cpu usage

top - 01:04:11 up 28 days, 21:56,  1 user,  load average: 0.01, 0.00, 0.00
Tasks:  31 total,   1 running,  30 sleeping,   0 stopped,   0 zombie
Cpu(s):  7.6%us,  1.5%sy, 90.9%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:   1048576k total,   147108k used,   901468k free,        0k buffers
Swap:  4194304k total,        0k used,  4194304k free,    91040k cached