Ugh, I really wish the marketing people would pick different name for this evolution of SSD drives then NVMe. At least the NVM part stating: Non-Volatile Memory.<p>The current iteration of what we call NVM is just SSD on PCIe busses so they are not bound by the speed of SATA/SAS controllers.<p>Maybe it's just me but when I think NVM I think of Non-Volatile Memory something like RAM that doesn't go blank when you hit the power button. And like RAM can be mapped into (kernel or user) address space. And access to them go through processor caches (L2 or L3) strait into NVM.<p>The current SSD+ drives very much behave like the block devices of the old, just with a different host interface. Most importantly they can't be directly memory mapped without going through the page cache. That still leaves a lot of performance on the table (double copy, requiring RAM for page cache versus working set).