Core temperature

[Pietro Cerutti]

Dag-Erling Smørgrav wrote:
> Pietro Cerutti <gahr at gahr.ch> writes:
>> Could you please try to explain these results?
>>
>> % sysctl hw.coretemp.tjmax hw.coretemp.delta hw.acpi.thermal.tz0.temperature
>> hw.coretemp.tjmax: 100
>> hw.coretemp.delta: -38
>> hw.acpi.thermal.tz0.temperature: 66.8C
>>
>> Shouldn't hw.coretemp.delta be (hw.coretemp.tjmax -
>> hw.acpi.thermal.tz0.temperature)?
> 
> The value reported by hw.acpi.thermal.tz0.temperature most likely comes
> from a temperature sensor mounted somewhere on the motherboard, while
> hw.coretemp.delta reports the temperature inside the CPU itself.  In my
> experience, Core-based CPUs run very cool under light load, so the
> result does not surprise me.
> 
> here's what coretemp reports on my file server:
> 
> hw.coretemp.tjmax: 100
> hw.coretemp.delta: -46
> 
> although I believe this is actually one of the CPUs that have an 85°C
> Tj(max), giving a core temperature of 39°C and not 54°C (the box has a
> 2.4 GHz C2D but spends most of its time barely ticking over at 200 MHz)
> 

Thanks for clearing it!

Regards,

> DES


-- 
Pietro Cerutti

PGP Public Key:
http://gahr.ch/pgp

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 187 bytes
Desc: OpenPGP digital signature
Url : http://lists.freebsd.org/pipermail/freebsd-hackers/attachments/20070810/5028b6e3/signature.pgp