linux-kernel - Re: [lm-sensors] [PATCH 0/2] hwmon: Update coretemp to current Intel processors

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Date:	Wed, 19 May 2010 09:27:00 +0800
From:	Huaxu Wan <huaxu.wan@...ux.intel.com>
To:	Carsten Emde <C.Emde@...dl.org>
Cc:	Dmitry Gromov <gromovd@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LM Sensors <lm-sensors@...sensors.org>,
	Huaxu Wan <huaxu.wan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [lm-sensors] [PATCH 0/2] hwmon: Update coretemp to current
 Intel processors

On 09:01 Tue 18 May, Carsten Emde wrote:
> Dmitry,
> 
> >>Here comes the current version of the coretemp patches. Huaxu did the
> >>initial work; Jean suggested to submit them directly to Andrew.
> >>
> >>I made some style changes as advised by checkpatch.
> >>
> >>The patches have been tested successfully on Core 2 Duo and Quad, and on
> >>Nehalem and Nehalem/Westmere where temperature readings were plausible and
> >>changed with load as expected. When tested on an Atom processor (N270), the
> >>temperature values were identical to previous versions of the coretemp
> >>module and also changed with load. However, the readings should be higher
> >>by 10 to 15C as compared to the outside temperature of the processor.
> >>Huaxu, could you check? I would guess TjMax to be 105 instead of 90C in these
> >>processors.
> >I apologize, if I ask a stupid question, but are you saying that TjMax in
> >coretemp.c should be set to higher value than Tcase-max value specified in
> >Intel documents?
> Hmm, no. I am saying that I would like the reading to be correct. I
> have measured the outside temperature of the case with an infrared
> thermometer [1] and found it to be higher than the readings returned
> by the coretemp module. In all other CPUs I have, the coretemp
> readings are higher than the case temperature.
> 
> [1] http://www.osadl.org/uploads/media/IPCworld-2008-4.pdf
> 

Hi Carsten,

I have no N270 and infrared thermometer in hand, so I can't check it by myself.
I'll find a channel and file this issue to them. 

Thank you.


Huaxu
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