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2026-09-06 - 01:50

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rack8slot6s.osadl.org (updated Sat Sep 05, 2026 12:43:39)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
283619910531050,2cyclictest1958-21kworker/3:2+events10:57:323
283619910521050,2cyclictest4383-21kworker/3:2+events09:04:193
283619910511049,2cyclictest1958-21kworker/3:2+events10:42:523
283619910511049,2cyclictest1958-21kworker/3:2+events10:42:523
283619910491046,3cyclictest25420-21kworker/3:0+events11:07:243
283449910481046,2cyclictest8894-21kworker/0:2+events07:19:240
283449910471045,2cyclictest18969-21turbostat12:14:560
283449910341033,1cyclictest27945-21kworker/0:2+events11:13:580
283449910331032,1cyclictest27897-21kworker/0:0+events09:06:070
283619910311030,1cyclictest30391-21kworker/3:0+events08:46:153
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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