Library /sys$common/syshlp/SYSGEN.HLB  —  Sys Parameters, SMP_SPINWAIT
    SMP_SPINWAIT establishes, in 10-microsecond intervals, the amount
    of time a CPU in an SMP system normally waits for access to a
    shared resource. This process is called spinwaiting.

    A timeout causes a CPUSPINWAIT bugcheck.

    The default value is 100000 (100,000 10-microsecond intervals or
    1 second).
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