Re: RDMA Multicasting

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On Thu, 9 Apr 2015, Caitlin Bestler wrote:

> > Infiniband is lossless and thus what "unreliable" means is also quite
> > foggy.
>
> InfiniBand is not lossless. It does a superb job of avoiding drops caused
> by congestion. But applications should not assume that all UD messages
> have been received, but should add their own checking. That is why the
> U stands for Unreliable.

Well applications can screw up yes but the fabric *IS* lossless.

> > > You are probably better off using RDMA ideas over UDP/UD, and doing the
> > > direct memory placement from your own code, instead.
> >
> > So send the memory transfer info via multicast datagram to the
> > endpoints and then run the transfer from the endpoint.
>
> Yes, possibly in a kermel module.

Why? You can simply do this already from userspace with verbs messaging
and RDMA tranfers.
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