MTUNE(4)             INTERACTIVE UNIX System             MTUNE(4)



          NAME
               mtune - file format

          SYNOPSIS
               mtune

          DESCRIPTION
               The mtune file contains information about all the system
               tunable parameters.  Each tunable parameter is specified by
               a single line in the file, and each line contains the fol-
               lowing whitespace-separated set of fields:

               1.   parameter name:  A character string no more than 20
                    characters long.  It is used to construct the prepro-
                    cessor "#define's" that pass the value to the system
                    when it is built.

               2.   default value:  This is the default value of the tun-
                    able parameter.  If the value is not specified in the
                    stune file, this value will be used when the system is
                    built.

               3.   minimum value:  This is the minimum allowable value for
                    the tunable parameter.  If the parameter is set in the
                    stune file, the configuration tools will verify that
                    the new value is equal to or greater than this value.

               4.   maximum value:  This is the maximum allowable value for
                    the tunable parameter.  If the parameter is set in the
                    stune file, the configuration tools will check that the
                    new value is equal to or less than this value.

               The file mtune normally resides in /etc/conf/cf.d.  However,
               a user or an add-on package should never directly edit the
               mtune file to change the setting of a system tunable parame-
               ter.  Instead the idtune command should be used to modify or
               append the tunable parameter to the stune file.

               In order for the new values to become effective, the UNIX
               system kernel must be rebuilt and the system must then be
               rebooted.

          SEE ALSO
               stune(4).

               idbuild(1M), idtune(1M) in the INTERACTIVE UNIX System
               User's/System Administrator's Reference Manual.








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