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    SubjectRe: detecting hyperthreading in linux 2.4.19
    On Fri, Jan 10, 2003 at 08:05:07AM +0100, Mikael Pettersson wrote:

    > If the kernel has sched_setaffinity() or some other way of binding a process
    > to a given CPU (as numbered by the kernel, which may or may not be related
    > to any physical CPU numbers), then this will do it: execute CPUID on each
    > CPU and check the initial APIC ID field. If you find one that's non-zero,
    > then HT is enabled.

    That's a horrible way of reimplementing /dev/cpu/x/cpuid 8-)


    | Dave Jones.
    | SuSE Labs
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