troubleshooting Question

High load average on Linux Server running asterisk Question

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we are running CentOS ans Asterisk on Dual Proc 3.0 GHZ machine , we are currently experiencing system slow downs. Is this cause of High Load average?

top - 10:26:58 up 20:55,  5 users,  load average: 21.88, 17.62, 15.70
Tasks: 112 total,   3 running, 109 sleeping,   0 stopped,   0 zombie
Cpu0  :  7.9% us, 27.8% sy,  0.0% ni, 21.2% id,  0.3% wa,  5.6% hi, 37.1% si
Cpu1  : 25.2% us, 50.2% sy,  0.0% ni, 15.9% id,  4.7% wa,  0.0% hi,  4.0% si
Cpu2  : 23.8% us, 51.5% sy,  0.0% ni, 15.5% id,  5.6% wa,  0.0% hi,  3.6% si
Cpu3  : 25.6% us, 51.5% sy,  0.0% ni, 13.3% id,  7.3% wa,  0.0% hi,  2.3% si
Mem:   4150376k total,  4098092k used,    52284k free,    38780k buffers
Swap:  2031608k total,      144k used,  2031464k free,  3878640k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2410 root      15   0     0    0    0 S 22.9  0.0  28:00.12 nfsd
 2414 root      15   0     0    0    0 S 18.3  0.0  25:21.99 nfsd
 2236 root      16   0  133m  58m 5180 R  5.3  1.5   9:29.85 asterisk
16479 root      16   0  4088 2480  704 S  2.7  0.1   0:17.84 mtr
32571 root      16   0  4736 2480  700 R  2.3  0.1   1:00.57 mtr
18208 root      16   0  3556  968  756 S  0.7  0.0   0:02.54 top
    8 root      RT   0     0    0    0 S  0.3  0.0   0:00.78 migration/3
  238 root      15   0     0    0    0 S  0.3  0.0   1:03.68 kjournald
 7693 root      16   0  2500  968  756 S  0.3  0.0   0:11.39 top
24805 root      16   0     0    0    0 S  0.3  0.0   0:03.79 pdflush
15902 errien    15   0  7404 2208 1800 S  0.3  0.1   0:02.09 sshd
 4751 root      17   0  2772  972  756 R  0.3  0.0   0:00.12 top
    1 root      16   0  3324  560  480 S  0.0  0.0   0:01.14 init
    2 root      RT   0     0    0    0 S  0.0  0.0   0:02.67 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:06.18 ksoftirqd/0
    4 root      RT   0     0    0    0 S  0.0  0.0   0:00.82 migration/1
    5 root      34  19     0    0    0 S  0.0  0.0   0:00.13 ksoftirqd/1
    6 root      RT   0     0    0    0 S  0.0  0.0   0:01.39 migration/2
    7 root      34  19     0    0    0 S  0.0  0.0   0:00.54 ksoftirqd/2
    9 root      34  19     0    0    0 S  0.0  0.0   0:00.72 ksoftirqd/3
   10 root       5 -10     0    0    0 S  0.0  0.0   0:00.45 events/0
   11 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 events/1
   12 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 events/2
   13 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 events/3
   14 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 khelper
   15 root      15 -10     0    0    0 S  0.0  0.0   0:00.00 kacpid
   48 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 kblockd/0
   49 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 kblockd/1
   50 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 kblockd/2
   51 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 kblockd/3
   64 root      12 -10     0    0    0 S  0.0  0.0   0:00.00 aio/0
   65 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 aio/1
   66 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 aio/2
   67 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 aio/3
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