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2026-03-16 - 06:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 here to display the system's profile data or here to proceed to next system.
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 rack0slot5s.osadl.org (updated Mon Mar 16, 2026 00:45:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1847052388364,13sleep00-21swapper/019:07:510
1847782360311,13sleep30-21swapper/319:08:599
1847602341316,13sleep20-21swapper/219:08:428
1846442340315,13sleep90-21swapper/919:06:5615
1846312340316,12sleep130-21swapper/1319:06:445
1846282340315,13sleep100-21swapper/1019:06:412
1845502340314,14sleep150-21swapper/1519:05:427
1846252338312,14sleep70-21swapper/719:06:3813
1846042338312,14sleep50-21swapper/519:06:2011
1847262336311,13sleep40-21swapper/419:08:1110
1846892336312,12sleep10-21swapper/119:07:361
1845602336311,13sleep80-21swapper/819:05:5114
1848252335310,13sleep140-21swapper/1419:09:426
1846132335311,13sleep120-21swapper/1219:06:264
1847982334307,14sleep60-21swapper/619:09:1812
1847162334308,14sleep110-21swapper/1119:08:023
5853002520,0sleep40-21swapper/400:14:5910
2781452490,0sleep30-21swapper/320:20:009
5973662450,0sleep40-21swapper/400:20:2010
3412282450,0sleep100-21swapper/1021:05:142
3412282450,0sleep100-21swapper/1021:05:142
3593752420,0sleep90-21swapper/921:20:1015
3548502420,1sleep5614-21plymouthd21:15:1811
6178052410,0sleep140-21swapper/1400:39:596
4627362410,0sleep120-21swapper/1222:40:044
18523299412,38cyclictest3689936-21qemu-system-x8622:15:457
185218994040,0cyclictest0-21swapper/1119:12:313
3798402390,0sleep130-21swapper/1321:35:115
2257552360,0sleep60-21swapper/619:39:5912
185199993632,2cyclictest3689947-21CPU12
185232993522,13cyclictest159526-21kworker/15:219:35:237
185232993421,13cyclictest0-21swapper/1522:38:437
185213993431,1cyclictest3689947-21CPU2
18523299339,11cyclictest0-21swapper/1521:18:357
18523299328,0cyclictest0-21swapper/1520:44:017
185205993232,0cyclictest0-21swapper/819:12:3114
18522299311,2cyclictest3689953-21CPU4
18520399311,2cyclictest3689952-21CPU13
18522999280,27cyclictest186212-21ntpq19:10:016
185218992827,1cyclictest1623-21snmpd23:26:563
185210992827,1cyclictest1623-21snmpd22:08:0015
185205992827,1cyclictest1623-21snmpd22:45:5514
185205992824,2cyclictest3689953-21CPU14
185191992827,1cyclictest1623-21snmpd21:43:3410
185232992726,1cyclictest1623-21snmpd19:42:417
18523299272,25cyclictest0-21swapper/1520:55:317
18523299270,27cyclictest0-21swapper/1523:51:187
185224992726,1cyclictest1623-21snmpd19:59:365
18522499270,27cyclictest0-21swapper/1320:15:295
185222992726,1cyclictest1623-21snmpd21:58:024
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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