[openib-general] Re: RDMA memory registration

[Libor Michalek]

On Fri, Apr 29, 2005 at 03:07:40PM -0600, Ronald G. Minnich wrote:
> On Fri, 29 Apr 2005, Greg Lindahl wrote:
> 
> > It doesn't imply that there's an MMU, either. I know that Myricom uses a
> > little lookup routine in software on their nic, which most people
> > wouldn't call an MMU. I don't know what Mellanox does for this, they
> > don't talk much about what's hardware and what's software on their nic.
> > I think Quadrics actually uses the TLB of their risc cpu on their nic
> > for this lookup, but that's just a guess.
> 
> but only quadrics rewrites the mm layer code ..

  Mellanox, although they have the capability, does not use the feature.
In the existing model the mellanox hardware assumes that the page is
present, hence the entire discussion about how to make sure the page
stays put and that the user mapping to that page stays put.

-Libor