VMS Help Sys Parameters, ZERO_LIST_HI  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (Alpha only) ZERO_LIST_HI is the maximum number of pages zeroed
    and put on the zeroed page list. This list is used as a cache
    of pages containing all zeros, which improves the performance of
    allocating such pages.

    ZERO_LIST_HI has the AUTOGEN and DYNAMIC attributes.