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2026-05-15 - 20:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #4

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 100 highest latencies:
System rack7slot4s.osadl.org (updated Fri May 15, 2026 12:45:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
910699623,48cyclictest23409-21ssh12:25:120
911599596,42cyclictest30520-21ssh11:35:111
9106995920,26cyclictest12-21ksoftirqd/007:45:130
910699524,38cyclictest4479-21ssh09:15:130
910699521,37cyclictest10861-21ssh12:00:130
912599502,37cyclictest32422-21ssh12:30:122
911599504,33cyclictest16222-21ssh11:45:131
911599481,39cyclictest27857-21ssh09:10:101
911599472,37cyclictest12065-21ssh09:55:131
910699472,5cyclictest131rcu_preempt08:55:110
910699472,34cyclictest3594-21ssh11:20:120
911599451,29cyclictest22629-21ssh09:25:131
911599451,29cyclictest22629-21ssh09:25:121
910699442,30cyclictest2990-21ssh09:50:130
9133994235,4cyclictest35966irq/58-eth011:45:133
911599429,6cyclictest131rcu_preempt10:45:141
911599429,6cyclictest131rcu_preempt10:45:131
910699425,29cyclictest32412-21ssh11:00:130
910699424,27cyclictest28766-21rm10:40:150
9115994113,24cyclictest21-21ksoftirqd/112:30:121
910699414,6cyclictest131rcu_preempt09:05:150
913399392,20cyclictest35966irq/58-eth011:15:143
913399392,20cyclictest35966irq/58-eth011:15:133
912599392,29cyclictest30209-21ssh10:05:122
911599395,26cyclictest15868-21rm10:15:111
910699392,25cyclictest18014-21ssh11:10:120
910699392,25cyclictest18014-21ssh11:10:110
911599382,26cyclictest13611-21ssh09:20:151
910699383,27cyclictest14347-21ssh10:50:110
910699381,30cyclictest17317-21ssh09:40:110
913399374,22cyclictest35966irq/58-eth012:00:143
912599372,19cyclictest26291-21ssh11:14:412
912599372,19cyclictest26291-21ssh11:14:402
912599371,19cyclictest0-21swapper/207:45:112
912599362,18cyclictest29393-21rm10:04:312
912599360,33cyclictest0-21swapper/208:15:142
912599352,28cyclictest2111-21ssh11:18:442
912599352,28cyclictest2111-21ssh11:18:432
912599352,17cyclictest11202-21ssh10:46:442
912599352,17cyclictest11202-21ssh10:46:432
911599351,3cyclictest131rcu_preempt09:00:141
913399341,23cyclictest35966irq/58-eth009:45:123
912599345,22cyclictest0-21swapper/209:10:112
912599340,22cyclictest15875-21ssh10:15:112
913399333,24cyclictest35966irq/58-eth010:10:133
913399333,21cyclictest35966irq/58-eth009:30:123
913399333,21cyclictest35966irq/58-eth009:30:113
913399331,21cyclictest35966irq/58-eth010:15:113
912599332,27cyclictest8944-21ssh12:35:122
911599336,19cyclictest21-21ksoftirqd/108:15:121
910699331,22cyclictest0-21swapper/012:05:120
913399322,21cyclictest35966irq/58-eth007:15:143
9133993217,9cyclictest35966irq/58-eth012:20:143
9133993214,14cyclictest35966irq/58-eth009:55:133
912599323,18cyclictest27346irq/40-dwc2_hso08:45:132
911599322,24cyclictest1686-21ssh10:25:121
910699325,18cyclictest5337-21ssh12:15:120
910699322,24cyclictest28800-21ssh12:10:140
913399313,17cyclictest35966irq/58-eth008:15:133
913399312,24cyclictest35966irq/58-eth010:05:123
911599312,24cyclictest31659-21ssh09:30:121
911599312,24cyclictest31659-21ssh09:30:111
910699312,22cyclictest12695-21ssh10:11:430
913399306,15cyclictest35966irq/58-eth011:20:113
912599304,14cyclictest27346irq/40-dwc2_hso08:30:112
912599302,19cyclictest26369-21ssh09:45:132
9125993013,12cyclictest10685-21ssh10:30:112
911599303,20cyclictest28785-21ssh12:10:121
913399293,21cyclictest35966irq/58-eth010:25:123
913399293,18cyclictest35966irq/58-eth011:10:123
913399293,18cyclictest35966irq/58-eth011:10:113
9133992914,11cyclictest35966irq/58-eth010:50:123
912599293,6cyclictest271ksoftirqd/210:10:262
912599292,11cyclictest17335-21ssh11:09:402
9125992916,4cyclictest0-21swapper/211:50:112
911599297,16cyclictest21-21ksoftirqd/110:35:121
911599292,21cyclictest8386-21ssh11:04:441
911599292,19cyclictest6821-21ssh10:10:131
910699292,21cyclictest4499-21ssh10:07:440
9106992914,9cyclictest9098-21cyclictest11:15:130
9106992914,9cyclictest9098-21cyclictest11:15:130
913399287,8cyclictest35966irq/58-eth012:10:143
913399283,19cyclictest35966irq/58-eth007:25:123
913399283,18cyclictest0-21swapper/311:05:443
913399281,17cyclictest35966irq/58-eth010:40:143
912599284,14cyclictest27346irq/40-dwc2_hso08:20:122
912599282,18cyclictest27346irq/40-dwc2_hso10:35:132
9125992818,3cyclictest261rcuc/212:23:072
9125992814,8cyclictest536-21usb-storage08:55:102
912599280,18cyclictest27346irq/40-dwc2_hso12:15:132
910699282,20cyclictest23452-21ssh10:18:450
910699282,18cyclictest10704-21ssh10:30:130
9106992821,4cyclictest0-21swapper/010:20:120
9133992714,8cyclictest35966irq/58-eth012:05:253
912599273,4cyclictest27-21ksoftirqd/212:00:202
912599273,13cyclictest0-21swapper/209:37:202
912599271,20cyclictest19778-21ssh12:05:132
9125992710,13cyclictest21557-21ssh11:30:122
911599273,16cyclictest21-21ksoftirqd/108:35:131
911599272,7cyclictest21-21ksoftirqd/108:40:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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