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2026-07-03 - 07:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #7

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rackfslot7s.osadl.org (updated Fri Jul 03, 2026 00:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
99275899367118,3649cyclictest1079479-21kworker/0:0+events23:40:110
99276299360117,3580cyclictest1091089-21kworker/1:0+events00:21:041
99275899343615,3417cyclictest1060531-21kworker/0:2+events22:45:130
99276999341117,3388cyclictest992388-21kworker/3:1+events19:35:153
99275899316115,3142cyclictest1040761-21kworker/0:2+events22:25:150
9927669930721,3066cyclictest1087735-21kworker/2:2+events00:25:162
99276299306315,3043cyclictest1042352-21kworker/1:1+events22:00:151
99275899305914,3040cyclictest1018324-21kworker/0:0+events20:30:170
99276999303015,3010cyclictest1050791-21kworker/3:1+events22:15:183
99276999301615,2998cyclictest1042178-21kworker/3:0+events21:45:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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