Re: [lm-sensors] Coretemp goes up since 2.6.31.4

[dienet <dienet@poczta.fm>]

On Fri, 09 Apr 2010 11:17:33 +0200, Jean Delvare <khali@linux-fr.org>
wrote:

> On Thu, 08 Apr 2010 18:36:34 +0200, dienet wrote:
>> I was using 2.6.31.4 for quite some time - it works OK.
>> Command 'sensor' that gives me temperature on my C2D, was saying that
>> cores have around 28-45 deg (min and maxs on normal day work)
>> Now on 2.6.33.1 sensors gives temperatures around 32-48 deg. I never  
>> seen
>> 29 or below. No room temperature is changing (got two kernels installed,
>> so I can change it quickly)
>> Who is telling the truth here? Was there any works on coretemp module
>> since 2.6.31.4 that made the change in read-out?
>
> There were some changes to the coretemp driver in 2.6.32 and 2.6.33,
> but these shouldn't affect older CPU models and would also not change
> the readout by a few degrees. You can check if the high temperature
> limit is the same - then you can assume the driver changes did not
> affect your system.

On 2.6.31.4:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +33.0°C  (high = +100.0°C, crit = +100.0°C)

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +33.0°C  (high = +100.0°C, crit = +100.0°C)

On 2.6.33.1:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +34.0°C  (high = +105.0°C, crit = +105.0°C)

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +34.0°C  (high = +105.0°C, crit = +105.0°C)

So there is a 5 deg diffrance. I did not change any config files.

>> I think that because that temp. change fan is working more often.
>>
>> I'm using Lenovo ThinkPad T61.
>
> This suggests that the temperature increase is real and this isn't just
> a reporting issue. I suggest that you check
> in /proc/acpi/processor/*/power, the amount of time spent in C2 and C3
> states. Also install powertop and run it on both kernels, see if 2.6.33
> has more frequent wake-ups than 2.6.31.

On 2.6.31.4 powertop says:

C3 - 90, 7% of the time
P (800MHz) - 98%
Wakeups: 627

On 2.6.33.1 powertop says:

C3 - 93% of the time
P (800MHz) - 98%
Wakeups: 556

Was running the same programs. Kernel 2.6.33.1 was running for about 1h.

I'm asuming that /proc/acpi/processor/*/power is used by powertop so I'm
not paseting it. But it also says that C3 is more often used then others.

-- 
pozdr0
dienet

"Old C programmers never die. They're just cast into void."

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