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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: 7dcf48a3-a1c7-4d26-b1fb-08d8eae63356 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2021 14:49:29.6449 (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: e61QicIwHnyuYwr9LED0LRldVfItY31lvQdJIm8fdzBrHgZgzwbramQAPhbbX65xDMrQcxojYe8drz9m1gXiYw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR11MB5050 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org > From: Jason Gunthorpe > Sent: Friday, March 19, 2021 9:53 AM > To: Wan, Kaike > Cc: dledford@redhat.com; linux-rdma@vger.kernel.org; Rimmer, Todd > > Subject: Re: [PATCH RFC 0/9] A rendezvous module >=20 > On Fri, Mar 19, 2021 at 08:56:26AM -0400, kaike.wan@intel.com wrote: >=20 > > - Basic mode of operations (PSM3 is used as an example for user > > applications): > > - A middleware (like MPI) has out-of-band communication channels > > between any two nodes, which are used to establish high performance > > communications for providers such as PSM3. >=20 > Huh? Doesn't PSM3 already use it's own special non-verbs char devices tha= t > already have memory caches and other stuff? Now you want to throw that > all away and do yet another char dev just for HFI? Why? [Wan, Kaike] I think that you are referring to PSM2, which uses the OPA hfi= 1 driver that is specific to the OPA hardware. PSM3 uses standard verbs drivers and supports standard RoCE. A focus is th= e Intel RDMA Ethernet NICs. As such it cannot use the hfi1 driver through t= he special PSM2 interface. Rather it works with the hfi1 driver through sta= ndard verbs interface. The rv module was a new design to bring these concep= ts to standard transports and hardware. >=20 > I also don't know why you picked the name rv, this looks like it has litt= le to do > with the usual MPI rendezvous protocol. This is all about bulk transfers.= It is > actually a lot like RDS. Maybe you should be using RDS? [Wan, Kaike] While there are similarities in concepts, details are differen= t. Quite frankly this could be viewed as an application accelerator much l= ike RDS served that purpose for Oracle, which continues to be its main use = case. The rv module is currently targeting to enables the MPI/OFI/PSM3 appl= ication. The name "rv" is chosen simply because this module is designed to enable th= e rendezvous protocol of the MPI/OFI/PSM3 application stack for large messa= ges. Short messages are handled by eager transfer through UDP in PSM3. FYI, there is an OFA presentation from Thurs reviewing PSM3 and RV and cove= ring much of the architecture and rationale. >=20 > Jason