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2026-08-05 - 22:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #3

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 rack0slot3s.osadl.org (updated Wed Aug 05, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
772372279228,44sleep00-21swapper/018:48:290
773182261211,40sleep20-21swapper/218:49:392
771322260236,15sleep60-21swapper/618:47:106
771392259213,37sleep30-21swapper/318:47:153
771372258211,37sleep10-21swapper/118:47:131
773142257213,15sleep70-21swapper/718:49:367
772182245219,17sleep50-21swapper/518:48:185
772172244216,18sleep40-21swapper/418:48:164
77710994033,5cyclictest184145-21perl22:12:065
77697993730,3cyclictest0-21swapper/318:56:353
77710993329,2cyclictest0-21swapper/523:06:045
77705993231,1cyclictest0-21swapper/420:36:354
77697993231,1cyclictest0-21swapper/321:20:003
77697992928,1cyclictest0-21swapper/322:01:363
77697992822,2cyclictest0-21swapper/319:23:013
77697992821,6cyclictest1390-21snmpd23:33:163
7771099270,22cyclictest0-21swapper/500:11:055
7769299271,22cyclictest0-21swapper/221:48:452
7769299271,22cyclictest0-21swapper/221:48:442
7768399270,25cyclictest0-21swapper/023:20:420
77719992622,3cyclictest1390-21snmpd23:55:177
7771999260,24cyclictest0-21swapper/720:37:197
7771999260,24cyclictest0-21swapper/720:04:557
7771999260,24cyclictest0-21swapper/700:08:217
77710992618,3cyclictest0-21swapper/522:22:135
7771099260,23cyclictest0-21swapper/519:58:155
77697992620,4cyclictest0-21swapper/323:10:133
7769799260,23cyclictest0-21swapper/322:37:533
77692992622,3cyclictest167764-21cat21:40:212
77692992622,3cyclictest167764-21cat21:40:212
77692992622,3cyclictest1390-21snmpd00:13:372
77692992622,3cyclictest1390-21snmpd00:13:362
7769299260,22cyclictest0-21swapper/221:29:092
77688992622,3cyclictest1390-21snmpd21:28:311
77688992622,3cyclictest1390-21snmpd19:16:171
77688992622,3cyclictest1390-21snmpd19:16:171
7768899260,22cyclictest0-21swapper/122:21:541
77683992622,3cyclictest211834-21cat23:04:570
77719992521,3cyclictest1390-21snmpd23:08:357
77719992521,3cyclictest1390-21snmpd22:54:567
77719992521,3cyclictest1390-21snmpd19:26:077
77719992518,5cyclictest0-21swapper/723:03:307
77710992521,3cyclictest916-21NetworkManager00:29:345
7771099250,24cyclictest528-21systemd-journal20:02:375
7771099250,23cyclictest0-21swapper/521:38:115
77705992521,3cyclictest1390-21snmpd19:08:464
7770599250,1cyclictest0-21swapper/419:29:554
77697992520,4cyclictest1390-21snmpd23:03:433
77697992519,5cyclictest1390-21snmpd19:21:053
7769799250,22cyclictest0-21swapper/323:48:053
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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