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2026-06-12 - 21:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Fri Jun 12, 2026 12:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1196221450,2sleep33014099cyclictest10:53:153
29930211397,11sleep30-21swapper/307:07:433
29901210789,13sleep10-21swapper/107:07:211
28325210477,20sleep00-21swapper/007:05:120
29914210378,6sleep20-21swapper/207:07:302
169922830,1sleep2301ktimersoftd/212:09:222
263712660,0sleep30-21swapper/309:23:363
74542510,0sleep00-21swapper/008:55:110
73022330,1sleep00-21swapper/011:58:300
240202260,0sleep10-21swapper/111:05:481
219242260,6sleep23013999cyclictest09:18:582
3013899231,12cyclictest0-21swapper/110:40:411
3013799230,17cyclictest0-21swapper/011:05:090
3013999220,20cyclictest13464-21munin-node2
3013899220,12cyclictest0-21swapper/110:04:591
30140992116,3cyclictest11254-21kworker/u8:209:43:043
3014099211,18cyclictest0-21swapper/309:30:123
3013999211,8cyclictest27148-21munin-node2
3013999211,18cyclictest0-21swapper/207:50:152
30138992110,3cyclictest3259-21chrt10:09:231
3013899210,3cyclictest0-21swapper/111:40:171
30140992016,3cyclictest1267-21kworker/u8:111:32:043
30140992016,2cyclictest8303-21kworker/u8:109:18:043
30140992016,2cyclictest0-21swapper/311:25:103
3014099201,17cyclictest0-21swapper/312:10:093
30139992016,2cyclictest0-21swapper/211:05:082
3013999200,18cyclictest0-21swapper/212:36:592
3013999200,18cyclictest0-21swapper/210:16:022
3013899203,7cyclictest8013-21copy07:35:001
3013899202,12cyclictest0-21swapper/107:17:021
3013899200,12cyclictest28253-21taskset11:45:271
3014099192,2cyclictest0-21swapper/312:34:053
3013999190,8cyclictest0-21swapper/212:25:382
3013999190,17cyclictest13378-21ssh09:10:102
3013999190,17cyclictest0-21swapper/210:43:572
3013999190,17cyclictest0-21swapper/209:53:492
30138991910,2cyclictest24532-21smartctl09:21:021
30138991910,2cyclictest13080-21diskmemload10:11:161
3013899190,11cyclictest0-21swapper/111:10:491
3013799190,2cyclictest0-21swapper/008:45:120
3013799190,17cyclictest17909-21ssh11:35:110
204402190,0sleep30-21swapper/309:51:573
30140991815,2cyclictest29221-21kworker/u8:010:20:053
3013999180,7cyclictest0-21swapper/209:25:082
3013999180,17cyclictest0-21swapper/211:37:022
3013999180,17cyclictest0-21swapper/211:10:052
3013999180,16cyclictest0-21swapper/212:16:242
3013999180,16cyclictest0-21swapper/210:32:332
3013999180,16cyclictest0-21swapper/210:21:062
3013899182,7cyclictest0-21swapper/110:55:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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