[openib-general] Re: RDMA memory registration

[Greg Lindahl]

On Fri, Apr 29, 2005 at 12:33:54PM -0700, Grant Grundler wrote:

> Being mostly clueless about Quadrics implementation, I'm probably
> missing something that makes Quadrics a MMU but not the IB variants.
> Can someone clue me in please?

As far as I can tell it's mostly a marketing distinction. Many
Quadrics customers run with memory registration, and Mellanox could
probably alter their firmware to not require registration.  Myricom
certainly can, and in fact Patrick Geoffrey claimed they were doing so
in their MX software. The only one I know of that isn't that flexible
is PathScale's InfiniPath. Ours is a pure hardware mechanism, but it
requires memory registration and is clearly not an MMU.

Confused yet?

-- greg