The Linux core temperature measurements are off because Linux assumes a Tjmax
of 100°C. However, you may fix this with the following line in your
/etc/modules file:
coretemp tjmax=90
After rebooting, you'll see the following in dmesg:
[ 11.133681] coretemp coretemp.0: Unable to read TjMax from CPU 0
[ 11.133708] coretemp coretemp.0: TjMax forced to 90 degrees C by user
At the moment, my net6501 is sitting at 49.0°C (per the "sensors" command).
-Peter
On Jan 19, 2012, at 9:59 AM, Soren Kristensen wrote:
> Hi Are,
>
> Are Tysland wrote:
>> Hi!
>>
>> Just thought I'd share my temperature observations on a net6501-70 with
>> fresh install of Debian Testing (Wheezy).
>> Samples are taken with lm-sensors. Kernel is 3.1.0-1-amd64.
>> Ambient temperature varies between 23°C and 24°C.
>> No internal hard drive mounted yet.
>> All numbers are taken at least 2 hours after the values has stabilised.
>>
>> Placed flat on a table:
>> When idle: 83°C
>> With a load at ~4: 86°C
>>
>> Placed horizontally raised 10cm from table surface:
>> When idle: 80°C
>> With a load at ~4: 83°C
>>
>> Placed vertically with holes on both sides free:
>> When idle: 75°C
>> With a load at ~5: 78°C
>>
>>
>> I'm not sure the values are correct as I have no way of confirming
>> them, but I find the differences interesting.
>
> Current lm-sersors don't seems to be correct on a net6501. You can use
> the builtin digital sensor on the Atom chip, in an earlier post:
>
> According to the Intel docs, the commercial Atom E6xx parts we use have
> a Tjmax of 90°C, with an onchip precision digital thermal sensor that
> will shut down the chip if the Tjmax is exceeded.
>
> The die temperature is readable using RDMSR reg 019C bits 16..22, as an
> offset from Tjmax, can be done in the comBIOS monitor by:
>
>> rm 19c
>
> If it t.ex. shows 00000000 88240000 then the offset is the 24 (hex),
> which gives 90 - 36 = 54°C
>
> Our testing shows net6501-70 processpr temperature about 32 deg celcius
> above ambient when in the standard case flat on a table.
>
>
> Best Regards,
>
>
> Soren Kristensen
>
> CEO & Chief Engineer
> Soekris Engineering, Inc.
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