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[PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages To: Christoph Hellwig Cc: nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-mm@kvack.org, herbst@redhat.com, lyude@redhat.com, dakr@redhat.com, airlied@gmail.com, simona@ffwll.ch, jgg@ziepe.ca, leon@kernel.org, jglisse@redhat.com, akpm@linux-foundation.org, dri-devel@lists.freedesktop.org, apopple@nvidia.com, bskeggs@nvidia.com References: <20241015152348.3055360-1-ymaman@nvidia.com> Content-Language: en-US From: Yonatan Maman In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: FR2P281CA0181.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:9f::17) To BL1PR12MB5851.namprd12.prod.outlook.com (2603:10b6:208:396::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL1PR12MB5851:EE_|MN0PR12MB6002:EE_ X-MS-Office365-Filtering-Correlation-Id: a4741652-2e00-4d5f-ea20-08dcedf585d5 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VGwnAtjsq30lLg3jd0LGz6wgqIV5noqgozPl3NNdFVMlYx3Kk1uCHozIsG3zrHL5T1dIFnX4+KfHnyUppAzBZfxze14+AnwYnBm+2s/EpJ+LbbmFrCouKqRb783YKShYMtECwkVYfUc0BF08zfKc7Ye+xfMPpP/WNY4QAogyKCyXTw6lgyDKxSV18sK77crFMzFSKiUDWZ6eXHdJ2qUUCt51lLyqqOxJV45ToZ25nXS+1vsYbchxOW1ynxu6ZZXApOrq9sP8GwPkM6/ReuBKljVj/2y5IcXv/1rdELbNLB7ZY9FeIyKKlIWyd//zdg9nhAiFe5iwQf8u10ylvKCXacfvgdhCWG9Q2sAHIbPhreUDoHuHAHy0I3uOf40i09IQXv2n7fal0ZtPUQTKjsYaOrz/drbdD3CntDWq2 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 16/10/2024 7:23, Christoph Hellwig wrote: > On Tue, Oct 15, 2024 at 06:23:44PM +0300, Yonatan Maman wrote: >> From: Yonatan Maman >> >> This patch series aims to enable Peer-to-Peer (P2P) DMA access in >> GPU-centric applications that utilize RDMA and private device pages. This >> enhancement is crucial for minimizing data transfer overhead by allowing >> the GPU to directly expose device private page data to devices such as >> NICs, eliminating the need to traverse system RAM, which is the native >> method for exposing device private page data. > > Please tone down your marketing language and explain your factual > changes. If you make performance claims back them by numbers. > Got it, thanks! I'll fix that. Regarding performance, we’re achieving over 10x higher bandwidth and 10x lower latency using perftest-rdma, especially (with a high rate of GPU memory access).