12:06:34 up 15 days, 50 min, 9 users, load average: 2.22, 2.14, 2.09
138 processes: 137 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 2.0% user 42.0% system 0.0% nice 0.0% iowait 54.0% idle
CPU1 states: 1.0% user 0.0% system 0.0% nice 0.0% iowait 98.0% idle
Mem: 1030100k av, 1019872k used, 10228k free, 0k shrd, 274892k buff
642268k actv, 0k in_d, 22380k in_c
Swap: 6144852k av, 55912k used, 6088940k free 568100k cached


12:06:54 up 15 days, 50 min, 9 users, load average: 2.01, 2.09, 2.07
134 processes: 132 sleeping, 2 running, 0 zombie, 0 stopped
CPU0 states: 2.6% user 84.0% system 0.0% nice 0.0% iowait 13.3% idle
CPU1 states: 1.6% user 2.5% system 0.0% nice 0.0% iowait 95.8% idle
Mem: 1030100k av, 1017892k used, 12208k free, 0k shrd, 274892k buff
640820k actv, 0k in_d, 21596k in_c
Swap: 6144852k av, 55908k used, 6088944k free 566620k cached


12:08:15 up 15 days, 51 min, 9 users, load average: 1.44, 1.89, 2.00
134 processes: 133 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 4.4% user 65.4% system 0.0% nice 0.0% iowait 30.0% idle
CPU1 states: 1.3% user 1.4% system 0.0% nice 0.0% iowait 97.1% idle
Mem: 1030100k av, 1020424k used, 9676k free, 0k shrd, 274892k buff
645636k actv, 0k in_d, 21088k in_c
Swap: 6144852k av, 55912k used, 6088940k free 569548k cached

恢复正常：
12:08:35 up 15 days, 52 min, 9 users, load average: 1.10, 1.78, 1.96
134 processes: 133 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 2.3% user 0.9% system 0.0% nice 0.0% iowait 96.7% idle
CPU1 states: 0.2% user 0.3% system 0.0% nice 0.0% iowait 99.5% idle
Mem: 1030100k av, 1020416k used, 9684k free, 0k shrd, 274892k buff
645500k actv, 0k in_d, 21104k in_c
Swap: 6144852k av, 55912k used, 6088940k free 569020k cached


12:08:55 up 15 days, 52 min, 9 users, load average: 0.78, 1.67, 1.92
134 processes: 133 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 0.5% user 0.5% system 0.0% nice 0.0% iowait 99.0% idle
CPU1 states: 0.3% user 0.7% system 0.0% nice 0.0% iowait 99.0% idle
Mem: 1030100k av, 1020416k used, 9684k free, 0k shrd, 274892k buff
645500k actv, 0k in_d, 21104k in_c
Swap: 6144852k av, 55912k used, 6088940k free 569020k cached


上午发现过一次，现在又出现了。。。。