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2026-04-05 - 02:55

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 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 rack7slot4s.osadl.org (updated Sun Apr 05, 2026 00:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21756995517,22cyclictest0-21swapper/219:40:122
2175699531,32cyclictest28623-21diskmemload23:10:132
2175699531,32cyclictest28623-21diskmemload23:10:122
21756995123,24cyclictest29282-21ssh21:40:112
2174899513,41cyclictest25236-21ssh22:50:141
2176499505,33cyclictest28366irq/58-eth022:15:133
2174099503,36cyclictest3818-21ssh22:20:110
21748994832,7cyclictest15267-21sh00:15:141
2175699462,29cyclictest20352-21ssh21:35:142
2174099466,8cyclictest131rcu_preempt22:45:150
21740994610,7cyclictest131rcu_preempt22:00:130
21740994536,5cyclictest131rcu_preempt22:15:130
21740994523,9cyclictest131rcu_preempt20:25:140
2174099452,36cyclictest24337-21ssh00:20:140
2174099441,39cyclictest7258-21ssh22:40:110
2176499422,23cyclictest28366irq/58-eth022:30:123
2175699404,29cyclictest25919-21ssh21:20:122
2174099401,31cyclictest29296-21ssh21:40:120
2176499391,22cyclictest28366irq/58-eth023:40:133
21756993918,16cyclictest0-21swapper/221:55:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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