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2025-10-19 - 01:22

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 Sat Oct 18, 2025 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2239421020,5chrt0-21swapper/006:09:300
2239421020,5chrt0-21swapper/006:09:300
18794999221,13cyclictest0-21swapper/107:39:411
18794999020,28cyclictest4822-21switchtime07:44:591
1879499894,28cyclictest0-21swapper/108:04:471
1879499885,27cyclictest0-21swapper/107:29:591
18794998824,19cyclictest18234-21unixbench_singl09:20:011
1879499874,27cyclictest0-21swapper/109:49:451
18794998721,12cyclictest0-21swapper/106:40:041
1879499864,28cyclictest0-21swapper/109:59:461
1879499854,28cyclictest0-21swapper/105:39:471
18794998434,9cyclictest10515-21head09:04:501
18794998431,11cyclictest12430-21fschecks_time09:09:421
1879499843,28cyclictest0-21swapper/107:19:521
18794998321,12cyclictest0-21swapper/106:14:301
1879499804,27cyclictest0-21swapper/109:14:351
1879499804,27cyclictest0-21swapper/106:56:101
18794997919,13cyclictest0-21swapper/106:30:031
262452770,37sleep00-21swapper/009:39:350
1879499774,27cyclictest0-21swapper/106:59:421
1879499774,26cyclictest0-21swapper/110:04:341
1879399764,62cyclictest0-21swapper/006:39:520
1879399684,12cyclictest5581-21sh05:34:310
223099660,5rtkit-daemon2229-21rtkit-daemon06:04:593
223099660,5rtkit-daemon2229-21rtkit-daemon06:04:593
18793996548,10cyclictest14711-21grep05:50:060
1879399654,53cyclictest0-21swapper/008:25:000
258842643,53sleep20-21swapper/208:29:492
1879399644,51cyclictest0-21swapper/006:59:290
1879399644,29cyclictest0-21swapper/007:53:110
276342624,50sleep00-21swapper/005:10:060
1879699624,39cyclictest0-21swapper/307:54:023
19472614,12sleep00-21swapper/005:24:570
18793996019,34cyclictest16625-21proc_pri08:09:540
18793996019,34cyclictest16625-21proc_pri08:09:540
223099590,4rtkit-daemon2229-21rtkit-daemon06:37:423
1879599594,12cyclictest0-21swapper/207:27:092
137722593,48sleep20-21swapper/210:19:442
137722593,48sleep20-21swapper/210:19:442
120102593,48sleep20-21swapper/207:59:582
223099580,4rtkit-daemon2229-21rtkit-daemon10:07:423
1879699584,36cyclictest0-21swapper/308:49:133
1879699584,36cyclictest0-21swapper/306:43:303
18793995839,11cyclictest20056-21grep09:24:490
1879699575,43cyclictest0-21swapper/309:59:243
1879599573,12cyclictest0-21swapper/209:39:472
1879599573,12cyclictest0-21swapper/208:49:452
1879599573,12cyclictest0-21swapper/208:49:452
1879599573,11cyclictest0-21swapper/210:04:332
60292563,45sleep20-21swapper/207:49:422
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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