Hi!

 

my nextcloud instance on an odroid hc2 running armbian has been running stable and smoothly for several months now. Thanks Igor and the whole armbian team!

 

I have one question though:

 

Task: I convert videos with ffmpeg to reduce file size and optimize them for streaming

 

observed behaviour: the CPU is getting very hot! In the evening up to 100 °C (see below), but at noon I have seen temperatures of up to 115 °C! I read somewhere that 110 °C is the critical temperature for the board and the stock hardkernel image has an emergency shutdown implemented. But my board running armbian seems to be negligent of this. On a side note, the CPU frequency reported in armbianmonitor -m is 1800/1300, in htop all 8 cores show 1300 ( .LITTLE)?

 

expected behaviour: shouldn't the CPU be throttled automatically?

 

excerpts from armbianmonitor -m:
 

Stop monitoring using [ctrl]-[c]
Time       big.LITTLE   load %cpu %sys %usr %nice %io %irq   CPU  C.St.

17:56:51: 1800/1300MHz  2.20   2%   0%   0%   1%   0%   0% 84.0°C  2/13
17:56:57: 1800/1300MHz  2.99  93%   0%  17%  75%   0%   0% 87.0°C  2/13
17:57:02: 1800/1300MHz  3.79  93%   0%  18%  74%   0%   0% 89.0°C  2/13
17:57:07: 1800/1300MHz  3.89  82%   0%  13%  68%   0%   0% 84.0°C  2/13
17:57:12: 1800/1300MHz  3.74  80%   0%  18%  60%   0%   0% 85.0°C  2/13

...

17:59:19: 1800/1300MHz  9.83  90%   0%  16%  73%   0%   0% 98.0°C  2/13
17:59:25: 1800/1300MHz 10.38  95%   0%  15%  79%   0%   0% 99.0°C  2/13
Time       big.LITTLE   load %cpu %sys %usr %nice %io %irq   CPU  C.St.
17:59:30: 1800/1300MHz 10.27  94%   1%  22%  70%   0%   0% 100.0°C  2/13
17:59:36: 1800/1300MHz  9.85  90%   0%  16%  72%   0%   0% 99.0°C  2/13
17:59:42: 1800/1300MHz 10.10  95%   0%  17%  77%   0%   0% 100.0°C  2/13
17:59:48: 1800/1300MHz 10.33  98%   0%  18%  79%   0%   0% 102.0°C  2/13
17:59:54: 1800/1300MHz 10.38  95%   0%  22%  71%   0%   0% 101.0°C  2/13
18:00:00: 1800/1300MHz 10.79  97%   1%  20%  75%   0%   0% 100.0°C  2/13

 

 

My HC1, after exceeding 110, just went out. I'd rather avoid going over 100. With a well-matched kernel has 1500 and 2000 on the BIG.
When all the cores are working intensively, samsung heats up very quickly and is just reaching those 90-100C. Much depends on the ambient temperature and HDD / SSD.
This passive cpu cooling is very inefficient. If you often have a large load, think about a fan.
Also make sure you have scaling_governor on demand.
Mine in the area over 60 starts to go down to 1400/1900 - 1300/1800 and so on ...

You can also check if the cpu touches the surface well, or replace the thermo pad.