[lm-sensors] AMD Phenom II Family 16h

[lm-sensors] AMD Phenom II Family 16h

[Pablo Fabian Wagner Boian]

Hi everyone.
I've got a question regarding AMD Phenom II Family 16h. I'm using the k10temp 
which appear to be the lastest (the stand alone one, downloaded from lm-
sensors.org), and it gives me a temp not matching the real (about -10ºC diff 
between them). And, should it provides me a temp reading for all cores? (6 in 
my case), because I got only one.

Thanks in advance.
----
Pablo Wagner

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Re: [lm-sensors] AMD Phenom II Family 16h

[Guenter Roeck]

On Fri, Sep 23, 2011 at 08:06:19PM -0400, Pablo Fabian Wagner Boian wrote:
> Hi everyone.
> I've got a question regarding AMD Phenom II Family 16h. I'm using the k10temp 
> which appear to be the lastest (the stand alone one, downloaded from lm-
> sensors.org), and it gives me a temp not matching the real (about -10ºC diff 
> between them). And, should it provides me a temp reading for all cores? (6 in 
> my case), because I got only one.
> 
I can not comment on the accuracy, but the k10temp module reads the temperature
from the northbridge, and there is only one no matter how many cores your chip has.
I guess the chip only reports the package temperature, not the per-core temperature.

Having said that ... the driver officially only supports up to family 15h as far
as I can see. Did you patch it, or does it just work ?

Thanks,
Guenter


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Re: [lm-sensors] AMD Phenom II Family 16h

[Phil Pokorny]

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On Fri, Sep 23, 2011 at 8:50 PM, Guenter Roeck
<guenter.roeck@ericsson.com>wrote:

>
> > it gives me a temp not matching the real (about -10ºC diff
> > between them)
>

How are you measuring the "real" temperature?  Do you have a thermocouple
inserted between the CPU and heatsink?

Some time ago, AMD changed the temperature scale to a synthetic "Tcontrol"
scale where the reading 70degC is the maximum operating temperature for the
chip.  This simplifies things because  you don't have to know the
particulars of each chip, you can just manage the "temperature" to keep it
below 70 "degC".

Phil P.

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Re: [lm-sensors] AMD Phenom II Family 16h

[Jean Delvare]

On Fri, 23 Sep 2011 20:50:22 -0700, Guenter Roeck wrote:
> On Fri, Sep 23, 2011 at 08:06:19PM -0400, Pablo Fabian Wagner Boian wrote:
> > Hi everyone.
> > I've got a question regarding AMD Phenom II Family 16h. I'm using the k10temp 
> > which appear to be the lastest (the stand alone one, downloaded from lm-
> > sensors.org), and it gives me a temp not matching the real (about -10ºC diff 
> > between them). And, should it provides me a temp reading for all cores? (6 in 
> > my case), because I got only one.
>
> I can not comment on the accuracy, but the k10temp module reads the temperature
> from the northbridge, and there is only one no matter how many cores your chip has.

The K8 only had a single north bridge PCI device, but it could report
several temperatures per CPU. This is no longer true with the family
10h and later.

As far as accuracy goes, the issue is explained at length in
Documentation/hwmon/k10temp.

> I guess the chip only reports the package temperature, not the per-core temperature.

I think you're right. Which is not bad per se... better one good
temperature value than two good and two bogus as k8temp often does.

> Having said that ... the driver officially only supports up to family 15h as far
> as I can see. Did you patch it, or does it just work ?

The driver supports PCI devices (north bridge) not CPU families. Just
as family 12h and 14h north bridges have the same PCI device ID, I can
only guess that family 15h and 16h north bridges have the same PCI
device ID. If this is confirmed, we can update the driver documentation
accordingly. Andre, Clemens, any comment on this?

-- 
Jean Delvare

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Re: [lm-sensors] AMD Phenom II Family 16h

[Clemens Ladisch]

Jean Delvare wrote:
> On Fri, 23 Sep 2011 20:50:22 -0700, Guenter Roeck wrote:
>> On Fri, Sep 23, 2011 at 08:06:19PM -0400, Pablo Fabian Wagner Boian wrote:
>>> I've got a question regarding AMD Phenom II Family 16h.
>>
>> ... the driver officially only supports up to family 15h as far
>> as I can see. Did you patch it, or does it just work ?
>
> The driver supports PCI devices (north bridge) not CPU families. Just
> as family 12h and 14h north bridges have the same PCI device ID, I can
> only guess that family 15h and 16h north bridges have the same PCI
> device ID. If this is confirmed, we can update the driver documentation
> accordingly. Andre, Clemens, any comment on this?

Phenom IIs are always Family 10h.
I'd guess this is decimal/hex confusion and not a super-secret new CPU.


Regards,
Clemens

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Re: [lm-sensors] AMD Phenom II Family 16h

[Guenter Roeck]

On Sat, Sep 24, 2011 at 05:28:58PM -0400, Clemens Ladisch wrote:
> Jean Delvare wrote:
> > On Fri, 23 Sep 2011 20:50:22 -0700, Guenter Roeck wrote:
> >> On Fri, Sep 23, 2011 at 08:06:19PM -0400, Pablo Fabian Wagner Boian wrote:
> >>> I've got a question regarding AMD Phenom II Family 16h.
> >>
> >> ... the driver officially only supports up to family 15h as far
> >> as I can see. Did you patch it, or does it just work ?
> >
> > The driver supports PCI devices (north bridge) not CPU families. Just
> > as family 12h and 14h north bridges have the same PCI device ID, I can
> > only guess that family 15h and 16h north bridges have the same PCI
> > device ID. If this is confirmed, we can update the driver documentation
> > accordingly. Andre, Clemens, any comment on this?
> 
> Phenom IIs are always Family 10h.
> I'd guess this is decimal/hex confusion and not a super-secret new CPU.
> 
That might explain why I did not find any information about it ;).

Guenter

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Re: [lm-sensors] AMD Phenom II Family 16h

[Andre Przywara]

On 09/24/2011 11:28 PM, Clemens Ladisch wrote:
> Jean Delvare wrote:
>> On Fri, 23 Sep 2011 20:50:22 -0700, Guenter Roeck wrote:
>>> On Fri, Sep 23, 2011 at 08:06:19PM -0400, Pablo Fabian Wagner Boian wrote:
>>>> I've got a question regarding AMD Phenom II Family 16h.
>>>
>>> ... the driver officially only supports up to family 15h as far
>>> as I can see. Did you patch it, or does it just work ?
>>
>> The driver supports PCI devices (north bridge) not CPU families. Just
>> as family 12h and 14h north bridges have the same PCI device ID, I can
>> only guess that family 15h and 16h north bridges have the same PCI
>> device ID. If this is confirmed, we can update the driver documentation
>> accordingly. Andre, Clemens, any comment on this?

In fact the northbridges are quite different, only the temperature 
reporting part has been kept the same. So for the purpose of this driver 
(and only in this case) we can handle the northbridges as if they were 
compatible. But in fact the PCI-IDs changed, so we have to list them 
(and add them if new CPUs are released). But yes, Llano and Brazos 
(Fam12h and Fam14h) share the same northbridge, hence the same PCI-ID.

Regards,
Andre.

>
> Phenom IIs are always Family 10h.
> I'd guess this is decimal/hex confusion and not a super-secret new CPU.

That is true. I await more of this confusion when Fam 15h (aka 
Bulldozer) hits the market, since people may mix it up with family 15 
(0Fh) aka K8 ;-)

Regards,
Andre.

-- 
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12
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