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Current mempool per core cache implementation is based on pointer
For most architectures, each pointer consumes 64b Replace it with
index-based implementation, where in each buffer is addressed by
(pool address + index)

I don't think it is going to work:
On 64-bit systems difference between pool address and it's elem
address could be bigger than 4GB.

Are you talking about a case where the memory pool size is more than 4GB?

That is one possible scenario.
Another possibility - user populates mempool himself with some external
memory by calling rte_mempool_populate_iova() directly.

Is the concern that IOVA might not be contiguous for all the memory used by the mempool?

I suppose such situation can even occur even with normal
rte_mempool_create(), though it should be a really rare one.

All in all, this feature needs to be configurable during compile time.

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