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Wed, 4 Mar 2020 02:38:43 +0000 From: Shinichiro Kawasaki To: "linux-block@vger.kernel.org" , Jens Axboe , Ming Lei CC: Damien Le Moal Subject: commit 01e99aeca397 causes longer runtime of block/004 Thread-Topic: commit 01e99aeca397 causes longer runtime of block/004 Thread-Index: AQHV8c4FlOkNXDceTU6Nwl3i3vnr/A== Date: Wed, 4 Mar 2020 02:38:43 +0000 Message-ID: <20200304023842.gu37d4mzfbseiscw@shindev.dhcp.fujisawa.hgst.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=shinichiro.kawasaki@wdc.com; x-originating-ip: [199.255.47.12] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 24c6aa78-b063-42b1-0ca8-08d7bfe527f4 x-ms-traffictypediagnostic: CY1PR04MB2283: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:1186; x-forefront-prvs: 0332AACBC3 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(376002)(346002)(39860400002)(136003)(366004)(396003)(189003)(199004)(66556008)(81156014)(71200400001)(9686003)(6512007)(81166006)(86362001)(66476007)(5660300002)(64756008)(6486002)(4326008)(91956017)(8676002)(76116006)(1076003)(66946007)(66446008)(6506007)(4744005)(316002)(110136005)(44832011)(26005)(186003)(8936002)(2906002)(478600001)(148743002);DIR:OUT;SFP:1102;SCL:1;SRVR:CY1PR04MB2283;H:CY1PR04MB2268.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-ms-exchange-antispam-messagedata: itsbSgUvj9iqdrIXxh7wsg8u+k6tguVFWQRv/LvHHL1q/LlgzU6K8xE0KTXTFCrm/G92zZG61/L5sYCoT306OBArDPoL95extFNydT9C//e+p1HAvPO/rDDY1qs38ZDphrpchA/xKZq75M73ySdbrQ== Content-Type: text/plain; charset="us-ascii" Content-ID: <3EF166F4FDFAC349ABCAAA4FA0A950C0@namprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 24c6aa78-b063-42b1-0ca8-08d7bfe527f4 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Mar 2020 02:38:43.3526 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ZFL8kn9kJeM0Z/5vp3WoZnhNVBfKcdpa7t8gTDIuwXGdj+qizfPrPZT0lmrg62B8CZ6UCXHXD/lLo4BgSMev9LKVLHkrAKW5ULNIcn9e0fc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR04MB2283 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org I noticed that blktests block/004 takes longer runtime with 5.6-rc4 than 5.6-rc3, and found that the commit 01e99aeca397 ("blk-mq: insert passthroug= h request into hctx->dispatch directly") triggers it. The longer runtime was observed with dm-linear device which maps SATA SMR H= DD connected via AHCI. It was not observed with dm-linear on SAS/SATA SMR HDDs connected via SAS-HBA. Not observed with dm-linear on non-SMR HDDs either. Before the commit, block/004 took around 130 seconds. After the commit, it = takes around 300 seconds. I need to dig in further details to understand why the commit makes the test case longer. The test case block/004 does "flush intensive workload". Is this longer run= time expected? --=20 Best Regards, Shin'ichiro Kawasaki=