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2026-08-25 - 21:14

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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  Intel
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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Tue Aug 25, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
72430021860,5sleep30-21swapper/310:12:453
65942521810,3sleep30-21swapper/309:07:443
54855121590,3sleep3575-21kworker/3:2+events07:17:483
6445652610,3sleep3575-21kworker/3:2-events08:52:433
8157732600,2sleep0201rcuc/011:47:410
539513996054,4cyclictest534482-21kworker/u8:0+events_unbound07:15:021
539513995550,4cyclictest824756-21kworker/u8:3+events_unbound12:22:521
539513995448,4cyclictest590866-21kworker/u8:2+flush-8:008:57:511
539508995342,8cyclictest859458-21latency_hist12:30:000
539513995246,4cyclictest621193-21kworker/u8:3+events_unbound09:30:011
8224462510,3sleep3575-21kworker/3:2+events11:52:423
539513995145,4cyclictest804955-21kworker/u8:0+flush-8:011:37:501
539513995045,3cyclictest705195-21kworker/u8:1+flush-8:010:12:541
539513995044,4cyclictest740252-21kworker/u8:1+events_unbound10:37:391
7739882490,3chrt201rcuc/011:02:500
539513994943,4cyclictest740252-21kworker/u8:1+events_unbound12:32:351
539513994939,7cyclictest275-21systemd-journal08:55:011
539513994841,5cyclictest740252-21kworker/u8:1+flush-8:011:17:531
539513994839,7cyclictest544366-21latency_hist07:15:011
539513994741,4cyclictest730318-21kworker/u8:2+events_unbound10:22:461
539513994741,4cyclictest730318-21kworker/u8:2+events_unbound10:22:461
539508994729,15cyclictest640766-21latency_hist08:50:010
539508994724,19cyclictest789697-21apt-get11:20:010
539513994639,5cyclictest824756-21kworker/u8:3+flush-8:012:02:521
539513994639,5cyclictest740252-21kworker/u8:1+flush-8:010:52:471
539513994639,5cyclictest621193-21kworker/u8:3+events_unbound08:42:451
539513994639,5cyclictest590866-21kworker/u8:2+flush-8:009:02:451
539513994538,5cyclictest784945-21kworker/u8:3+flush-8:011:32:411
539508994527,16cyclictest401-21dbus-daemon07:25:000
539513994439,3cyclictest740252-21kworker/u8:1+events_unbound12:00:011
539513994438,4cyclictest621193-21kworker/u8:3+events_unbound09:10:011
539513994438,4cyclictest590866-21kworker/u8:2+flush-8:008:37:481
539508994423,18cyclictest275-21systemd-journal11:32:500
539513994339,3cyclictest3930081-21kworker/u8:1+flush-8:007:43:501
539513994337,4cyclictest3930081-21kworker/u8:1+events_unbound09:15:011
539513994336,4cyclictest804955-21kworker/u8:0+flush-8:011:52:521
539513994237,4cyclictest590866-21kworker/u8:2+flush-8:009:20:001
539513994235,5cyclictest774636-21kworker/u8:2+flush-8:012:07:371
539513994135,4cyclictest740252-21kworker/u8:1+events_unbound11:47:371
539513994133,6cyclictest810149-21apt-get11:42:321
539513994132,7cyclictest275-21systemd-journal08:31:201
539517994031,7cyclictest695359-21gpgv09:45:002
539517994014,8cyclictest275-21systemd-journal10:20:202
539517994014,8cyclictest275-21systemd-journal10:20:202
539513994036,3cyclictest590866-21kworker/u8:2+flush-8:009:47:391
539513994034,4cyclictest740252-21kworker/u8:1+events_unbound10:47:461
539513994032,5cyclictest570962-21latency_hist07:40:011
539513994031,7cyclictest596017-21latency_hist08:05:001
539508994032,6cyclictest749857-21latency_hist10:40:010
539508994023,15cyclictest715920-21cpuspeed_turbos10:07:360
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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