System Administration Guide

Real-Time Parameter Table

A default version of rt_dptbl is delivered with the system in the /kernel/sched/RT_DPTBL loadable module.

The dispadmin -c RT -g command displays rt_dptbl information similar to the following.

$ dispadmin -c RT -g
# Real Time Dispatcher Configuration
RES=1000
 
# TIME QUANTUM                    PRIORITY
# (rt_quantum)                      LEVEL
      1000                    #        0
      1000                    #        1
      1000                    #        2
      1000                    #        3
      1000                    #        4
      1000                    #        5
      1000                    #        6
      1000                    #        7
      1000                    #        8
      1000                    #        9
       800                    #       10
       800                    #       11
       800                    #       12
       800                    #       13
       800                    #       14
       800                    #       15
       800                    #       16
       800                    #       17
       800                    #       18
       800                    #       19
       600                    #       20
       600                    #       21
       600                    #       22
       600                    #       23
       600                    #       24
       600                    #       25
       600                    #       26
       600                    #       27
       600                    #       28
       600                    #       29
       400                    #       30
       400                    #       31
       400                    #       32
       400                    #       33
       400                    #       34
       400                    #       35
       400                    #       36
       400                    #       37
       400                    #       38
       400                    #       39
       200                    #       40
       200                    #       41
       200                    #       42
       200                    #       43
       200                    #       44
       200                    #       45
       200                    #       46
       200                    #       47
       200                    #       48
       200                    #       49
       100                    #       50
       100                    #       51
       100                    #       52
       100                    #       53
       100                    #       54
       100                    #       55
       100                    #       56
       100                    #       57
       100                    #       58
       100                    #       59
$

Table 67-4 describes the fields in the real-time parameter table.

Table 67-4 Fields in the rt_dptbl Table


Field Name	Description
`rt_glbpri`	Contains global priorities. Processes put in queues at the higher priority levels run first. Note that the `dispadmin` command, which you can use to display the table, shows only the relative priorities within the class, and not the global priorities. This column cannot be changed with `dispadmin`.
`rt_qntm`	Describes the default time slice (in milliseconds) a process with this priority (`rt_glbpri`) may run before the scheduler gives another process a chance. The time slice for a real-time process can be specified with the `priocntl -t` command.