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2026-04-27 - 11:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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.
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 rackeslot5s.osadl.org (updated Mon Apr 27, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3073699260,25cyclictest0-21swapper/122:15:531
3073699260,1cyclictest22519-21cron21:40:011
30736992523,1cyclictest1764-21sh23:56:421
3073299251,0cyclictest62550irq/127-eno121:21:190
3073299250,24cyclictest12627-21ssh22:31:090
3073299250,24cyclictest0-21swapper/022:04:120
30745992423,1cyclictest23984-21diskmemload21:24:303
30745992423,0cyclictest0-21swapper/322:10:033
30745992422,1cyclictest24150-21awk00:20:003
3074599240,23cyclictest23984-21diskmemload23:16:583
3074599240,23cyclictest0-21swapper/323:25:563
3074599240,23cyclictest0-21swapper/322:55:443
3074599240,23cyclictest0-21swapper/321:25:123
3074599240,23cyclictest0-21swapper/300:27:043
3074599240,1cyclictest20318-21ssh22:08:203
30741992422,1cyclictest0-21swapper/222:48:472
3074199240,23cyclictest498-21ssh22:51:112
3074199240,23cyclictest0-21swapper/222:17:002
3074199240,23cyclictest0-21swapper/221:40:582
30736992421,2cyclictest17400-21runrttasks23:09:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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