[PVE-User] native container strange cpu usage behaviour

Leandro Roggerone leandro at tecnetmza.com.ar
Fri May 7 14:49:59 CEST 2021


Hi guys.
I was running unbound dns on native proxmox container.
It is being monitored by librenms.
After some time running without any problem following happened.
First begin receiving snmp notifications regarding "high cpu/core
temperature"
(temperature was ok when checking at proxmox cli using sensor command)
Then I noticed that cpu is at %100 all time on lnms cpu graphs.
SO...
I take out dns queries , stoped unbound and rebooted container , then after
reboot, I have following top output.

top - 12:46:02 up 52 min,  1 user,  load average:* 7.93, *5.49, 5.60
Tasks:  15 total,   1 running,  14 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,
 0.0 st
KiB Mem :  8388608 total,  8141576 free,    39164 used,   207868 buff/cache
KiB Swap:  8388604 total,  8388604 free,        0 used.  8349444 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
    1 root      20   0   43316   5052   3912 S   0.0  0.1   0:00.13 systemd
   39 root      20   0   39092   6660   6372 S   0.0  0.1   0:00.03
systemd-journal
   51 root      20   0   41536   3132   2740 S   0.0  0.0   0:00.01
systemd-udevd
   57 dbus      20   0   58136   4200   3720 S   0.0  0.1   0:00.01
dbus-daemon
   58 root      20   0   26392   2928   2656 S   0.0  0.0   0:00.01
systemd-logind
   65 root      20   0    6524   1712   1588 S   0.0  0.0   0:00.00 agetty
   68 root      20   0    6524   1640   1520 S   0.0  0.0   0:00.00 agetty
   69 root      20   0    6524   1612   1488 S   0.0  0.0   0:00.00 agetty
   70 root      20   0   22708   2636   2012 S   0.0  0.0   0:00.00 crond
  273 root      20   0  112932   7688   6656 S   0.0  0.1   0:00.01 sshd
  275 root      20   0  218560   4996   4180 S   0.0  0.1   0:00.16 rsyslogd
  276 root      20   0  124696  15860  10952 S   0.0  0.2   0:01.47 snmpd
  291 root      20   0  155340  10596   9240 S   0.0  0.1   0:00.18 sshd
  293 root      20   0   11944   3072   2596 S   0.0  0.0   0:00.06 bash
  490 root      20   0   56216   3944   3352 R   0.0  0.0   0:00.00 top


So ... Question is , why load average is so high if there is no processes
consuming cpu.
Any idea / feedback about this?
Thanks.

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