All, One server of mine running CentOS 6.3. The load is very high, but few process in running or blocked. Followed is the output of /proc/stat, /proc/loadavg and top /proc/stat cpu 5351723 61716 6974590 161365578 240734 141769 380525 0 0 cpu0 4016881 9686 2510787 79408769 110721 141549 351075 0 0 cpu1 1334842 52029 4463802 81956808 130013 220 29449 0 0 intr 1081538370 139 8 0 0 0 0 0 0 0 0 0 0 106 0 0 73 0 0 531522246 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3929190 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ctxt 1074666354 btime 1409530629 processes 9684115 procs_running 1 procs_blocked 0 softirq 1418158114 0 367862840 177073 609942882 3679591 0 2 53962455 1790447 380742824 /proc/loadavg 11.21 22.50 10.74 1/2536 16895 Top -H top - 05:08:02 up 10 days, 4:50, 1 user, load average: 13.24, 23.26, 10.86 Tasks: 2535 total, 1 running, 2534 sleeping, 0 stopped, 0 zombie Cpu(s): 3.1%us, 4.0%sy, 0.0%ni, 92.5%id, 0.1%wa, 0.1%hi, 0.2%si, 0.0%st Mem: 3925040k total, 3780944k used, 144096k free, 31464k buffers Swap: 2064376k total, 1196k used, 2063180k free, 3201568k cached Sincerely, Mingfei Hua