sys time oddity

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0    272   7626    224   1703    0    0    92    12  428  545 19 17  0 64  0
 0  0    272   7625    224   1703    0    0    28    32  400  540 42 24  0 33  0
 0  0    272   7627    224   1704    0    0    20     8  403  537 28 20  0 52  0

top - 05:26:15 up 416 days, 13:08,  2 users,  load average: 0.79, 0.75, 0.72
Tasks: 123 total,   1 running, 122 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.8%us,  0.4%sy,  0.0%ni, 98.1%id,  0.7%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  16467904k total,  9205872k used,  7262032k free,   221808k buffers
Swap:  2097148k total,   265688k used,  1831460k free,  1849804k cached