That's not even mentioning the fact that the user may register external memory for DMA which may cause the window to be of insufficient size to cover said external memory.
Regarding external memory, I can think of two obvious options:
1) Skip window sizing altogether if external memory is detected and assume the user has set things up appropriately. 2) Add an EAL command line option --iova-len that would allow the external memory requirements to be considered it required.
I'll work on a new patch with (2) along with the other changes discussed and resubmit. Thanks for the feedback.
Dave
