With the default 128M of memory, the ramfs (which currently has a decompressed
size of ~82M) can't be completely written with the kernel and the compressed ramfs
also in memory, resulting in missing chunks of filesystem (notably /etc and /sbin for
me) on the emulated machine. This makes for a dramatically broken moby. Asking for 256M at least
gets us to some nice whale ASCII art and a console we can interact with.