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CH2PR12MB4231.namprd12.prod.outlook.com (2603:10b6:610:7d::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7784.19; Thu, 18 Jul 2024 09:02:38 +0000 Received: from IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134]) by IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134%3]) with mapi id 15.20.7784.017; Thu, 18 Jul 2024 09:02:37 +0000 Message-ID: <03f2114b-4feb-4387-981f-163d877034b2@amd.com> Date: Thu, 18 Jul 2024 14:32:28 +0530 User-Agent: Mozilla Thunderbird Subject: Re: Hard and soft lockups with FIO and LTP runs on a large system To: Hillf Danton Cc: Vlastimil Babka , Yu Zhao , linux-mm@kvack.org, linux-kernel@vger.kernel.org, willy@infradead.org, Mel Gorman , "Dadhania, Nikunj" , "Upadhyay, Neeraj" References: <20240717111510.1260-1-hdanton@sina.com> Content-Language: en-US From: Bharata B Rao In-Reply-To: <20240717111510.1260-1-hdanton@sina.com> Content-Type: text/plain; charset=UTF-8; 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6pc6h7ya7wIOHZRsMWh2iKYK6RoLEjbU/8r0HBMEKz4ehw26hJWDSJ/KWF7Ulx2Orf3QF8kDAL6GHsuLFC7+CZgRuiwAq7Aza20YBvqUYzesrBMMo4Jmh0BBdIFRmHWvvIV0wdnDRx4KCbS8ml5YoIaCBumRnHUPNHKs74n/BAt59HK8JeLCjMwnslVEfon8sTd9hO4/JiSXkqAY9tXyAUZE0V+4pzrk53dE0hhZh5GSzLSTgvEBnxFKZeTkJrRorq1VedUwg9S7a6+Q= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 17-Jul-24 4:45 PM, Hillf Danton wrote: > On Wed, 17 Jul 2024 16:20:04 +0530 Bharata B Rao >> On 17-Jul-24 3:07 PM, Vlastimil Babka wrote: >>> >>> It seems weird to me to see anything that would require ZONE_DMA allocation >>> on a modern system. Do you know where it comes from? >> >> We measured the lruvec spinlock start, end and hold >> time(htime) using sched_clock(), along with a BUG() if the hold time was >> more than 10s. The below case shows that lruvec spin lock was held for ~25s. >> > What is more unusual could be observed perhaps with your hardware config but > with 386MiB RAM assigned to each node, the so called tight memory but not > extremely tight. Hardware config is this: Dual socket AMD EPYC 128 Core processor (256 cores, 512 threads) Memory: 1.5 TB 10 NVME - 3.5TB each available: 2 nodes (0-1) node 0 cpus: 0-127,256-383 node 0 size: 773727 MB node 1 cpus: 128-255,384-511 node 1 size: 773966 MB But I don't quite follow what you are hinting at, can you please rephrase or be more verbose? Regards, Bharata.