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R. Silva" , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Christoph Hellwig , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, Damien Le Moal , imx@lists.linux.dev Subject: Re: [PATCH RFT 4/5] dmaengine: dw-edma: Dynamitc append new request during dmaengine running Message-ID: References: <20260109-edma_dymatic-v1-0-9a98c9c98536@nxp.com> <20260109-edma_dymatic-v1-4-9a98c9c98536@nxp.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SA0PR11CA0201.namprd11.prod.outlook.com (2603:10b6:806:1bc::26) To PAXPR04MB8957.eurprd04.prod.outlook.com (2603:10a6:102:20c::5) Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB8957:EE_|DU2PR04MB8695:EE_ X-MS-Office365-Filtering-Correlation-Id: c787c872-7217-469b-390b-08de5a89e8ba X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|52116014|7416014|376014|19092799006|38350700014; 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So add workaround to push doorbelll again when found engine stop. > > > > Get more than 10% performance gain. > > > > The before > > Rnd read, 4KB, QD=32, 4 jobs: IOPS=33.4k, BW=130MiB/s (137MB/s) > > > > After > > Rnd read, 4KB, QD=32, 4 jobs: IOPS=38.8k, BW=151MiB/s (159MB/s) > > > > Signed-off-by: Frank Li > > --- > > Hello Frank, > > First of all, I hope that your: > [PATCH v3 0/9] dmaengine: Add new API to combine configuration and descriptor preparation > series will make it to the upcoming 6.20/7.0 merge window. > > > This RFT series however breaks pci-epf-test: > > Before: > # RUN pci_ep_data_transfer.dma.READ_TEST ... > # OK pci_ep_data_transfer.dma.READ_TEST > ok 14 pci_ep_data_transfer.dma.READ_TEST > # RUN pci_ep_data_transfer.dma.WRITE_TEST ... > # OK pci_ep_data_transfer.dma.WRITE_TEST > ok 15 pci_ep_data_transfer.dma.WRITE_TEST > > After: > # RUN pci_ep_data_transfer.dma.READ_TEST ... > # READ_TEST: Test terminated by timeout > # FAIL pci_ep_data_transfer.dma.READ_TEST > not ok 14 pci_ep_data_transfer.dma.READ_TEST > # RUN pci_ep_data_transfer.dma.WRITE_TEST ... > # WRITE_TEST: Test terminated by timeout > # FAIL pci_ep_data_transfer.dma.WRITE_TEST > not ok 15 pci_ep_data_transfer.dma.WRITE_TEST > > > After a bisect, first bad commit: > commit 352fd8d5ed468ea616eb4974b5ac19203528b207 > Author: Frank Li > Date: Fri Jan 9 15:13:28 2026 -0500 > > dmaengine: dw-edma: Dynamitc append new request during dmaengine running > Thanks, let me try to fix it. Frank > > > Kind regards, > Niklas