>>>> Also, can you point to a definition of the MDT interface?  Are there
>>>> any consumers of it already in the tree so I can see how it works?
>>>> All this talk of it has made me quite curious.
>>> No.  The only consumer I know of for MDT is Cassini.  I doubt it will 
>>> ever be opened, but I certainly don't speak for the powers that be.  
>>> (Otherwise it would long ago have been ported to GLDv3 and open 
>>> sourced. :-)
>> It seems to also be in GLDv2, but only for use of Infiniband
>> drivers.  gld_register() seems to allow on IB to use MDT.
> 
> Interesting, I had forgotten about that one.  IB should be ported to 
> GLDv3, if not already done.  (I know I code reviewed such a while back.  
> Not sure if it ever integrated.)
> 
Yes, the ibd driver has been ported to GLDv3. I think there was concern 
that there could be performance regression with the GLDv3 ibd driver since 
GLDv3 doesn't support MDT, and I am not sure what is the final number. But 
since the porting is done, I guess it turned out to be a non issue.

- Cathy
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