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Petersen" CC: "Michael Kelley (EOSG)" , Long Li , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , "James E . J . Bottomley" , "devel@linuxdriverproject.org" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH v2] storvsc: Set up correct queue depth values for IDE devices Thread-Topic: [PATCH v2] storvsc: Set up correct queue depth values for IDE devices Thread-Index: AQHTwieDOFEPhIGzxkyq2vCO89MZ9aPfnEKAgCe1+8CAAEiXFYAAFfow Date: Thu, 19 Apr 2018 04:59:12 +0000 Message-ID: References: <20180322214718.29547-1-longli@linuxonhyperv.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:4898:80e8:7::2e0] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR2101MB0810;7:c02yoXG1gA6KRSspoijLtZp2X18iVNEIiOmyLqYdqwr8CkfBTFv1RvmS24xzEKCXTNlFC1ZQ4mAhzEQG9PNNBmnf05BiCesb3DoSJMXSlzjlMhSyZFxA/6LEwvFwtGXKkxAoNJgFobPUHNbQ0FC7rpBWzjDGwB13RnzA8diXDsjguDy/gYwFGrSOZqFtvi3j6yWmLeE4tb+aFjYio+eHlIxJ6jJJItwyNsdgtsG3Doe14ShE3Jh5W2O6T4eEtdwh;20:p7fISvEgj6bV5Ck3WUuBTgHjQH9vT0TZBvT8cXXzWdrRshpAShODFQ4n7wd2AQkmPE5ef0XgFd9QSE97ZziKonRrGH5pA1FXKEUxrszmXpXQZnxsaCJUt+Kb5ifRCSVoCeWMBywR3vUabM+LxToDmogsublop67xTtn1nK1TXO4= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(4534165)(4627221)(201703031133081)(201702281549075)(5600026)(2017052603328)(7193020);SRVR:MWHPR2101MB0810; x-ms-traffictypediagnostic: MWHPR2101MB0810: authentication-results: outbound.protection.outlook.com; spf=skipped (originating message); dkim=none (message not signed) header.d=none; dmarc=none action=none header.from=microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(3002001)(10201501046)(93006095)(93001095)(3231232)(944501376)(52105095)(6055026)(61426038)(61427038)(6041310)(20161123564045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123558120)(20161123560045)(20161123562045)(6072148)(201708071742011);SRVR:MWHPR2101MB0810;BCL:0;PCL:0;RULEID:;SRVR:MWHPR2101MB0810; x-forefront-prvs: 0647963F84 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(376002)(366004)(39860400002)(39380400002)(346002)(7736002)(186003)(316002)(6116002)(10290500003)(54906003)(305945005)(6436002)(74316002)(99286004)(2906002)(86362001)(229853002)(76176011)(7696005)(478600001)(86612001)(9686003)(55016002)(5250100002)(81166006)(102836004)(2900100001)(53936002)(10090500001)(6506007)(25786009)(476003)(5660300001)(11346002)(4326008)(446003)(22452003)(8676002)(6916009)(33656002)(8936002)(14454004);DIR:OUT;SFP:1102;SCL:1;SRVR:MWHPR2101MB0810;H:MWHPR2101MB0729.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;MLV:sfv; x-microsoft-antispam-message-info: aBgCGXK1+fJ4N14b6CFfcqpIx5rTgWb5f5/RQRV8Tb/AgkzjyQlxxb8nzWfmRrFwOfN9s9BukbOaPVb/ANkrZ7Bwt7VMvWFGYXnFApFJTnsIAWrxkVpHXbfmOsy+olPJW5xDCud9ltQTyXecpJtNpgYa+uuZnCDRhCU2MDx22r4G5ZKx3X9chK6bxyHvc7nN spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 8b73e2dd-bc04-4352-86c1-08d5a5b24b02 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8b73e2dd-bc04-4352-86c1-08d5a5b24b02 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Apr 2018 04:59:12.3074 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2101MB0810 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Subject: Re: [PATCH v2] storvsc: Set up correct queue depth values for ID= E > devices >=20 >=20 > Long, >=20 > > Can you take a look at the following patch? >=20 > >> > + max_sub_channels =3D > >> > + (num_cpus - 1) / storvsc_vcpus_per_sub_channel; >=20 > What happens if num_cpus =3D 1? If num_cpus=3D1, we don't have any sub channels. The host offers one sub channel for VM with 5 CPUs, after that it offers an= additional sub channel every 4 CPUs. The primary channel is always offered. >=20 > -- > Martin K. Petersen Oracle Linux Engineering