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Mon, 23 Mar 2020 19:14:14 +0000 From: Chaitanya Kulkarni To: Tokunori Ikegami , "linux-block@vger.kernel.org" CC: "linux-nvme@lists.infradead.org" Subject: Re: [PATCH] block, nvme: Increase max segments parameter setting value Thread-Topic: [PATCH] block, nvme: Increase max segments parameter setting value Thread-Index: AQHWAUA5EvS/8ZhR70KjGhHcFopwzQ== Date: Mon, 23 Mar 2020 19:14:14 +0000 Message-ID: References: <20200323182324.3243-1-ikegami.t@gmail.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=Chaitanya.Kulkarni@wdc.com; x-originating-ip: [199.255.45.62] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: d8b38743-349d-4901-bde5-08d7cf5e601c x-ms-traffictypediagnostic: BYAPR04MB5143: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:883; x-forefront-prvs: 0351D213B3 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(376002)(346002)(136003)(366004)(396003)(39860400002)(199004)(8936002)(26005)(86362001)(4744005)(33656002)(110136005)(9686003)(66476007)(64756008)(66556008)(66446008)(478600001)(55016002)(66946007)(316002)(76116006)(81156014)(7696005)(186003)(6506007)(53546011)(52536014)(4326008)(81166006)(5660300002)(2906002)(71200400001)(8676002);DIR:OUT;SFP:1102;SCL:1;SRVR:BYAPR04MB5143;H:BYAPR04MB4965.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: /JX8vkiwZUCPETUchkvwdDciF88PrJdVWsGAsAXNTvHMCd2WTmsc8TKlVuMdePhVzO7ckxKA1GlS2pJ5G/kgXb0eaO2i3ZZ+X+FmaBG4PGdM2YH+9g0jLZlKEh9zqkUz1ElG/aEHi5JSggX5SY5uiZ3eX3ai111WQgTS+2N23hB1JERAffFWdPox8MKwEhBg/eVbPobHamhaJMCWjp9pcI7ywlZRRpKtiqJibJglKGt9r6Y/1uYuz0NO4k/C1g1YsTG7kpy4rdTNFOMZEp3UOYTIvBJKLAq87PDfjrQo0USQMPxmj33aiGxgjrXdedLSRkQhZgqyqwIMVtouGKn2fEyefBx5RUUvXVIrscNAOrwKRlAHw1jztgTIcVcwHoSfpdbBQd64zaRbtfsfOSVGHEwrweyKyCq0GV6S6FVrLzIc486ZBAgJVj8ivCYKHzAF x-ms-exchange-antispam-messagedata: SQDTvR+mF45Ys417sXHZYWgMopd4JG+a4ze9ZKrxtY7XKVgvIO9YfUUmfpYPpoENQO1Smj5KUbHZqTPAz/Yts4Ctf8lwJ6VWePj78QurXQeRkrVJmEH/fpbhzNAXdMRJPEI8uOOJ4Q5pBXuw5LTUVg== x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: d8b38743-349d-4901-bde5-08d7cf5e601c X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Mar 2020 19:14:14.1636 (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: wrt+OgYb4uOc9gC9IdrLH++aPouK2Sm7lt+Z4FCiJMYSusn0SOorN5bWzD98zxQy/q6XKPTS+og6gERAUXsg//XnW79UvsAtlBWj6juPXvE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB5143 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 03/23/2020 11:24 AM, Tokunori Ikegami wrote:=0A= > Currently data length can be specified as UINT_MAX but failed.=0A= > This is caused by the max segments parameter limit set as USHRT_MAX.=0A= > To resolve this issue change to increase the value limit range.=0A= >=0A= > Signed-off-by: Tokunori Ikegami=0A= > Cc:linux-block@vger.kernel.org=0A= > Cc:linux-nvme@lists.infradead.org=0A= =0A= The change looks okay, but why do we need such a large data length ?=0A= =0A= Do you have a use-case or performance numbers ?=0A=