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    SubjectRe: How is user space notified of CPU speed changes?
    On Sun, Oct 24, 2004 at 12:35:46AM +0100, Jon Masters wrote:
    > Out of sheer interest, you said you had an example box which did this.
    > I've never actually seen a modern SMP setup with different cock
    > frequencies (even accepting it's possible) - can you give me a more
    > modern example? I'm sure they're out there, I've just missed it, and I
    > have to confess to not being aware that Linux supported this kind of
    > setup.

    I have a dual celeron with a 433 CPU and a 466 CPU in the slots.
    It works, as long as you don't rely on TSC synchronicity. Also, IBM
    x440 boxes don't sync the TSCs between each group of 4 CPUs (that is,
    each group of 4 is synced internally, but different from each other
    group of 4).

    Joel

    --

    "Vote early and vote often."
    - Al Capone

    Joel Becker
    Senior Member of Technical Staff
    Oracle Corporation
    E-mail: joel.becker@oracle.com
    Phone: (650) 506-8127
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