Comment by cperciva

That's in Firecracker, time it takes to boot the kernel aka before we start running init.

Including userland -- i.e. "boot to login prompt" -- it's around 450 ms on the same VM; I haven't optimized the userland bits all that much yet.

Real hardware will take longer and will vary of course; we can't do anything about the time between poweron and when the boot loader starts running, for example.