[openib-general] Re: RDMA memory registration

[Ronald G. Minnich]

On Fri, 29 Apr 2005, Bill Jordan wrote:

> I'm very confused at this point. Can you briefly explain how this works,
> or point me to a description? I don't see how you could do user level
> I/O without registering the memory with the hardware. I'm especially
> confused by the comment (may not have been yours) that the memory
> doesn't have to be pinned. 

you modify the mm layer of linux, so that the PTEs on the Quadrics card 
are in sync with teh PTEs int he mm layer. Then you are in a position to 
have a NIC incite page faults for incoming packets. 

I think greg got it right -- in practice, it's not done any more. Quadrics 
has a kernel-patch-free source base now, I'm told.

ron