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Thu, 19 Dec 2024 18:35:16 +0000 Message-ID: <808036fb-9a2c-44c3-ac6c-5406313a232a@intel.com> Date: Thu, 19 Dec 2024 10:35:14 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 0/2] selftests/resctrl: SNC kernel support discovery To: Maciej Wieczor-Retman , , 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: MW4PR04CA0185.namprd04.prod.outlook.com (2603:10b6:303:86::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_|DS0PR11MB6325:EE_ X-MS-Office365-Filtering-Correlation-Id: d6349385-4716-46e3-9d8f-08dd205be226 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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When enabled, NUMA-aware applications can > achieve better performance on bigger server platforms. > > SNC support was merged into the kernel [1]. With SNC enabled > and kernel support in place all the tests will function normally (aside > from effective cache size). There might be a problem when SNC is enabled > but the system is still using an older kernel version without SNC > support. Currently the only message displayed in that situation is a > guess that SNC might be enabled and is causing issues. That message also > is displayed whenever the test fails on an Intel platform. > > Add a mechanism to discover kernel support for SNC which will add more > meaning and certainty to the error message. > > Add runtime SNC mode detection and verify how reliable that information > is. > > Series was tested on Ice Lake server platforms with SNC disabled, SNC-2 > and SNC-4. The tests were also ran with and without kernel support for > SNC. > > Series applies cleanly on kselftest/next. > Could you please consider this series for inclusion? Thank you very much. Reinette