Hello,

 

I'm running Armbian on the original (LeMaker) A20 powered BananaPI :

 cat /etc/issue
Armbian 21.08.6 Buster \l 

 

I did an apt-get upgrade few days back, and since, it's CPU load is always around 1.00 even if I don't run my custom application (obviously, it wasn't the case before).

Nothing special in /var/logs/messages, but top show me a kernel process always on top :

top - 15:03:43 up 1 day, 17:40,  1 user,  load average: 0,98, 1,03, 1,12
Tasks: 112 total,   2 running, 110 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4,5 us,  6,3 sy,  0,0 ni, 89,0 id,  0,0 wa,  0,0 hi,  0,2 si,  0,0 st
MiB Mem :    993,9 total,    583,3 free,    119,7 used,    291,0 buff/cache
MiB Swap:    497,0 total,    497,0 free,      0,0 used.    840,4 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                        
26647 root      20   0       0      0      0 R  10,3   0,0   1:44.71 kworker/1:0+events_freezable_power_            
32375 laurent   20   0  103912  51264   5472 S  10,3   5,0   1:20.54 Selene                                         
 3664 laurent   20   0    7588   2372   2016 R   0,7   0,2   0:01.23 top                                            
   14 root      20   0       0      0      0 I   0,3   0,0   2:55.81 rcu_sched                                      
 1927 root      20   0    1408    336    292 S   0,3   0,0  10:37.20 BananaLEDd                                     
31455 root      20   0       0      0      0 I   0,3   0,0   0:00.26 kworker/1:3-mm_percpu_wq        

 

I did some googling but it doesn't help to find out what is this events_freezable_power_

 

In another hand, it doesn't explain this 1.00 load as you can see it consums only 10 to 15% of the CPU as well as my own custom application.

 

So any tip, help, whatever is welcome.

 

Thanks

not sure if it is related, but there was something similar in the past - see:

 

This happened several times over the past years across almost all SoCs. Personally I discovered this first on the OPi1+ with H6 SoC and vendor images. Now I notice this on RK3588 when using 5.10.160 (rk4.1 branch and up)  kernel...

Thanks for links.

 

I'm not concerned by AR-305 as I have an HDMI attached (It's my home automation dashboard, images you can see on my Twitter profile). But i don't have a SATA disk on this machine.

 

The only google hits I found about this issue is related to disk access : as the only one I have is the SD card, I'm a bit fearing about its duration. But nothing is clear about this particular kworker : what is its goal ?