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2026-03-27 - 22:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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 rack5slot3s.osadl.org (updated Fri Mar 27, 2026 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
278172233163,57sleep10-21swapper/107:06:001
280392230161,56sleep20-21swapper/207:08:552
279432202165,25sleep30-21swapper/307:07:383
277842200165,24sleep00-21swapper/007:05:350
797121530,4sleep12821799cyclictest12:30:011
28231998076,3cyclictest0-21swapper/312:03:563
28231998076,3cyclictest0-21swapper/310:38:023
28231998076,3cyclictest0-21swapper/307:39:323
137242760,5sleep32823199cyclictest09:00:193
28231997571,3cyclictest0-21swapper/310:52:013
28231997571,3cyclictest0-21swapper/310:52:013
28231997268,3cyclictest0-21swapper/312:16:463
28231997066,3cyclictest0-21swapper/312:32:393
225682680,2sleep30-21swapper/309:20:173
28231995855,2cyclictest0-21swapper/311:54:303
296102540,4sleep011-21rcuc/012:05:120
28231994945,3cyclictest0-21swapper/310:20:223
199382480,2sleep230-21rcuc/209:15:142
74292450,4sleep07433-21switchtime08:45:230
28217994024,10cyclictest0-21swapper/110:40:141
2823199382,24cyclictest18866-21kworker/3:111:49:513
2823199381,28cyclictest18866-21kworker/3:109:27:023
2821199368,13cyclictest3737-21munin-run08:40:010
2821199358,12cyclictest18167-21awk11:40:000
2821199358,12cyclictest10331-21awk08:55:020
28211993510,12cyclictest32315-21munin-run09:45:010
28211993510,12cyclictest32315-21munin-run09:45:010
28231993422,2cyclictest18866-21kworker/3:109:42:183
28231993422,2cyclictest18866-21kworker/3:109:42:183
2822599341,24cyclictest0-21swapper/208:31:572
2822599341,24cyclictest0-21swapper/208:31:572
2823199331,23cyclictest0-21swapper/311:34:483
2821799330,11cyclictest0-21swapper/112:30:541
2821799330,10cyclictest0-21swapper/111:01:031
28231993216,2cyclictest18866-21kworker/3:107:29:303
2823199321,23cyclictest0-21swapper/310:27:163
2823199321,23cyclictest0-21swapper/309:47:543
2822599321,13cyclictest0-21swapper/208:45:402
2821799320,12cyclictest0-21swapper/112:02:261
2823199311,23cyclictest0-21swapper/312:07:063
2823199311,23cyclictest0-21swapper/311:59:023
2822599301,14cyclictest0-21swapper/208:16:532
2822599300,23cyclictest0-21swapper/209:03:122
2821799304,3cyclictest0-21swapper/110:33:221
28217993020,3cyclictest377-21smart_sda12:10:221
2821799301,20cyclictest0-21swapper/110:25:121
2823199292,10cyclictest18866-21kworker/3:108:48:193
2822599291,11cyclictest0-21swapper/207:21:252
2822599290,10cyclictest0-21swapper/208:04:212
2821799291,6cyclictest0-21swapper/109:59:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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