Comment by amluto

I’m not entirely convinced that DirectStorage can do DMA directly from the device to the GPU. I suspect that even current NVMe devices aren’t quite fast enough for this to be a huge deal yet.

I think, but I’m not entirely sure, that Linux can do the peer to peer DMA trick. One nasty bit on any OS is that, if a portion of the data being read is cached, then some bookkeeping is needed to maintain coherence, and this adds overhead to IO. I wouldn’t be surprised if consoles had a specific hack to avoid this overhead for read-only game asset volumes.