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SubjectRe: [patch] Katmai/PIII support for Linux pre-2.2.2-1
> please take a look at my patch, it pretty much shows that are lots of
> other things to be taken care of, not only context switching. (ptrace,
> signals, ELF compatibility)

Did you provide an interface to get the complete FPU state yet ? I don't
think developing code will be much fun when you cannot see the XMMX registers...

> I dont think dynamic usage is achievable in a sane way, and i dont think it's desirable.

I cannot think of anything that could not be handled in a clean and not-to-slow
way (AFAIK, ptrace FPU access is mostly used when debugging which is not normally
performance-critical).

> we _have_ a common kernel, which is called CONFIG_M386. PII kernels

This common kernel does not have security holes (that can be fixed).

Even though it does not use 486+-specific instructions, it has no serious
performance impact. For games, we are talking about 30% - 60% here IMO.

> It makes tons of sense.

Yes. Nevertheless, the main reason (I think) for splitting up the architecture
is to achieve maximal performance for a given processor.

> no Philipp, this is one of the reasons why i didnt use the approach in
> your patch. It's just so ugly to do boot-time linking that way. Also

IA32 _is_ ugly.

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