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    SubjectRe: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7
    Benjamin Herrenschmidt wrote:
    > On Wed, 2010-01-20 at 16:09 -0600, Joel Schopp wrote:
    >
    >> I can turn that into a conditional branch (case statement) with a shift
    >> for the common 1,2,4 cases which should cover all procs available today
    >> falling back to a divide for any theoretical future processors that do
    >> other numbers of threads.
    >>
    >
    > Look at the cputhreads.h implementation ... Today we only support
    > power-of-two numbers of threads.
    >
    I've run 3 threads using cpu hotplug to offline 1 of the 4. It's
    certainly a stupid idea, but there you go.


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