[openib-general] Re: RDMA memory registration

[Greg Lindahl]

>     Todd> But that implies the hardware has an MMU and it also puts an
>     Todd> interrupt in the path per page sent.
> 
> Well, there's one interrupt per non-resident page sent.  But nearly
> all of the time the page will be present.

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.

-- greg