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2025-12-22 - 08:22

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 Mon Dec 22, 2025 00:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23384996327,22cyclictest28366irq/58-eth000:30:133
2337699611,38cyclictest10997-21ssh22:25:132
23376995532,17cyclictest6048-21apt-get21:45:132
23376995530,6cyclictest1949-21ssh00:30:132
23376995319,12cyclictest0-21swapper/221:55:122
23376995311,34cyclictest0-21swapper/221:25:152
2337699523,41cyclictest8291-21ssh00:15:152
2336699514,35cyclictest17169-21ssh00:20:151
2338499474,25cyclictest28366irq/58-eth000:05:133
23376994738,3cyclictest21137-21apt-get21:35:162
23376994636,5cyclictest22346irq/40-dwc2_hso23:20:112
23376994534,5cyclictest13443-21apt-get22:45:132
23376994424,9cyclictest4758-21ssh22:40:142
23376994424,9cyclictest4758-21ssh22:40:142
23376994318,18cyclictest0-21swapper/219:15:152
23376994318,18cyclictest0-21swapper/219:15:152
2336699433,6cyclictest131rcu_preempt00:30:141
2335799438,31cyclictest19695-21ssh22:30:120
23376994227,12cyclictest9651-21apt-get21:10:142
23376994221,16cyclictest0-21swapper/219:55:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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