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SubjectRe: CPU options during config
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> isn't there any way to capture a software interrupt when these new
> instructions/features are used on an old processor? i've worked on

Yes. Unknown instructions raise illegal instruction. There are also a set
of "official" ways to check chips. The problem is the run time cost of testing
often outweights the time saved. Thats why Linus stuff on the "with TSC" compile
makes a lot of sense.

Alan


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