Temperature reporting

[GregoryO]

Hi,

The question is about how pfSense/freebsd is reporting CPU temperature.
For example in the GUI I see for each core like 52.0C .

it perfectly matches what sysctl is producing:
sysctl -a | grep temperature
hw.acpi.thermal.tz1.temperature: 29.9C
hw.acpi.thermal.tz0.temperature: 27.9C
dev.cpu.3.temperature: 53.0C
dev.cpu.2.temperature: 53.0C
dev.cpu.1.temperature: 52.0C
dev.cpu.0.temperature: 52.0C

but the question is why this is giving different result:
sysctl -n dev.cpu.0.temperature
47.0C

47 vs 52 ? Completely normal phenonemon ?

BR,
Gregory

[jimp]

The ACPI thermal zones are likely not on the CPU die like the dev.cpu ones are. They are probably other chipsets or ambient case temps. Check your board/BIOS docs.

[GregoryO]

@jimp said in Temperature reporting:

The ACPI thermal zones are likely not on the CPU die like the

But Jim,
those are literally same sysctl keys,
dev.cpu.0.temperature: 52.0C
vs
47.0C

Just one is taken via grep, and one directly via -n key

That I dont understnand. If the sysctl keys could be different then agree.

[jimp]

Then the temp must be different at those times.

sysctl -a can generate a little extra load since it's generating and outputting the entire sysctl oid tree.

Whereas sysctl -n <oid> is only querying a single OID.

[jimp]

I tried it on a test box here and it's the same.

: sysctl -a | grep 'dev.cpu.0.temperature'
dev.cpu.0.temperature: 25.0C
: sysctl -n dev.cpu.0.temperature
25.0C

[NollipfSense]

@jimp Tried that also and got 63 for both.