CPU idle incorret in top on ppc64

Issue

top, vmstat commands always display CPU %id to be 0 even after confirmation that there are no more applications running on the Linux server

top output:

Tasks: 413 total,   1 running, 412 sleeping,   0 stopped,   0 zombie
Cpu(s): 50.0%us, 50.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1006784k total,   957376k used,    49408k free,   134208k buffers
Swap:  1048448k total,     4992k used,  1043456k free,   529856k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
16364 root      20   0  5824 3776 2432 R  0.3  0.4   0:00.04 top
    1 root      20   0  6272 3200 1920 S  0.0  0.3   0:01.76 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.07 kthreadd
    3 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0
    4 root      20   0     0    0    0 S  0.0  0.0   0:00.04 ksoftirqd/0
    5 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0
    6 root      RT   0     0    0    0 S  0.0  0.0   0:00.83 watchdog/0
    7 root      RT   0     0    0    0 S  0.0  0.0   0:00.11 migration/1
    8 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/1
    9 root      20   0     0    0    0 S  0.0  0.0   0:00.17 ksoftirqd/1
   10 root      RT   0     0    0    0 S  0.0  0.0   0:00.84 watchdog/1
   11 root      RT   0     0    0    0 S  0.0  0.0   0:00.83 migration/2
   12 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/2
   13 root      20   0     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/2
   14 root      RT   0     0    0    0 S  0.0  0.0   0:00.82 watchdog/2
   15 root      RT   0     0    0    0 S  0.0  0.0   0:00.21 migration/3
   16 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/3
   17 root      20   0     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/3
   18 root      RT   0     0    0    0 S  0.0  0.0   0:00.82 watchdog/3
   19 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/4
   20 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/4
   21 root      20   0     0    0    0 S  0.0  0.0   0:00.02 ksoftirqd/4
   22 root      RT   0     0    0    0 S  0.0  0.0   0:01.11 watchdog/4

vmstat output:

[root@host_name]# vmstat 2 4
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0   4992  50880 134208 529856    0    2  2151  2966 8099 16999 32 68  0  0  0
 0  0   4992  49728 134208 529920    0    0     0     0    2   26 100  0  0  0  0
 0  0   4992  49728 134208 529920    0    0     0     0    2   34  0  0  0  0  0
 0  0   4992  49728 134208 529920    0    0     0     6    4   33  0  0  0  0  0