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Mon, 8 Mar 2021 12:16:17 +0000 Date: Mon, 8 Mar 2021 08:16:15 -0400 From: Jason Gunthorpe To: Zhu Yanjun Cc: Leon Romanovsky , Doug Ledford , RDMA mailing list , maorg@nvidia.com Subject: Re: Fwd: [PATCH 1/1] RDMA/umem: add back hugepage sg list Message-ID: <20210308121615.GW4247@nvidia.com> References: <20210307221034.568606-1-yanjun.zhu@intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Originating-IP: [142.162.115.133] X-ClientProxiedBy: BL0PR1501CA0008.namprd15.prod.outlook.com (2603:10b6:207:17::21) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (142.162.115.133) by BL0PR1501CA0008.namprd15.prod.outlook.com (2603:10b6:207:17::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3912.17 via Frontend Transport; Mon, 8 Mar 2021 12:16:16 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lJEo3-008wo7-Fj; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?jnnCmeAOcP7jBRFUdxn/PnP/anfxkaNoq+pfBHtPkT8B0Tq6AvVm6en7VpdU?= =?us-ascii?Q?RVColkcEiZ0VnuWOsHIdD0/8ML4RQTTYu7fCHVyc0IGbDw1u48QmpbRH7BDS?= =?us-ascii?Q?QqZXoN4DSmWz/aId/UOhjFNdZXamWniy8dTdpKYlRxXi5fOqs4UNNrsHR9hL?= =?us-ascii?Q?o6nxjPDSeVjYtMXpjHpACuNXHb4gAPjaMhaaZT2/A6RfF/qB+FE0Zud8vv3I?= =?us-ascii?Q?C5eKScgeuMpiD23Knh6Tk8ZTs2TQ2pJGNuKjjLPF6TfFOuXSWr+MmC2Xv2ND?= =?us-ascii?Q?3RUsA4neH1BAvNqd1PvRRWDgY8POlI1UKmH617UqfsWEyskv/FAobH5mPKwV?= =?us-ascii?Q?gwRJfqO0xRxS6fl9d1FAKQ3DYnpWsyxWHMsp0EcXx8q4YrDK0S3U4Z60C45o?= =?us-ascii?Q?49NdOGf8+fXukd7foEV6JiGmbGQyjADwxCwap+oUL8Wy5QfhKjmH4ElN0THF?= =?us-ascii?Q?WVwjS0It2UFkN7OGzT4UTSNbtY5VDBQ0v5Ccal+CbHIgpMs7mlus9bZrG1eJ?= =?us-ascii?Q?pH8/ROPwrHxIHWDM6nSEslwiB2FfWjiGJJnOydW8VykKdKiNh7dOa/G1tpvF?= =?us-ascii?Q?RY/dWkuApisj0gwoMeQK5WENUOkbcbEdSNEpq4v3keNwk5JMxvBSt/6I2JDq?= =?us-ascii?Q?Pk88zBZKvBil+QWBIGjluSgevmz2cMGsr+avFLs/3RxzUc1gPBZUiuUGnF4k?= =?us-ascii?Q?OPVlg3nDotLDK2L0WSF0zPbA/HUDabnOQrOOGQ011s3JyWcDsFMZx1ia0zFf?= =?us-ascii?Q?735cMYYA7jp7QsxUdxcgCRkEqZN3UTRXzavq8NZ5AvtWOlDlqlXMnUbLZCwh?= =?us-ascii?Q?1Bv6otZvjyrXiV43qFcC1dqZwo+thZO+5Glb29DmqRcI0KHYnXuWlj/Tl4hm?= =?us-ascii?Q?jUxuGyqnyLmZwcEpe6N6tuet3LNOXRyQ25gMVgh32t5DFP0fxrYWPkXIRK+L?= =?us-ascii?Q?OsSSNLZ0NTydNvBgpH0oW1ZzCEChZx3V+vdHhHib12OHpR8CNJILS1YD1mlR?= =?us-ascii?Q?WLuy4s8HMdOnkBVRme0AlAw/UNiULZgZtERtYDv42U29WBtOhFR4D3Hv+X/H?= =?us-ascii?Q?bxSA6aX7K7AYCX3Tz2LkLkhSWJjs2kku2VG9Hcbc52ZC2DEOKQC5/jEW8DnQ?= =?us-ascii?Q?Ii+k92hxGrnwGMApe/XwcZZMupVBfnuqtUkBssLwsDvsxwEuowD36PZp2pid?= =?us-ascii?Q?LqsRQGg5dUaWOcYDjZXUoR43SFbp8hiPQNUIEM+aPFj0s2ubaQDiHhTFdhrY?= =?us-ascii?Q?hJRoUnSAkR81ZtPRBPTVFxzecQMDE2yb6P1adD//LMVVE9WWfHuw9EDwM99t?= =?us-ascii?Q?FuqbxcHeeeCJk2+FDH0+h4+3?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7ccad50a-3223-4645-1365-08d8e22bf95f X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3834.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2021 12:16:17.2881 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: FE1WWljyZIscH0/IzTdsy9wbLlNHLHuUVqLyIrIa6Gwv7b62QUGHSI5wLp+A4PhB X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0106 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Mon, Mar 08, 2021 at 06:13:52PM +0800, Zhu Yanjun wrote: > And I delved into the source code of __sg_alloc_table_from_pages. I > found that this function is related with ib_dma_max_seg_size. So > when ib_dma_max_seg_size is set to UINT_MAX, the sg dma address is > 4K (one page). When ib_dma_max_seg_size is set to SZ_2M, the sg dma > address is 2M now. That seems like a bug, you should fix it Jason