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2026-05-28 - 04:13

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 Thu May 28, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36719842264215,17sleep70-21swapper/719:08:307
36719552256216,16sleep20-21swapper/219:08:092
36718742246219,17sleep30-21swapper/319:07:053
36720572245217,18sleep40-21swapper/419:09:244
36720162245219,17sleep60-21swapper/619:08:536
36718822245200,16sleep10-21swapper/119:07:111
36719002244217,18sleep00-21swapper/019:07:270
36717212242218,16sleep50-21swapper/519:05:385
38055682910,0sleep03805569-21expr23:10:110
367237899390,1cyclictest0-21swapper/223:10:142
367239299329,1cyclictest0-21swapper/521:25:145
3672378993210,22cyclictest0-21swapper/219:43:592
3672378993210,22cyclictest0-21swapper/219:43:592
3672378992922,3cyclictest1391-21snmpd21:23:482
367240099270,25cyclictest0-21swapper/621:48:356
367240099270,25cyclictest0-21swapper/620:37:136
367238799270,1cyclictest0-21swapper/420:14:014
3672392992622,3cyclictest1391-21snmpd23:33:375
367239299260,24cyclictest0-21swapper/519:46:525
367239299260,22cyclictest0-21swapper/521:05:155
3672378992621,1cyclictest1391-21snmpd19:52:182
367237899260,24cyclictest0-21swapper/222:05:172
367237899260,24cyclictest0-21swapper/219:19:112
367237899260,22cyclictest0-21swapper/220:22:222
3672374992625,1cyclictest0-21swapper/119:17:591
367236999260,22cyclictest0-21swapper/019:25:470
3672405992522,3cyclictest1391-21snmpd21:03:207
3672405992521,3cyclictest3707283-21cat20:10:167
3672405992521,3cyclictest1391-21snmpd21:09:147
3672400992524,1cyclictest0-21swapper/619:17:596
3672400992521,3cyclictest1391-21snmpd21:11:296
3672400992518,5cyclictest0-21swapper/619:51:546
367240099250,23cyclictest0-21swapper/623:16:546
3672392992521,3cyclictest1391-21snmpd22:44:115
3672392992518,5cyclictest0-21swapper/521:17:155
367239299250,25cyclictest2698-21gmain21:48:075
367238799253,1cyclictest0-21swapper/423:26:524
3672387992524,1cyclictest0-21swapper/419:16:594
3672387992521,3cyclictest1391-21snmpd23:14:574
3672387992518,5cyclictest0-21swapper/423:06:214
3672387992518,5cyclictest0-21swapper/422:57:304
3672387992518,5cyclictest0-21swapper/400:06:594
367238799250,23cyclictest0-21swapper/422:42:504
3672383992521,3cyclictest1391-21snmpd23:44:103
3672383992521,3cyclictest1391-21snmpd22:51:163
3672378992521,3cyclictest1391-21snmpd23:19:392
3672378992521,3cyclictest1391-21snmpd20:30:012
367237899250,1cyclictest0-21swapper/221:11:532
3672374992521,3cyclictest1391-21snmpd21:24:271
3672374992518,3cyclictest0-21swapper/123:33:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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