ThreadRipper 1950X context: example kldload amdtemp related temperature reports for idle conditions?

[Mark Millard]

Is anyone familiar with what what they normally see on an idle
ThreadRipper 1950X via the likes of (presumes kldload amdtemp
had already been done):

# sysctl dev.amdtemp | grep "[0-9]\.[0-9]C$"

(Approximate ambient air temperature for the context would be a
bonus.)

I do not have a history of monitoring this, unfortunately.

===
Mark Millard
marklmi at yahoo.com



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[Mark Millard]

Post by Mark Millard
Is anyone familiar with what what they normally see on an idle
ThreadRipper 1950X via the likes of (presumes kldload amdtemp
# sysctl dev.amdtemp | grep "[0-9]\.[0-9]C$"
(Approximate ambient air temperature for the context would be a
bonus.)
I do not have a history of monitoring this, unfortunately.

What I see for idle vs all hardware threads fully busy
(buildworld -j32 's llvm lib* build activity):

fully busy: about 95 degC reported
idle: low 60's degC reported, say 62 degC:
(varies more than the 95 figure does)

# sysctl dev.amdtemp | grep "[0-9]\.[0-9]C$"
dev.amdtemp.1.core0.sensor0: 62.1C
dev.amdtemp.0.ccd0: 62.5C
dev.amdtemp.0.core0.sensor0: 62.1C

AMD's published 1950X maximum operating Tjmax is 68 degC.
The max reported figure's delta vs. documented maximum:
about 95 degC - 68 degC = 27 degC

Various notes on the web report that in order for the
tCTL used for fan control to have about the same maximum
across various machines, ThreadRipper 1950X's use:

tCTL = operatingTjmax + 27 degC

So, it looks like the dev.amdtemp reported values are
tCTL-like for units, so biased toward fan control use.

Idle shifted similarly down from reported:
62 degC - 27 degC = about 35 degC

Overall: it seems I'm seeing a range for idle through
fully-busy of about (operatingTjmax):

35 degC .. 68 degC

but reported as more like (tCTL):

62 degC .. 95 degC


===
Mark Millard
marklmi at yahoo.com



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[Tomek CEDRO]

Hey there Mark, is it possible to verify the measured temperatures against
physical device with some sort of thermometer? You can almost boil a water
with 95C o_O

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CeDeROM, SQ7MHZ, http://www.tomek.cedro.info