2603:10b6:303:8c::10) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|PH7PR11MB6651:EE_ X-MS-Office365-Filtering-Correlation-Id: 7e323ed7-53c4-4726-0e66-08dd1e1aa652 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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Systems may support splitting into either two, three, four or six > nodes. When SNC mode is enabled the effective amount of L3 cache > available for allocation is divided by the number of nodes per L3. > > It's possible to detect which SNC mode is active by comparing the number > of CPUs that share a cache with CPU0, with the number of CPUs on node0. > > Detect SNC mode once and let other tests inherit that information. > > Update CFLAGS after including lib.mk in the Makefile so that fallthrough > macro can be used. > > To check if SNC detection is reliable one can check the > /sys/devices/system/cpu/offline file. If it's empty, it means all cores > are operational and the ratio should be calculated correctly. If it has > any contents, it means the detected SNC mode can't be trusted and should > be disabled. > > Check if detection was not reliable due to offline cpus. If it was skip > running tests since the results couldn't be trusted. > > Co-developed-by: Tony Luck > Signed-off-by: Tony Luck > Signed-off-by: Maciej Wieczor-Retman > --- Thank you very much. Reviewed-by: Reinette Chatre Reinette