Rajouri Jammu wrote:
Does that mean that no matter how I size my memory regions the maximum
amount of (total) memory I can register is = 2^20 * 4K = 4GB?
I.e., Am I limited by the total number of MTTs?
Generally speaking, yes, the IB network MMU (MTT this case) is limited
in the number of slots it has and so in the amount of memory it can map
at once, but I assume this is typical eg for I/O MMUs and makes sense.
However, each slot can map --more-- then 4K, so one should be able to
use huge-pages etc. I am not sure what is the actual status of
registering huge-pages by the Linux IB stack, maybe Roland can comment
on that.
Or.
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