[openib-general] Reregister Memory Region Verb

[Fab Tillier]

> From: Caitlin Bestler [mailto:caitlinb at broadcom.com]
> Sent: Wednesday, January 25, 2006 9:22 AM
> 
> >> although we would prefer that it wouldn't block if possible
> >
> > mmm. All the current memory registration verbs both user and
> > kernel are blocking, is it an issue for you?
> >
> 
> If you need to do memory registrations in a context where
> blocking is not an option then you really need FMR work
> requests as in RDMAC and InfiniBand 1.2 verbs.

No.  The blocking semantics of memory registration APIs is a deliberate design
choice and not a limitation of the hardware.  It is possible (though more
complicated) to make the API asynchronous.  No existing IB stack to date has
ever done so, however.

- Fab