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2026-06-26 - 03:34

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 50 highest latencies:
System rack7slot4s.osadl.org (updated Fri Jun 26, 2026 00:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1253299680,32cyclictest9323-21ssh00:15:122
1252499558,36cyclictest19139-21ssh22:15:131
12542995339,9cyclictest35966irq/58-eth021:20:133
1252499535,36cyclictest999-21ssh22:05:141
1252499523,6cyclictest131rcu_preempt19:35:131
1251699491,42cyclictest22933-21ssh22:35:140
1252499482,38cyclictest16735-21ssh21:20:131
1252499472,37cyclictest5474-21ssh23:55:131
1253299451,33cyclictest20476-21ssh21:40:122
12516994324,15cyclictest536-21usb-storage20:50:110
1251699421,10cyclictest131rcu_preempt23:00:130
1251699421,10cyclictest131rcu_preempt23:00:120
1252499410,32cyclictest13825-21ssh22:30:131
1254299403,24cyclictest35966irq/58-eth023:25:143
1251699402,31cyclictest12386-21ssh23:05:150
12532993915,15cyclictest27-21ksoftirqd/223:50:102
1251699392,33cyclictest23569-21ssh00:05:130
1251699392,31cyclictest28857-21sh23:50:120
1252499381,29cyclictest7045-21sshd23:20:141
1251699384,31cyclictest17615-21ssh22:50:140
1251699382,26cyclictest4877-21rm22:25:120
1254299371,26cyclictest35966irq/58-eth019:35:123
1252499373,27cyclictest16037-21rm23:25:121
12524993516,10cyclictest21-21ksoftirqd/120:50:121
1251699358,22cyclictest12-21ksoftirqd/021:30:120
12542993414,11cyclictest35966irq/58-eth000:35:123
1254299332,20cyclictest35966irq/58-eth023:55:113
1254299332,18cyclictest35966irq/58-eth021:40:113
1252499332,25cyclictest10063-21ssh22:10:131
1251699333,20cyclictest29578-21ssh21:45:130
12516993314,7cyclictest12-21ksoftirqd/022:40:100
1253299322,19cyclictest27-21ksoftirqd/220:30:142
12524993221,6cyclictest14583-21ssh00:00:181
1251699326,17cyclictest12-21ksoftirqd/021:00:140
12516993213,12cyclictest28041-21kworker/0:023:45:130
1254299303,15cyclictest0-21swapper/322:15:123
12542993016,9cyclictest35966irq/58-eth000:25:143
1253299303,16cyclictest27346irq/40-dwc2_hso22:10:112
1253299300,14cyclictest3321-21ssh23:00:142
1253299300,14cyclictest3321-21ssh23:00:132
1251699304,18cyclictest15195-21ssh21:55:120
1251699304,17cyclictest30466-21ssh23:15:120
12516992914,9cyclictest12-21ksoftirqd/020:20:110
1253299282,17cyclictest27346irq/40-dwc2_hso22:45:122
1253299281,19cyclictest27398-21ssh00:25:152
1251699285,13cyclictest24337-21ssh22:00:130
1254299279,10cyclictest35966irq/58-eth022:25:133
12542992717,7cyclictest35966irq/58-eth023:30:113
12532992710,13cyclictest0-21swapper/223:45:132
1251699272,20cyclictest10720-21sshd23:40:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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