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Wed, 17 Nov 2021 16:46:21 +0000 Message-ID: Date: Wed, 17 Nov 2021 08:46:16 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 Thunderbird/91.3.0 Subject: Re: [PATCH] selftests/resctrl: Skip MBM&CMT tests when Intel Sub-NUMA Content-Language: en-US To: "tan.shaopeng@fujitsu.com" , Fenghua Yu , Shuah Khan CC: "linux-kernel@vger.kernel.org" , "linux-kselftest@vger.kernel.org" References: <20211110082734.3184985-1-tan.shaopeng@jp.fujitsu.com> From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MWHPR10CA0006.namprd10.prod.outlook.com (2603:10b6:301::16) To BN0PR11MB5744.namprd11.prod.outlook.com (2603:10b6:408:166::16) MIME-Version: 1.0 Received: from [192.168.1.221] (71.238.111.198) by MWHPR10CA0006.namprd10.prod.outlook.com (2603:10b6:301::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4713.21 via Frontend Transport; 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It is not reasonable to disable the test for all systems > based on this hardware errata. > When I run restrl_test on Intel(R) Xeon(R) Gold 6254 CPU, > the result of CMT & MBM is "not ok", and I took some time to debug it. > In order to other people can do the test smoothly, I'd like to update the > patch to disable the test only on 2nd Generation Intel Xeon scalable processors. I've been thinking about this some more and I do not think that the test should be disabled. There is a clear incompatibility between SNC and RDT on these systems and I do not think the test should hide that, indeed it is helpful to highlight that there is an issue. Even so, spending time to debug a known issue is not a good use of time. Instead of skipping the test on these systems could the test perhaps be improved to provide more information on failure to help user decide if they really need SNC enabled? The test would show that RDT cannot be used on their system with the SNC configuration, hiding that information by skipping the test may create false idea that RDT is working with that configuration. Reinette