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CPU temperature reading

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Janos Dohanics

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Jul 17, 2014, 1:54:58 PM7/17/14
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Hello,

I am getting impossibly low temperature readings on a new system
running FreeBSD 10.0-STABLE #0 r268555 amd64:

# sysctl -a | grep amdtemp
dev.amdtemp.%parent:
dev.amdtemp.0.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.0.%driver: amdtemp
dev.amdtemp.0.%location:
dev.amdtemp.0.%pnpinfo:
dev.amdtemp.0.%parent: hostb4
dev.amdtemp.0.sensor_offset: 0
dev.amdtemp.0.core0.sensor0: 17.2C
dev.amdtemp.1.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.1.%driver: amdtemp
dev.amdtemp.1.%location:
dev.amdtemp.1.%pnpinfo:
dev.amdtemp.1.%parent: hostb10
dev.amdtemp.1.sensor_offset: 0
dev.amdtemp.1.core0.sensor0: 19.1C

The BIOS only says CPU temp "Low".

Smartctl shows 30C for hard drive temperatures. The ambient temp in the
room is about 24C - defective CPU thermal sensors?

--
Janos Dohanics
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Antoine Kallab

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Jul 17, 2014, 2:19:44 PM7/17/14
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On Thu, Jul 17, 2014 at 1:54 PM, Janos Dohanics <w...@3dresearch.com> wrote:

> Hello,
>
> I am getting impossibly low temperature readings on a new system
> running FreeBSD 10.0-STABLE #0 r268555 amd64:
>
> # sysctl -a | grep amdtemp
> dev.amdtemp.%parent:
> dev.amdtemp.0.%desc: AMD CPU On-Die Thermal Sensors
> dev.amdtemp.0.%driver: amdtemp
> dev.amdtemp.0.%location:
> dev.amdtemp.0.%pnpinfo:
> dev.amdtemp.0.%parent: hostb4
> dev.amdtemp.0.sensor_offset: 0
> dev.amdtemp.0.core0.sensor0: 17.2C
> dev.amdtemp.1.%desc: AMD CPU On-Die Thermal Sensors
> dev.amdtemp.1.%driver: amdtemp
> dev.amdtemp.1.%location:
> dev.amdtemp.1.%pnpinfo:
> dev.amdtemp.1.%parent: hostb10
> dev.amdtemp.1.sensor_offset: 0
> dev.amdtemp.1.core0.sensor0: 19.1C
>
> The BIOS only says CPU temp "Low".
>
> Smartctl shows 30C for hard drive temperatures. The ambient temp in the
> room is about 24C - defective CPU thermal sensors?
>
Most likely.

Here's a temporary fix:

Have you ever recorded your CPU temperature and load before?

If so, compare the load averages with then and now, and set the sensor
offset, so the readings match the temperatures.

Janos Dohanics

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Jul 18, 2014, 5:53:37 AM7/18/14
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I'm not sure I understand your fix: I'd monitor temps at idle and under
load, and record (false) readings in both states?

--
Janos Dohanics
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