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2025-12-20 - 13:41

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 here to display the system's profile data or here to proceed to next system.
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 20 highest latencies:
System rackcslot7s.osadl.org (updated Sat Dec 20, 2025 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8163021340,6sleep1251rcuc/123:50:131
41783312930,6sleep24497-21PK-Backend19:15:312
591852880,5sleep10-21swapper/122:45:251
4174823998880,5cyclictest4497-21PK-Backend20:12:200
197399880,8rtkit-daemon1972-21rtkit-daemon22:23:411
60972850,5sleep30-21swapper/320:15:293
197399850,8rtkit-daemon1972-21rtkit-daemon22:25:311
197399710,60rtkit-daemon0-21swapper/019:08:030
4174833997062,5cyclictest0-21swapper/320:12:203
4174828996838,7cyclictest141rcu_preempt00:05:592
4174826996860,5cyclictest0-21swapper/120:12:201
4174823996817,17cyclictest54400-40apt-check22:32:030
4174828996637,8cyclictest141rcu_preempt21:28:592
417448026647,13sleep20-21swapper/219:07:162
417436226544,14sleep10-21swapper/119:05:461
4174828996434,7cyclictest141rcu_preempt20:44:582
417442926445,13sleep30-21swapper/319:06:363
4174823996112,30cyclictest0-21swapper/022:52:030
4174833996021,12cyclictest42-21ksoftirqd/319:31:293
417482399609,29cyclictest79180-40lsb_release23:40:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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