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2026-09-08 - 04:58

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 Tue Sep 08, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
219499750,6rtkit-daemon0-21swapper/319:59:513
1725999675,55cyclictest0-21swapper/020:40:210
1725999675,55cyclictest0-21swapper/020:40:210
1726399655,26cyclictest0-21swapper/219:54:392
17259996542,16cyclictest24301-21tune2fs19:54:230
127592645,6sleep20-21swapper/219:37:322
38792634,51sleep20-21swapper/222:39:152
17259996330,14cyclictest0-21swapper/021:14:170
12052630,14sleep01725999cyclictest20:09:140
1726599622,23cyclictest0-21swapper/320:20:473
17261996233,12cyclictest0-21swapper/119:54:171
86522613,50sleep28755-21ssh20:19:212
1726199614,50cyclictest0-21swapper/121:16:431
219499600,9rtkit-daemon2193-21rtkit-daemon22:20:152
17261996037,11cyclictest0-21swapper/121:04:351
17261996034,13cyclictest0-21swapper/121:53:561
1726199603,50cyclictest9368-21munin-node21:09:191
223112593,48sleep30-21swapper/322:19:083
17261995934,11cyclictest0-21swapper/122:49:181
17261995934,11cyclictest0-21swapper/122:49:181
17261995933,12cyclictest0-21swapper/122:39:221
17261995932,12cyclictest0-21swapper/120:19:141
1726199593,50cyclictest18625-21munin-node18:44:201
1725999593,51cyclictest0-21swapper/022:49:360
1725999593,51cyclictest0-21swapper/022:49:360
141062594,12sleep30-21swapper/321:16:263
137032593,50sleep30-21swapper/320:27:163
235792583,47sleep20-21swapper/221:29:522
219499580,4rtkit-daemon2193-21rtkit-daemon20:51:192
1726199584,47cyclictest0-21swapper/120:29:251
17261995833,12cyclictest0-21swapper/119:34:261
1726199583,49cyclictest0-21swapper/120:34:201
17261995827,11cyclictest0-21swapper/120:02:341
1726199582,51cyclictest0-21swapper/120:59:151
77002573,7sleep07730-21latency18:19:300
325412572,48sleep00-21swapper/019:12:020
219499570,3rtkit-daemon2193-21rtkit-daemon21:09:482
17265995741,9cyclictest27622-21fschecks_count17:54:253
1726399573,48cyclictest0-21swapper/221:54:202
17263995717,24cyclictest1556-21nscd18:44:042
1726199577,42cyclictest0-21swapper/121:28:591
1726199577,42cyclictest0-21swapper/121:28:591
1726199575,46cyclictest0-21swapper/122:30:111
1726199574,47cyclictest0-21swapper/122:16:251
1726199574,46cyclictest0-21swapper/120:04:361
17261995734,12cyclictest0-21swapper/122:08:231
17261995730,14cyclictest0-21swapper/120:10:311
1726199573,48cyclictest0-21swapper/122:24:241
1725999573,21cyclictest0-21swapper/021:44:210
17259995729,13cyclictest0-21swapper/019:04:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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