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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by CO1NAM11FT111.mail.protection.outlook.com (10.13.174.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6500.47 via Frontend Transport; Wed, 5 Jul 2023 10:53:12 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Wed, 5 Jul 2023 05:53:11 -0500 Received: from xhdipdslab41.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2507.23 via Frontend Transport; Wed, 5 Jul 2023 05:53:09 -0500 From: Nipun Gupta To: CC: , , , , , , , Nipun Gupta Subject: [PATCH] doc: add information to update dma entry limit Date: Wed, 5 Jul 2023 16:23:07 +0530 Message-ID: <20230705105307.5495-1-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT111:EE_|PH8PR12MB7302:EE_ X-MS-Office365-Filtering-Correlation-Id: c3798ffd-1391-4610-c4df-08db7d460753 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jul 2023 10:53:12.5607 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c3798ffd-1391-4610-c4df-08db7d460753 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT111.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7302 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org VFIO module provides configurable dma_entry_limit parameter to store the DMA entries. By default this is 64K and if we are using --no-huge, we shall need to increase the value of dma_entry_limit. Add commands in linux_gsg document to change the dma_entry_limit. Signed-off-by: Nipun Gupta --- doc/guides/linux_gsg/linux_drivers.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/linux_drivers.rst index 2cec1ebede..b729bb38a8 100644 --- a/doc/guides/linux_gsg/linux_drivers.rst +++ b/doc/guides/linux_gsg/linux_drivers.rst @@ -180,6 +180,21 @@ VFIO module parameter ``dma_entry_limit`` with a default value of 64K. When application is out of DMA entries, these limits need to be adjusted to increase the allowed limit. +When ``no-huge`` parameter is used, the page size used is of smaller size of +``4K`` or ``64K`` and we shall need to increase ``dma_entry_limit``. +To update the ``dma_entry_limit``, ``vfio_iommu_type1`` has to be loaded with +additional module parameter: + +.. code-block:: console + + modprobe vfio_iommu_type1 dma_entry_limit=512000 + +Alternatively, one can also change this value in an already loaded kernel module: + +.. code-block:: console + + echo 512000 > /sys/module/vfio_iommu_type1/parameters/dma_entry_limit + Creating Virtual Functions using vfio-pci ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~