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2026-09-23 - 20:40

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 Sep 23, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26069542274266,5sleep40-21swapper/418:58:224
26067902274266,5sleep10-21swapper/118:56:141
26068222264218,16sleep00-21swapper/018:56:380
26069052262213,17sleep50-21swapper/518:57:515
26069272258217,33sleep30-21swapper/318:58:043
26069062254212,33sleep60-21swapper/618:57:516
26069782247220,18sleep70-21swapper/718:58:337
26070222241216,16sleep20-21swapper/218:59:012
2607426993630,4cyclictest0-21swapper/423:28:044
2607426993531,3cyclictest1390-21snmpd00:35:044
260743599290,29cyclictest0-21swapper/620:59:056
2607426992922,6cyclictest1390-21snmpd22:00:424
2607421992827,1cyclictest2279892-21kworker/3:1+events00:08:523
2607412992827,1cyclictest0-21swapper/122:17:301
260740799270,25cyclictest0-21swapper/019:43:270
260740799270,25cyclictest0-21swapper/019:43:270
260740799270,23cyclictest0-21swapper/022:00:480
260743999260,22cyclictest0-21swapper/720:34:477
260743999260,22cyclictest0-21swapper/719:31:537
2607435992622,3cyclictest1390-21snmpd21:24:026
2607426992622,3cyclictest1390-21snmpd22:32:404
260740799260,26cyclictest0-21swapper/019:37:440
260740799260,26cyclictest0-21swapper/019:37:430
260740799260,22cyclictest0-21swapper/000:32:580
26978672250,1sleep00-21swapper/021:45:170
2607439992521,3cyclictest1390-21snmpd21:55:307
2607439992518,5cyclictest0-21swapper/720:32:507
2607435992518,3cyclictest0-21swapper/600:27:496
260743599251,22cyclictest0-21swapper/621:56:476
2607430992518,5cyclictest0-21swapper/521:40:135
2607430992518,5cyclictest0-21swapper/520:40:305
2607430992518,5cyclictest0-21swapper/500:26:475
2607426992521,3cyclictest1390-21snmpd20:22:484
260742699250,25cyclictest0-21swapper/419:36:334
260742699250,25cyclictest0-21swapper/419:36:334
2607421992521,3cyclictest1390-21snmpd23:27:573
2607421992518,5cyclictest0-21swapper/323:59:583
2607421992518,5cyclictest0-21swapper/322:12:453
2607421992518,5cyclictest0-21swapper/322:12:443
2607417992521,3cyclictest1390-21snmpd23:21:242
2607417992521,3cyclictest1390-21snmpd23:12:552
2607417992521,3cyclictest1390-21snmpd21:35:292
260741799250,23cyclictest0-21swapper/200:04:052
260741799250,1cyclictest0-21swapper/220:31:112
2607412992524,1cyclictest0-21swapper/119:58:311
2607412992522,2cyclictest1390-21snmpd23:24:141
2607412992521,3cyclictest1390-21snmpd21:12:251
2607412992521,3cyclictest1390-21snmpd20:43:441
260741299250,23cyclictest0-21swapper/119:32:541
2607407992521,3cyclictest1390-21snmpd22:34:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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