Probably not. PAE isnt special. With PAE you pay the page table penalties
for all RAM.
> 2. Isn't the boundary at 2^30 really irrelevant and the three "correct"
> zones are (0 - 2^24-1), (2^24 - 2^32-1) and (2^32 - 2^36-1)?
Nope. The limit for directly mapped memory is 2^30.
> 3. On a system without ISA DMA devices, can DMA and low be merged into a
> single zone?
Rarely. PCI vendors are not exactly angels when it comes to implementing all
32bits of a DMA transfer
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