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2026-05-06 - 06:15

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 Wed May 06, 2026 00:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2979199664,54cyclictest15303-21ssh23:15:131
29799996010,7cyclictest131rcu_preempt00:25:152
29779996011,7cyclictest131rcu_preempt21:55:140
29779995820,9cyclictest3575-21apt-get22:15:140
2979999571,32cyclictest28487-21ssh21:35:152
2979999551,32cyclictest0-21swapper/219:40:102
2977999513,41cyclictest15993-21ssh21:10:110
29799995029,12cyclictest27-21ksoftirqd/222:30:132
2979199491,38cyclictest6191-21ssh23:10:121
29779994814,25cyclictest0-21swapper/020:55:110
2977999481,36cyclictest7499-21ssh22:35:150
2979999477,24cyclictest131rcu_preempt23:26:412
29779994715,13cyclictest28378-21grep23:20:270
29799994515,7cyclictest29771-21cyclictest22:25:152
2977999452,34cyclictest30788-21ssh22:30:120
2979999442,30cyclictest930-21snmpd20:35:122
2977999431,33cyclictest6198-21rm23:10:110
2979999422,25cyclictest131rcu_preempt23:24:402
29779994214,11cyclictest12491-21ssh21:43:360
2979199412,9cyclictest21-21ksoftirqd/119:20:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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