The following parameter is specified in the RT loadable module, which controls the real-time policy:
rt_maxpri
rt_maxpri specifies the maximum priority to assign to real-time processes. The default value of rt_maxpri is 159.
If you change this parameter, you must rebuild the scheduling class tables with values that correspond to the maximum priorities that you assign.
To change the value of this parameter, enter a line in the /etc/system file with the format:
set RT:rt_maxupri=value