Not that many folks dived in, but the conclusion to this was that
swapping the L3426 processor with an X series fixed the mis-reading. I
presume therefore that this looks more like a kernel issue than an
lm-sensors issue? Who to file bug reports to about coretemp mis-reads?
Thanks
Ed W
On 26/10/2010 10:25, Ed W wrote:
Hi, I have a pair of (identical) new supermicro machines and had some
significant issues getting accurate temps out of them. Bios updates
(betas) have fixed most of them, but I'm finally stuck with the CPU
temps reading exceptionally high using the kernel coretemp module
Board is the supermicro X8SIE-LN4F. Processor is an intel L3426 (ie
the 45W part).
Sensors 3.1.2 reads (loaded):
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +81.0C (high = +94.0C, crit = +100.0C)
coretemp-isa-0001
Adapter: ISA adapter
Core 1: +79.0C (high = +94.0C, crit = +100.0C)
coretemp-isa-0002
Adapter: ISA adapter
Core 2: +81.0C (high = +94.0C, crit = +100.0C)
coretemp-isa-0003
Adapter: ISA adapter
Core 3: +77.0C (high = +94.0C, crit = +100.0C)
Idle the temps are around 55-60C
There is no bios CPU temp to compare against, all I get is a "Low"
reading normally, going up to a "Med" reading when the temps are as
above (there is also a "high", but unknown when that kicks in)
Additionally there are some temps shown through the sensors module
(these were affected by the bios fixes)
temp1: +36.0C (high = +60.0C, hyst = +55.0C) sensor = thermistor
temp2: +78.5C (high = +95.0C, hyst = +92.0C) sensor = diode
temp3: +30.0C (high = +80.0C, hyst = +75.0C) sensor = thermistor
The bottom one coincides with the bios "System Temp" and is believed
to be the thermistor at the back of the board. Unknown what the other
two are. The Temp2 tends to look a little like the average of the CPU
temps though?
Basic sanity check though. I take the lid off the machine and the
heatsink is completely cold at idle and slightly warm under load... I
have reseated the heatsink on one of the machines as a sanity check,
no difference. Both machines are reporting the same range of
temperatures under similar loads. I checked temps using kernel 2.6.32
and 2.6.36 with similar results
My best guess is that the CPU temp sensor is mis-reading. However, is
this possible? I understand the CPU temp is specified as an inversion
from the max value and hence in any case if the observed temp is wrong
then the point is still that my "margin" for safety is something like
the 94C - 81C = 13C from max temp?
This machine needs to last long term, I'm currently a bit worried
about the reported temps - can anyone please shed some light on
whether this is just a bad reading and should be ignored?
Thanks
Ed W
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