> That works well until you change something that has side effects. Consider the
> Cyrix 5x86/6x86 chips. On the 5x86, you can set some bits and enable/disable the
> branch target buffer. This, of course, dramatically affects BogoMips. So, if you
> do this, you have to fiddle with a running kernel.
The options I mentioned will be processed before paging gets initialized and
probably also before bogomips detection is done.