On Tue, 14 Aug 2007, Andi Kleen wrote: > > pci_set_consistent_dma_mask > > > > has that. > > While on x86 it is roughly identical (although the low level > allocator is currently not very reliable) it makes a significant > difference on some platforms. e.g. I was told on PA-RISC > consistent memory is much more costly than non consistent ones. > That's probably true on anything that's not full IO cache > consistent. > > So while it would be reasonable semantics for x86 and IA64 > it's not for everybody else. Right. That is the point of the function. It isolates these strange platform dependencies. That is why there is no need for ZONE_DMA32 on any other platform. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] 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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