mtune -- System Administration

Define tunable kernel variables
/etc/conf/mtune

File mtune  defines all of the tunable variables  within the kernel.  These
variables let you configure some  aspects of your kernel, without having to
modify the kernel's drivers or recompile the kernel.

Command idmkcoh reads  this file when it builds a  new kernel, and uses its
contents to help  patch the newly build kernel.  A  mkdev script (kept in a
subdirectory  of /etc/conf)  also  sets appropriate  variables within  this
file, based on your answers to its questions.

Each line  within mtune defines one tunable parameter.   A line consists of
four fields, as follows:

1. Name
     This field names the parameter.  It cannot exceed 20 characters.

2. Minimum Value
     The legal minimum value of this parameter.

3. Default Value
     The default value for this parameter.  This value can be overridden by
     an entry in file /etc/conf/stune.

4. Maximum Value
     The legal maximum value of this parameter.

Note that  under UNIX System V,  fields 2 and 3 are  reversed.  A line that
begins with the pound sign `#' is a comment, and is ignored by idmkcoh when
it builds a new kernel.

For details on the parameters that this file sets, read the comments within
this file.

See Also

Administering COHERENT,
device drivers,
mdevice,
sdevice,
stune

Notes

mtune contains  comments that  describe the  kernel variables that  you can
tune.  If you wish to tune the kernel, you should read this file and modify
it appropriately.  The variables are documented in this file rather than in
the COHERENT  manual to ensure  that you have  exactly accurate information
about  the variables  that reside  in  the version  of the  kernel on  your
system.

© 2012 by Stephen A. Ness