From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751907AbdJMQbL (ORCPT ); Fri, 13 Oct 2017 12:31:11 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:57580 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750973AbdJMQbJ (ORCPT ); Fri, 13 Oct 2017 12:31:09 -0400 X-IronPort-AV: E=Sophos;i="5.43,371,1503331200"; d="scan'208";a="58227273" From: Bart Van Assche To: "ming.lei@redhat.com" , "axboe@kernel.dk" CC: "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "hch@infradead.org" , "tom81094@gmail.com" , "paolo.valente@linaro.org" , Bart Van Assche , "linux-scsi@vger.kernel.org" , "oleksandr@natalenko.name" , "john.garry@huawei.com" , "osandov@fb.com" , "loberman@redhat.com" Subject: Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops Thread-Topic: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops Thread-Index: AQHTQ4lc2pZDXOhe5U6IuYSs5ux9RaLgjbsAgABdCgCAAPGtgIAAF0GAgAAGiAA= Date: Fri, 13 Oct 2017 16:31:04 +0000 Message-ID: <1507912260.13345.0.camel@wdc.com> References: <20171012183704.22326-1-ming.lei@redhat.com> <20171012183704.22326-5-ming.lei@redhat.com> <9a741c03-90a3-e583-ddde-0ed71c8570a2@kernel.dk> <20171013001919.GA24715@ming.t460p> <6efdb459-8746-562d-06dc-5b3e172076e1@kernel.dk> <20171013160731.GA30899@ming.t460p> In-Reply-To: <20171013160731.GA30899@ming.t460p> 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=Bart.VanAssche@wdc.com; x-originating-ip: [63.163.107.201] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;CY1PR0401MB1533;20:DaOvaPijwAPaJbsFr7RjEAigegGD1n5Clj729rx3E9OqlHRNdtXLXuERRFhXaZYe+IhI19x1ujD5cHr0Xm+rR81AJJiS0steTrYHdDXZzQdegstWmtNd0OYwsqDTO49X3F6CJtZpWJAB54zegiGN5SmPDUcLN5VqhKrUGWCaf4E= x-ms-exchange-antispam-srfa-diagnostics: SSOS;SSOR; x-ms-office365-filtering-correlation-id: a7ec4c39-a0aa-452f-1bf4-08d51257cc69 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001)(2017030254152)(48565401081)(2017052603199)(201703131423075)(201703031133081)(201702281549075);SRVR:CY1PR0401MB1533; x-ms-traffictypediagnostic: CY1PR0401MB1533: wdcipoutbound: EOP-TRUE x-exchange-antispam-report-test: UriScan:; x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(2401047)(8121501046)(5005006)(100000703101)(100105400095)(93006095)(93001095)(3002001)(10201501046)(6055026)(6041248)(20161123555025)(20161123560025)(20161123558100)(20161123564025)(20161123562025)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(6072148)(201708071742011)(100000704101)(100105200095)(100000705101)(100105500095);SRVR:CY1PR0401MB1533;BCL:0;PCL:0;RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095);SRVR:CY1PR0401MB1533; x-forefront-prvs: 04599F3534 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(39860400002)(346002)(376002)(24454002)(199003)(377424004)(189002)(66066001)(4326008)(68736007)(5660300001)(99286003)(105586002)(14454004)(7736002)(81166006)(8676002)(2906002)(305945005)(93886005)(53936002)(6116002)(4001150100001)(102836003)(7416002)(25786009)(3846002)(97736004)(2501003)(33646002)(6246003)(6512007)(8936002)(316002)(36756003)(101416001)(2900100001)(103116003)(50986999)(189998001)(39060400002)(478600001)(3660700001)(72206003)(6486002)(6506006)(106356001)(54906003)(6436002)(558084003)(77096006)(76176999)(3280700002)(110136005)(81156014)(54356999)(86362001)(229853002)(2950100002)(142923001);DIR:OUT;SFP:1102;SCL:1;SRVR:CY1PR0401MB1533;H:CY1PR0401MB1536.namprd04.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-ID: <994C37A8795CB94FB0747DBD27D1A885@namprd04.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Oct 2017 16:31:04.0564 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR0401MB1533 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by nfs id v9DGVGPN015675 On Sat, 2017-10-14 at 00:07 +0800, Ming Lei wrote: > Actually it is in hot path, for example, lpfc and qla2xx's queue depth is 3, Sorry but I doubt whether that is correct. More in general, I don't know any modern storage HBA for which the default queue depth is so low. Bart.