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2026-04-12 - 04:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Sun Apr 12, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2346321010,6sleep123467-21unixbench_multi20:02:561
2346321010,6sleep123467-21unixbench_multi20:02:561
248599940,6rtkit-daemon0-21swapper/117:17:411
248599940,6rtkit-daemon0-21swapper/117:17:411
3041099924,43cyclictest0-21swapper/022:18:510
3041099923,44cyclictest0-21swapper/021:57:400
30410999229,14cyclictest0-21swapper/020:57:520
3041099913,42cyclictest0-21swapper/022:07:330
3041099913,22cyclictest1801-21runrttasks22:42:490
3041099913,22cyclictest1801-21runrttasks22:42:490
3041099893,42cyclictest0-21swapper/020:27:440
3041099893,38cyclictest0-21swapper/022:16:460
30410998929,12cyclictest0-21swapper/021:07:360
3041099883,44cyclictest0-21swapper/020:07:410
3041099883,39cyclictest0-21swapper/021:52:320
3041099874,45cyclictest0-21swapper/021:30:400
30410998619,8cyclictest27564-21awk21:47:170
3041099834,12cyclictest0-21swapper/022:37:480
3041099824,27cyclictest0-21swapper/020:37:440
30410998211,13cyclictest0-21swapper/019:47:220
3041099813,37cyclictest0-21swapper/022:27:480
30410998017,13cyclictest19022-21grep19:07:440
30410997810,12cyclictest0-21swapper/019:31:300
248599760,7rtkit-daemon31551-21cut17:17:490
248599760,7rtkit-daemon31551-21cut17:17:490
3041299715,60cyclictest0-21swapper/221:17:512
3041299694,57cyclictest0-21swapper/222:42:482
3041299694,57cyclictest0-21swapper/222:42:482
3041299684,55cyclictest0-21swapper/219:52:512
248599670,8rtkit-daemon0-21swapper/321:05:553
248599670,5rtkit-daemon2484-21rtkit-daemon18:35:083
248599670,5rtkit-daemon0-21swapper/321:28:243
248599670,4rtkit-daemon2484-21rtkit-daemon18:21:243
248599660,9rtkit-daemon0-21swapper/320:12:423
248599660,9rtkit-daemon0-21swapper/320:03:203
248599660,9rtkit-daemon0-21swapper/320:03:203
248599660,9rtkit-daemon0-21swapper/318:43:303
248599660,9rtkit-daemon0-21swapper/318:43:303
248599660,9rtkit-daemon0-21swapper/318:22:463
248599660,8rtkit-daemon0-21swapper/322:35:513
248599660,8rtkit-daemon0-21swapper/321:58:383
248599660,7rtkit-daemon0-21swapper/318:54:373
248599660,7rtkit-daemon0-21swapper/317:35:103
248599660,6rtkit-daemon0-21swapper/322:14:523
248599660,6rtkit-daemon0-21swapper/319:42:283
248599660,6rtkit-daemon0-21swapper/319:00:003
248599660,6rtkit-daemon0-21swapper/318:08:323
248599660,6rtkit-daemon0-21swapper/318:00:093
248599660,4rtkit-daemon2484-21rtkit-daemon18:32:083
3041299654,54cyclictest0-21swapper/220:09:312
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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