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Fri, 19 Mar 2021 20:59:31 +0000 From: "Wan, Kaike" To: Jason Gunthorpe , "Rimmer, Todd" CC: Dennis Dalessandro , "dledford@redhat.com" , "linux-rdma@vger.kernel.org" Subject: RE: [PATCH RFC 0/9] A rendezvous module Thread-Topic: [PATCH RFC 0/9] A rendezvous module Thread-Index: AQHXHL9OhYUmp6U+V0qfjE0DBnim76qLVNwAgAAMHVCAABQIgIAAO/qAgAAGJwCAAAexAIAAA/SAgAAFugCAAAIfAIAAAPRw Date: Fri, 19 Mar 2021 20:59:31 +0000 Message-ID: References: <20210319125635.34492-1-kaike.wan@intel.com> <20210319135302.GS2356281@nvidia.com> <20210319154805.GV2356281@nvidia.com> <29061edb-b40c-67a9-c329-3c9446f0f434@cornelisnetworks.com> <20210319194446.GA2356281@nvidia.com> <20210319202627.GC2356281@nvidia.com> <20210319205432.GE2356281@nvidia.com> In-Reply-To: <20210319205432.GE2356281@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: nvidia.com; dkim=none (message not signed) header.d=none;nvidia.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB3311.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9b392bf5-865e-41a1-82c2-08d8eb19e4cd X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2021 20:59:31.7515 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: gIx+wg3gHtTE7oeYQek9CiPPAwzSQGuXW3DI5C7gtbfjbVv9dgq7Z06CQrBlb3gRA7flIMC6gngZDlcdXWRvwg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR11MB4969 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org > From: Jason Gunthorpe > Sent: Friday, March 19, 2021 4:55 PM > To: Rimmer, Todd > Cc: Dennis Dalessandro ; Wan, > Oh, there is lots of stuff in UCX, I'm not surprised you similarities to = what > PSM did since psm/libfabric/ucx are all solving the same problems. >=20 > > > rv seems to completely destroy alot of the HPC performance offloads > > > that vendors are layering on RC QPs >=20 > > Different vendors have different approaches to performance and chose > > different design trade-offs. >=20 > That isn't my point, by limiting the usability you also restrict the driv= ers where > this would meaningfully be useful. >=20 > So far we now know that it is not useful for mlx5 or hfi1, that leaves on= ly hns > unknown and still in the HPC arena. [Wan, Kaike] Incorrect. The rv module works with hfi1. >=20 > Jason