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2026-03-16 - 09:27

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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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 rackeslot5s.osadl.org (updated Mon Mar 16, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29526992522,2cyclictest607-21in:imuxsock22:00:013
2952699250,24cyclictest22773-21diskmemload22:59:253
2952699250,24cyclictest22773-21diskmemload22:25:373
29523992523,1cyclictest0-21swapper/200:03:042
2952399252,2cyclictest12969-21sed22:32:152
2952399250,25cyclictest0-21swapper/222:46:032
2952399250,24cyclictest13261-21ssh00:37:092
2952399250,24cyclictest0-21swapper/221:16:122
2952099250,23cyclictest313-21systemd-journal21:10:011
29519992523,1cyclictest0-21swapper/000:32:240
2951999250,24cyclictest0-21swapper/021:10:200
2951999250,24cyclictest0-21swapper/000:18:260
2952699240,2cyclictest5743-21ssh23:58:383
2952699240,24cyclictest22773-21diskmemload00:10:363
2952699240,23cyclictest22773-21diskmemload23:51:133
2952699240,23cyclictest22773-21diskmemload23:32:213
2952699240,23cyclictest22773-21diskmemload22:54:113
2952699240,1cyclictest0-21swapper/300:38:353
2952699240,0cyclictest22773-21diskmemload22:40:303
29523992423,0cyclictest28185-21apt-get22:17:062
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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