readahead does. A pre-populated benefit is minimal (from my tests), the real benefit comes from not running the coldplugin events (I don't know if it is udev, modprobe or what). But if you skip the coldplugin you need a pre-populated /dev. > > When you have the modules build into the kernel the need for modprobe > goes away for these modules, this is the biggest time improvements. Sure. Santi