https://bugs.kde.org/show_bug.cgi?id=490675
Bug ID: 490675
Summary: [cpu_plugin] k10temp does not work for multi-die
systems
Classification: Frameworks and Libraries
Product: ksystemstats
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: plasma-b...@kde.org
Reporter: l...@lokis-chaos.de
CC: ahiems...@heimr.nl
Target Milestone: ---
Created attachment 171913
--> https://bugs.kde.org/attachment.cgi?id=171913&action=edit
Topology of 2970WX ThreadRipper
SUMMARY
The k10temp implementastion in the cpu_plugin of ksystemstats maps the value of
tdie or tctl to all CPU cores.
This ignores the fact, that there are multi-die CPUs like ThreadRipper.
In `linuxcpuplugin.cpp`, `LinuxCpuPluginPrivate::addSensorsAmd()` is called
once for each found k10temp sensor. Each call sets the found sensor for all cpu
cores.
On ThreadRipper Systems, more then one die is present (see attachment).
This looses important information. Also, the k10temp sensor is blacklisted in
the lmsensors plugin, despite the fact that this seems to be the only logical
way to provide those temperatures.
STEPS TO REPRODUCE
1. Run a threadripper system
2. get the temperatures for all CPU cores
3. compare them
OBSERVED RESULT
all values are identical
EXPECTED RESULT
the values should differ, as different cores are on different dies with
different temperatures
SOFTWARE/OS VERSIONS
git commit b994c553f2e5d5d235f289c0112f1509b18e4e45
ADDITIONAL INFORMATION
This may also be related to missing temperature values over all #474766
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