/sys$common/syshlp/helplib.hlb Sys Parameters, TIME_CONTROL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    This special parameter is used by Compaq and is subject to
    change. Do not change this parameter unless Compaq recommends
    that you do so.

    TIME_CONTROL is an SMP bit mask parameter that controls debugging
    functions. The following bits are defined:

    Bit                    Description

    0                      Obsolete.
    1 (EXE$V_SANITY)       Disables the SMP sanity timer support.
    2 (EXE$V_NOSPINWAIT)   Disables the functional behavior of the
                           SMP spinwait support.

    TIME_CONTROL is a DYNAMIC parameter.