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    SubjectRe: Locking comment on shrink_caches()
    and for completeness

    VIA Cyrix CIII (original generation 0.18u)

    nothing: 28 cycles
    locked add: 29 cycles
    cpuid: 72 cycles

    Pentium Pro

    nothing: 33 cycles
    locked add: 51 cycles
    cpuid: 98 cycles

    (base comparison - pure in order machine)

    IDT winchip

    nothing: 17 cycles
    locked add: 20 cycles
    cpuid: 33 cycles

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