[PVE-User] native container strange cpu usage behaviour

Denis PUGNERE d.pugnere at ipnl.in2p3.fr
Fri May 7 15:32:42 CEST 2021


Buenos dias Leandeo,

May be look at I/O errors, bad sectors on storage generate I/O wait on CPU without any processor activity.
or another source : NFS server not responding.

Cheers,
Denis

----- Le 7 Mai 21, à 14:49, Leandro Roggerone leandro at tecnetmza.com.ar a écrit :

> 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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