32 bit arch optimization suggestion

[Bruce Richardson]

On Fri, Aug 25, 2023 at 11:40:32AM +0200, Morten Brørup wrote:
> I was wondering...
> 
> How widely is DPDK used with 32 bit architectures?
> 
> Both phys_addr_t and rte_iova_t are cast as uint64_t in rte_common.h. Should they be uint32_t on 32 bit arch?
> 
I don't think they can be. Even if the address space of the process is 32
bits, the underlying physical address still has more bits. Even in the
"olden days" with 32-bit CPUs we had PAE mode where physical addresses were
36 bits and the page table entries expanded out to 64-bits to accomodate
this.

/Bruce