To clarify for readers who aren't current on all the lingo: app direct mode refers to one of the modes for using the Optane persistent memory modules that conne

To clarify for readers who aren't current on all the lingo: app direct mode refers to one of the modes for using the Optane persistent memory modules that connect to the CPU's DRAM controller. It doesn't apply to the Optane NVMe SSDs that use PCI Express and require the software overhead of a traditional IO stack. In a few years, something like CXL may allow for something close to the app direct mode to be usable on persistent memory devices with an SSD-like form factor, but we're not there yet.