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2025-09-17 - 08:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, 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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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Wed Sep 17, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2230991090,8rtkit-daemon0-21swapper/121:19:291
2230991020,6rtkit-daemon0-21swapper/121:40:281
2230991020,6rtkit-daemon0-21swapper/117:56:291
223099990,6rtkit-daemon0-21swapper/117:53:371
223099980,7rtkit-daemon2610-21taskset22:01:271
223099980,7rtkit-daemon2610-21taskset22:01:271
223099980,6rtkit-daemon0-21swapper/119:21:261
223099980,6rtkit-daemon0-21swapper/118:20:061
223099980,6rtkit-daemon0-21swapper/118:14:281
223099980,6rtkit-daemon0-21swapper/118:08:511
223099970,6rtkit-daemon0-21swapper/122:09:421
123272970,3sleep2281ktimersoftd/221:14:202
123272970,3sleep2281ktimersoftd/221:14:202
32275999635,9cyclictest22724-21unixbench_multi21:34:330
223099960,5rtkit-daemon0-21swapper/122:14:261
223099950,7rtkit-daemon11782-21expr21:14:141
223099950,7rtkit-daemon11782-21expr21:14:141
223099950,6rtkit-daemon0-21swapper/122:49:101
223099950,6rtkit-daemon0-21swapper/121:44:431
223099950,6rtkit-daemon0-21swapper/119:30:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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