[openib-general] SDP Memory management

[Devesh Sharma]

Hi Dror,
Thanks for replying, I still have some confusions :

On 4/11/06, Dror Goldenberg <gdror at mellanox.co.il> wrote:
>
>
> >From: Devesh Sharma
> >Sent: Monday, April 10, 2006 4:48 PM
> >
> >a) What is the concept of FMR?
> >
>
> Fast memory registration. It is an optimization of the HCA to perform
> registration faster than regular memory region.
>
> >b) In absence of FMR support what is the buffer management scheme for
> Z-Copy?
> >Will SDP work without FMR?
>
> I think that the easiest way out is to implement FMR in the HCA provider
> using regular MRs. SDP strongly assumes FMR support in today's
> implementation.


Still if some provider dose not emulate FMR using regular MR then, SDP will
work?

Haven't looked deeply into it, but I think that ehca has
> done this.

>c) How page locking and virtual to physical address conversion is done
> for Z-
> >Copy buffers?
>
> Take a look at sdp_iocb.c


In short I wanted to know that at driver level whatever address is reaching
in ib_sge.addr is a physical address? page locking and virtual to physical
address translation is taken care by SDP module?

>Devesh
>
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