[openib-general] MTHCA features

[Or Gerlitz]

Roland > Memory windows are not implemented for mthca.  It wouldn't be a lot of
Roland > work for someone with access to Mellanox documentation to implement
Roland > them, but they're not particularly useful due to their performance characteristics.

By "performance characteristics" do you mean the extra overhead to generate another rkey
for the already registered address range (and also to create/free the mw)?

I guess an app that registers huge portions of memory in batch/startup time can also doing 
mw-ing in this time and not in the fast flow. It then have at hand pool of rkeys which it can 
use and recycle at run time.

Or.