If I enable Hyper-Threading for my netbook which has an Intel Atom (1.6 GHz) will the kernel see two virtual 800 MHz processors? 
Will enabling Hyper-Threading create two virtual half-speed processors?
linux;kernel;cpu
No, it will create two virtual 1.6 GHz processors. (However, when not under load, they will clock down to a much lower clock speed, then 800 MHz might be correct.) Docat /proc/cpuinfofor information about them.