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2026-07-03 - 10:37

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 Fri Jul 03, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21731472271262,6sleep20-21swapper/218:13:352
21731402264213,41sleep40-21swapper/418:13:294
21730472262215,16sleep70-21swapper/718:11:587
21730822261210,17sleep60-21swapper/618:12:346
21732732245220,16sleep50-21swapper/518:15:325
21732162245219,17sleep00-21swapper/018:14:380
21730412243218,17sleep10-21swapper/118:11:511
21730432242218,16sleep30-21swapper/318:11:533
23141802910,0sleep10-21swapper/123:07:031
2173694993330,2cyclictest1390-21snmpd21:19:312
2173694993129,1cyclictest0-21swapper/200:28:002
217368999300,1cyclictest0-21swapper/121:29:181
217368999300,1cyclictest0-21swapper/119:38:201
217371699280,28cyclictest2281628-21turbostat22:08:317
2173716992726,1cyclictest0-21swapper/721:58:397
2173716992726,1cyclictest0-21swapper/721:40:017
217371699270,23cyclictest0-21swapper/722:24:447
2173698992721,5cyclictest1390-21snmpd20:29:133
217369899271,23cyclictest0-21swapper/320:45:133
217371699263,22cyclictest0-21swapper/721:09:167
2173707992622,3cyclictest1390-21snmpd22:03:175
2173698992620,4cyclictest0-21swapper/320:53:353
2173698992620,4cyclictest0-21swapper/320:53:353
217369899260,23cyclictest0-21swapper/320:41:133
2173685992622,3cyclictest2241750-21cat20:36:130
2173716992521,3cyclictest1390-21snmpd18:35:267
2173716992521,3cyclictest1390-21snmpd18:18:097
2173712992524,1cyclictest0-21swapper/622:21:596
2173703992521,3cyclictest1390-21snmpd21:44:134
2173703992521,3cyclictest1390-21snmpd21:04:074
2173703992521,3cyclictest1390-21snmpd21:04:074
2173698992520,4cyclictest1390-21snmpd22:37:493
2173694992521,3cyclictest1390-21snmpd21:59:242
217369499250,1cyclictest0-21swapper/220:13:062
2173689992521,3cyclictest2205956-21cat19:20:551
2173689992521,3cyclictest1390-21snmpd19:16:111
2173689992521,3cyclictest1390-21snmpd00:35:431
2173685992522,2cyclictest1390-21snmpd19:40:470
2173716992420,3cyclictest1390-21snmpd22:15:027
2173716992418,4cyclictest0-21swapper/723:04:427
217371699240,22cyclictest0-21swapper/719:50:377
2173707992422,1cyclictest1390-21snmpd00:03:005
2173707992420,3cyclictest1390-21snmpd23:28:225
2173703992421,2cyclictest1390-21snmpd21:23:454
2173703992419,4cyclictest1147-21lldpd19:30:174
2173698992420,3cyclictest1390-21snmpd22:46:103
2173698992417,3cyclictest0-21swapper/321:48:483
2173698992416,3cyclictest1390-21snmpd23:34:283
2173698992415,7cyclictest0-21swapper/319:32:293
217369899240,23cyclictest0-21swapper/322:55:063
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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