[lm-sensors] Intel Atom thermal sensors

Dmitry Gromov gromovd at gmail.com
Tue May 11 17:48:06 CEST 2010

Hi, Jean!

On Tue, May 11, 2010 at 10:42, Jean Delvare <khali at linux-fr.org> wrote:
> Hi Dmitry,
> On Tue, 11 May 2010 09:44:49 -0400, Dmitry Gromov wrote:
>> Hi!
>> Well, if anyone is interested. I successfully installed Ubuntu Server 10.04:
>> Linux dgwind1 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:09:38 UTC
>> 2010 x86_64 GNU/Linux
>> I re-run sensors-detect hoping it would fix configuration and allow
>> Intel Atom sensors to be reported.
>> It did detect those sensors... but failed to add coretemp driver to /etc/modules
>> Once I loaded coretemp driver, I was able to see 4 outputs of Atom
>> temperature sensors - this is dual core N330 CPU, with hyperthreading.
>> What is interesting though is that it seems like probe of one core
>> reported as Core 0 and 2 and probe of the second core is reported as
>> Core 1 and 3
> This is my experience as well. And I think this is incorrect. I'm
> almost certain that there's only one thermal sensor per core, so
> hyperthreaded cores should only be listed once. I have a patch fixing
> this see, below if you want to give it a try.

Thank you for the conformation and patch - it is very tempting to try.
If I have some time over weekend, I'll see what I can do.

>> - I thought, they'd be reported sequentially.
> This is due to the way the kernel enumerates the CPUs. As I understand
> it, it enumerates all cores first, and only then the hyperthreaded
> siblings.

I see, thank you for an explanation.


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