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2025-12-06 - 16:54

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 Sat Dec 06, 2025 12:45:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2500799655,48cyclictest7739-21ssh10:10:121
25023995335,12cyclictest29566irq/58-eth009:35:153
25023995335,12cyclictest29566irq/58-eth009:35:153
2499899529,6cyclictest131rcu_preempt09:15:140
2499899512,40cyclictest31843-21ssh12:25:160
2500799481,33cyclictest3438-21ssh11:10:141
2499899483,35cyclictest8313-21ssh12:30:160
2499899483,35cyclictest8313-21ssh12:30:150
2500799462,32cyclictest27212-21ssh11:25:271
2501599441,25cyclictest13909-21ssh10:35:142
2500799431,34cyclictest17392-21ssh12:35:291
2500799431,2cyclictest0-21swapper/109:55:131
25007994311,17cyclictest21-21ksoftirqd/110:30:151
2502399414,20cyclictest29566irq/58-eth012:15:133
2502399403,21cyclictest29566irq/58-eth012:30:163
2502399403,21cyclictest29566irq/58-eth012:30:163
2500799401,29cyclictest29264-21ssh10:45:121
2500799400,5cyclictest131rcu_preempt09:05:151
24998993915,18cyclictest12-21ksoftirqd/007:25:130
2499899391,30cyclictest864-21ssh09:45:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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