I have a system with CPU @ 100% and load average 25. top command shows 99% wait time for cpu
top - 14:59:13 up 19 days, 4:27, 2 users, load average: 25.10, 25.06, 25.01
Tasks: 180 total, 1 running, 179 sleeping, 0 stopped, 0 zombie
Cpu0 : 5.0%us, 1.4%sy, 0.0%ni, 0.0%id, 93.6%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.3%us, 0.0%sy, 0.0%ni, 0.0%id, 99.7%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 3.7%us, 0.3%sy, 0.0%ni, 0.0%id, 96.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id,100.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3878060k total, 3734868k used, 143192k free, 894436k buffers
Swap: 0k total, 0k used, 0k free, 1911524k cached
ps auxf shows that it is in stat D uninterruptible sleep
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
asterisk 48113 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48115 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48138 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48140 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48143 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48145 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48148 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48150 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48154 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48165 0.0 0.0 12 8 ? D May24 0:00 _ [sh]
asterisk 48193 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48196 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48198 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48200 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48203 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48226 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48228 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48231 0.0 0.0 12 8 ? D May24 0:00 _ [parkfetch.agi]
asterisk 48255 0.0 0.0 12 8 ? D May24 0:00 _ [dialparties.agi]
I set a lab system with call parking but parkfetch.agi doesn’t appear in the processes list.