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b=Fh6UApUz8n3gh6XlDNO1rA1HVjzhvNOPnbzCxRd59BidW+OYJpwxxmRo21EcVElrD/Cqye/UTZNrJxr+2+FzOTXR2MXwJT35Aa4XIugG1ewgfgeArDitOs2AP3qoC2eeZnRCB+yp1mcAscrl9Q8nrPkYG5iCs5Sv1pqrvg9pgvU= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from IA1PR12MB6434.namprd12.prod.outlook.com (2603:10b6:208:3ae::10) by CH0PR12MB8532.namprd12.prod.outlook.com (2603:10b6:610:191::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7784.14; Mon, 22 Jul 2024 04:12:28 +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; Mon, 22 Jul 2024 04:12:27 +0000 Message-ID: <7104d206-7ea4-4471-bbc8-0513350ff8b3@amd.com> Date: Mon, 22 Jul 2024 09:42:17 +0530 User-Agent: Mozilla Thunderbird Subject: Re: Hard and soft lockups with FIO and LTP runs on a large system To: Yu Zhao Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, nikunj@amd.com, "Upadhyay, Neeraj" , Andrew Morton , David Hildenbrand , willy@infradead.org, vbabka@suse.cz, kinseyho@google.com, Mel Gorman , mjguzik@gmail.com References: <1998d479-eb1a-4bc8-a11e-59f8dd71aadb@amd.com> <7a06a14e-44d5-450a-bd56-1c348c2951b6@amd.com> <893a263a-0038-4b4b-9031-72567b966f73@amd.com> Content-Language: en-US From: Bharata B Rao In-Reply-To: Content-Type: text/plain; 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Was it page cache or swap? This is how a typical dstat report looks like when we start to see the problem with lruvec spinlock. ------memory-usage----- ----swap--- used free buff cach| used free| 14.3G 20.7G 1467G 185M| 938M 15G| 14.3G 20.0G 1468G 174M| 938M 15G| 14.3G 20.3G 1468G 184M| 938M 15G| 14.3G 19.8G 1468G 183M| 938M 15G| 14.3G 19.9G 1468G 183M| 938M 15G| 14.3G 19.5G 1468G 183M| 938M 15G| As you can see, most of the usage is in buffer cache and swap is hardly used. Just to recap from the original post... ==== FIO is run with a size of 1TB on each NVME partition with different combinations of ioengine/blocksize/mode parameters and buffered-IO. Selected FS tests from LTP are run on 256GB partitions of all NVME disks. This is the typical NVME partition layout. nvme2n1 259:4 0 3.5T 0 disk ├─nvme2n1p1 259:6 0 256G 0 part /data_nvme2n1p1 └─nvme2n1p2 259:7 0 3.2T 0 part Though many different runs exist in the workload, the combination that results in the problem is buffered-IO run with sync engine. fio -filename=/dev/nvme1n1p2 -direct=0 -thread -size=1024G \ -rwmixwrite=30 --norandommap --randrepeat=0 -ioengine=sync -bs=4k \ -numjobs=400 -runtime=25000 --time_based -group_reporting -name=mytest ==== Regards, Bharata.