CPU temp's on core 2 duo, should they be significantly different?

[Frank Shute]

On Mon, Jun 23, 2008 at 01:52:07PM -0700, George Hartzell wrote:
>
> Josh Carroll writes:
>  > [...]
>  > I'd recommend taking the heat sink off and seeing how the thermal
>  > grease is spread on the CPU's head spreader and on the heatsink
>  > itself. If it looks lopsided or extremely thick on one side of the CPU
>  > package or extremely thin (to the point where you can still see the
>  > sheen of the heatsink or heat spreader), then re-mount the heatsink
>  > and try to make sure it's evenly distributing the pressure down on the
>  > CPU package.
> 
> This is a Shuttle XPC box.  I pulled the heatsink/cooler assembly and
> there didn't seem to be any obvious asymmetries in how the the grease
> was distributed.  I swirled it around a bit, reassembled, and am
> seeing the same kind of spreads.
> 
> Here's the machine pretty much idle 
> 
>   dev.cpu.0.temperature: 44
>   dev.cpu.1.temperature: 28
> 
> Where top says:
> 
>   last pid:  1217;  load averages:  0.02,  0.51,  0.43            up 0+00:14:57  13:49:47
>   52 processes:  1 running, 51 sleeping
>   CPU:  0.0% user,  0.0% nice,  0.0% system,  0.2% interrupt, 99.8% idle
>   Mem: 22M Active, 13M Inact, 95M Wired, 1788K Cache, 15M Buf, 3797M Free
>   Swap: 4063M Total, 4063M Free

My top on 7.0 says "CPU states:" not "CPU:"

Are you sure you're running on 2 cores?

dmesg will tell you and top will have a "C" column with 0 or 1 in it.

If you're running on one core, it will explain the temperature
discrepancy.

> 
> A could of dd if=/dev/urandom etc... quickly pushes it up, but the
> delta remains:
> 
>   dev.cpu.0.temperature: 51
>   dev.cpu.1.temperature: 39
> 
> Top says:
> 
>   last pid:  1243;  load averages:  0.98,  0.65,  0.48            up 0+00:16:07  13:50:57
>   54 processes:  3 running, 51 sleeping
>   CPU:  0.4% user,  0.0% nice, 92.5% system,  0.0% interrupt,  7.1% idle
>   Mem: 22M Active, 13M Inact, 95M Wired, 1788K Cache, 15M Buf, 3797M Free
>   Swap: 4063M Total, 4063M Free
> 

-- 

 Frank 


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