> It seems the obvious way to do this was to have SMB mounts on either side and optimize the hell out of the already existing SMB implementations on both OSes t

> It seems the obvious way to do this was to have SMB mounts on either side and optimize the hell out of the already existing SMB implementations on both OSes to get the performance close enough to disk. That's basically what they're doing, only that it's not SMB but 9p protocol servers. Here is a video where they discuss the WSL2 architecture. The link is time-stamped to go to an overview picture of the architecture. https://www.youtube.com/watch?v=lwhMThePdIo&t=2435 https://www.youtube.com/watch?v=lwhMThePdIo&t=2435