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If it's fanless, is it thermal throttling?
It’s fanless! How can I check for thermal throttling? Is that a bios setting?
Thermal throttling is when the system (usually the cpu) becomes so hot from the lack of cooling provided to it, that it limits its performance to save itself from certain death - going so far as performing a hard shutdown if the situation doesn't improve or stabilize. AMD chips usually throttle at 80C, Intel chips 100C, but it could be a few different components. You need to run software that can properly read and report the temperature of various parts in your system to see if you might be hitting the throttling threshold.
I know software to do this for windows, but not any for *nix.
I installed a thing called lm-sensors on debian and it shows me this during a time when the box is struggling -
Every 1.0s: sensors
coretemp-isa-0000 Adapter: ISA adapter Package id 0: +44.0°C (high = +105.0°C, crit = +105.0°C) Core 0: +38.0°C (high = +105.0°C, crit = +105.0°C) Core 1: +39.0°C (high = +105.0°C, crit = +105.0°C) Core 2: +39.0°C (high = +105.0°C, crit = +105.0°C) Core 3: +39.0°C (high = +105.0°C, crit = +105.0°C)
acpitz-acpi-0 Adapter: ACPI interface temp1: +0.0°C (crit = +119.0°C)
Seems to be working fine.
Unless the thermal throttling limits are set by the BIOS and I'll have to go looking into that by rebooting?
Resources also seemed ok - RAM was 2 GB used out of 16 and all the cores were at 10-15% usage, according to htop.
Yeah, that all looks okay. Did you put the system under heavy load while checking/monitoring?
I was just trying to open my transmission dashboard! 😄
Have the system do something intensive and see how much the temps climb. Let it work for a few minutes and see - that will tell you if your system is thermal throttling or not.