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2025-12-16 - 05:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 10 highest latencies:
System rack5slot4s.osadl.org (updated Tue Dec 16, 2025 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12535812740,6sleep1291ktimers/119:44:021
13665442660,5sleep20-21swapper/221:35:022
14439652550,4sleep30-21swapper/322:54:063
1220874994942,5cyclictest1371262-21latency_hist21:40:011
1220874994939,7cyclictest1376191-21latency_hist21:45:011
1220870994941,5cyclictest1326674-21latency_hist20:55:010
1220870994938,8cyclictest1544246-21latency_hist00:35:000
1220870994740,5cyclictest1340944-21kworker/u8:2+flush-8:021:14:040
1220874994642,3cyclictest1404076-21kworker/u8:3+events_unbound22:25:141
1220874994642,3cyclictest1404076-21kworker/u8:3+events_unbound22:25:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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