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> 1. Shouldn't there be *four* zones: (DMA, low, high and PAE)? 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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