
        This can be accomplished using the <TT
CLASS="COMMAND"
>sysctl</TT
>
        setting <TT
CLASS="LITERAL"
>kern.ipc.shm_use_phys</TT
>.
       </P
><P
>        If running in FreeBSD jails by enabling <SPAN
CLASS="APPLICATION"
>sysctl</SPAN
>'s
        <TT
CLASS="LITERAL"
>security.jail.sysvipc_allowed</TT
>, <SPAN
CLASS="APPLICATION"
>postmaster</SPAN
>s
        running in different jails should be run by different operating system
        users.  This improves security because it prevents non-root 