https://bugs.kde.org/show_bug.cgi?id=465768
Bug ID: 465768
Summary: iowait is counted as cpu usage by per-core sensors
Classification: Plasma
Product: plasma-systemmonitor
Version: 5.26.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ksysguard-b...@kde.org
Reporter: yumpusamongus+...@gmail.com
CC: ahiems...@heimr.nl, plasma-b...@kde.org
Target Milestone: ---
Created attachment 156271
--> https://bugs.kde.org/attachment.cgi?id=156271&action=edit
script that reproduces the problem (and doesn't thrash the cache)
SUMMARY
IO wait time is counted as CPU busy time by whichever underlying library is
used plasma-systemmonitor, ksysguard, and desktop sensor widgets.
STEPS TO REPRODUCE
1. Open the "history" view of plasma-systemmonitor, or the "System Load" tab of
ksysguard, or have a system monitor widget using the "Core # Total Usage"
sensor on your panel.
2. Run the attached script. If you don't have any SATA drives, change
"/dev/sda" to something you do have.
OBSERVED RESULT
CPU usage appears to be 100%, even though the workload is totally I/O bound.
EXPECTED RESULT
CPU usage includes only % of time the CPU is executing instructions, matching
the much lower value reported by htop.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 37
(available in About System)
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
This has probably been reported before, as bug 339164 against the plasma4
widget.
--
You are receiving this mail because:
You are watching all bug changes.
