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2026-01-09 - 04:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #3

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot3s.osadl.org (updated Fri Jan 09, 2026 00:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3389941991121,3cyclictest0-21swapper/021:45:020
3389941998076,2cyclictest0-21swapper/021:50:020
3389941998072,2cyclictest0-21swapper/023:20:020
338994199801,75cyclictest0-21swapper/022:10:020
3389941997975,2cyclictest0-21swapper/023:10:010
3389952997724,19cyclictest3403265-21cat23:25:023
3389952997422,18cyclictest3393801-21ls20:25:023
3389952997116,16cyclictest3393505-21munin-run20:20:003
3389946996728,35cyclictest274-21cron00:20:001
3389946996714,13cyclictest1-21systemd20:05:011
338994699662,15cyclictest3391411-21modprobe19:40:011
3389949996449,11cyclictest291rcuc/222:20:002
338994699632,15cyclictest3395841-21true21:05:011
3389952996237,18cyclictest238-21systemd-journal19:55:003
3389946996224,4cyclictest3395052-21latency_hist20:50:011
338994699613,18cyclictest238-21systemd-journal00:10:011
3389946996024,5cyclictest3392457-21latency_hist20:00:021
338994699602,19cyclictest3393520-21basename20:20:001
338994699602,17cyclictest3393005-21latency_hist20:10:021
338994699602,17cyclictest3393005-21latency_hist20:10:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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