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SubjectRe: SMP scalability: 8 -> 32 CPUs

Larry McVoy writes:

> The basic point is that if you do both SMP and UP have two choices:
>
> - #ifdef SMP the kernel and essentially run one kernel on UP
> and a different kernel on SMP
>
> - No ifdefs, run the SMP kernel on the UP's

- Self-modifying kernel

> The first choice is the route taken by SGI,
> the second is the route taken by Sun.

The third is the route taken by Digital (Compaq).

The kernel can modify itself to adjust for 5 different environments:
plain, SMP, real-time, real-time SMP, and debug checks.

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