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2026-08-21 - 03:34

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 Aug 21, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6582142265216,16sleep10-21swapper/118:51:441
6584662261214,16sleep20-21swapper/218:55:072
6584492259214,16sleep30-21swapper/318:54:513
6582422258209,17sleep00-21swapper/018:52:090
6581692255214,32sleep70-21swapper/718:51:087
6584692252210,33sleep50-21swapper/518:55:105
6584002246220,17sleep60-21swapper/618:54:126
6583712245219,17sleep40-21swapper/418:53:444
658824993418,15cyclictest1390-21snmpd21:03:446
658807993318,14cyclictest0-21swapper/221:03:432
658820993128,2cyclictest1390-21snmpd23:58:275
658803993028,1cyclictest0-21swapper/122:40:001
658803993028,1cyclictest0-21swapper/122:40:001
658807992927,1cyclictest3919436-21kworker/2:2+events21:48:002
658824992827,1cyclictest0-21swapper/621:48:006
658816992818,5cyclictest0-21swapper/423:24:014
65881299285,23cyclictest0-21swapper/321:13:113
658798992726,1cyclictest0-21swapper/020:44:380
65881699260,22cyclictest0-21swapper/400:30:324
65879899260,22cyclictest0-21swapper/020:20:400
658824992521,3cyclictest1390-21snmpd23:34:076
658824992521,3cyclictest1390-21snmpd22:09:036
658820992521,3cyclictest751600-21cat21:47:555
658816992518,5cyclictest0-21swapper/400:29:074
658812992518,3cyclictest0-21swapper/300:19:003
658807992522,2cyclictest3919436-21kworker/2:2+events21:06:102
658803992524,1cyclictest0-21swapper/123:13:151
658803992518,3cyclictest0-21swapper/120:28:081
658798992518,5cyclictest0-21swapper/019:54:150
658827992420,3cyclictest1390-21snmpd22:36:147
658824992422,1cyclictest729365-21perl21:06:116
658824992422,1cyclictest1390-21snmpd21:36:366
658824992422,1cyclictest0-21swapper/622:03:356
658824992421,2cyclictest528-21systemd-journal23:21:416
658820992421,2cyclictest1390-21snmpd22:04:445
658820992418,4cyclictest0-21swapper/520:15:585
658820992418,2cyclictest0-21swapper/519:18:275
658816992418,4cyclictest0-21swapper/420:12:104
658816992418,4cyclictest0-21swapper/420:12:104
65881699240,22cyclictest0-21swapper/419:57:334
658812992423,1cyclictest0-21swapper/300:16:493
658812992421,3cyclictest1390-21snmpd20:56:253
65881299240,1cyclictest0-21swapper/319:22:283
658807992422,2cyclictest3919436-21kworker/2:2+events19:31:312
658807992421,2cyclictest3919436-21kworker/2:2+events23:21:412
658807992421,2cyclictest3919436-21kworker/2:2+events22:03:402
658807992421,2cyclictest3919436-21kworker/2:2+events21:53:002
658807992421,2cyclictest3919436-21kworker/2:2+events20:55:172
658807992421,2cyclictest3919436-21kworker/2:2+events20:13:162
658807992421,2cyclictest3919436-21kworker/2:2+events20:13:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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