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2026-04-10 - 20:28

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 50 highest latencies:
System rackeslot5s.osadl.org (updated Fri Apr 10, 2026 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30857992722,4cyclictest0-21swapper/210:05:442
3085799260,25cyclictest6757-21ssh09:55:462
3085899250,24cyclictest9705-21rm09:27:353
30857992520,1cyclictest24995-21diskmemload10:17:492
3085799250,24cyclictest0-21swapper/212:21:022
3085399250,24cyclictest24995-21diskmemload11:26:031
3085399250,24cyclictest24995-21diskmemload09:36:131
3085399250,24cyclictest0-21swapper/112:35:231
3085399250,24cyclictest0-21swapper/110:38:581
3084899250,24cyclictest24995-21diskmemload09:44:560
3084899250,24cyclictest0-21swapper/012:04:150
3084899250,24cyclictest0-21swapper/010:21:090
3085899240,23cyclictest5740-21ssh09:54:363
30857992420,2cyclictest32592-21rm09:18:392
3085799240,23cyclictest24995-21diskmemload12:05:322
3085799240,23cyclictest1453-21ssh11:58:472
3085399240,0cyclictest1144-21apt-get08:24:141
30848992423,1cyclictest0-21swapper/010:36:000
30848992422,1cyclictest26680-21sh11:19:200
30848992422,1cyclictest0-21swapper/011:24:350
30848992422,1cyclictest0-21swapper/009:46:360
3084899240,1cyclictest27176-21apt-get12:24:150
3084899240,1cyclictest24995-21diskmemload10:12:450
3084899240,1cyclictest11663-21ssh10:00:250
30858992323,0cyclictest24995-21diskmemload12:20:243
30858992323,0cyclictest0-21swapper/312:08:123
30858992323,0cyclictest0-21swapper/311:21:413
30858992321,1cyclictest28282-21idleruntime-cro09:45:003
3085899230,23cyclictest32084-21ssh11:55:593
3085899230,23cyclictest0-21swapper/312:36:093
3085899230,23cyclictest0-21swapper/311:35:083
3085899230,23cyclictest0-21swapper/309:38:243
3085899230,23cyclictest0-21swapper/309:19:073
3085899230,22cyclictest9365-21munin-run10:30:003
3085899230,22cyclictest32659-21rm10:21:293
3085899230,22cyclictest25023-21ls09:10:003
3085899230,22cyclictest24995-21diskmemload11:29:063
3085899230,22cyclictest24995-21diskmemload10:06:213
3085899230,22cyclictest23803-21ssh11:15:563
3085899230,22cyclictest0-21swapper/310:00:253
3085899230,1cyclictest25270-21ssh10:45:543
3085899230,0cyclictest24995-21diskmemload11:04:393
3085899230,0cyclictest0-21swapper/312:13:183
3085899230,0cyclictest0-21swapper/309:55:253
3085899230,0cyclictest0-21swapper/309:46:003
30857992323,0cyclictest0-21swapper/211:05:202
30857992321,2cyclictest8440-21ssh11:00:502
30857992321,1cyclictest4509-21ssh10:57:412
30857992321,1cyclictest4509-21ssh10:57:412
30857992321,1cyclictest0-21swapper/209:24:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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