For posterity.
1.When using MTU larger then 2K its advised to provide the value
to rte_pktmbuf_pool_init.
2.ixgbevf rounds down the ("MBUF size" - RTE_PKTMBUF_HEADROOM) to the
nearest 1K multiple when deciding on the receiving capabilities [buffer
size]of the Buffers in the pool.
The function SRRCTL register, is considered here for some reason?