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2026-05-24 - 13:22

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 100 highest latencies:
System rack5slot3s.osadl.org (updated Sun May 24, 2026 00:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
108172240165,24sleep10-21swapper/119:09:451
105642203165,25sleep30-21swapper/319:06:303
88702202165,24sleep20-21swapper/219:05:032
107242202164,26sleep00-21swapper/019:08:320
3128521750,4sleep31093899cyclictest21:05:253
3128521750,4sleep31093899cyclictest21:05:253
2118121450,6sleep21093499cyclictest20:45:012
1093499103100,2cyclictest0-21swapper/222:29:112
151012630,3sleep01092299cyclictest22:55:250
304472610,3sleep20-21swapper/221:05:162
304472610,3sleep20-21swapper/221:05:162
194742560,2sleep10-21swapper/120:40:151
147772440,4sleep121-21rcuc/122:55:231
1093899421,32cyclictest0-21swapper/300:35:213
10938994127,6cyclictest0-21swapper/321:04:113
1093499411,29cyclictest0-21swapper/220:35:032
1093899401,14cyclictest0-21swapper/319:15:043
10938993923,6cyclictest0-21swapper/320:11:103
1092899390,13cyclictest0-21swapper/122:40:171
10938993810,11cyclictest0-21swapper/321:30:273
10938993726,3cyclictest0-21swapper/320:28:343
1093499371,26cyclictest0-21swapper/221:56:302
1092299377,14cyclictest24777-21munin-run19:40:010
76832360,4sleep21093499cyclictest22:40:152
10938993617,8cyclictest7269-21uname21:25:193
1093899361,27cyclictest13071-21vmstat22:50:263
10934993633,2cyclictest0-21swapper/221:40:112
1093499361,24cyclictest0-21swapper/220:50:312
10938993523,3cyclictest0-21swapper/320:57:193
10938993517,11cyclictest0-21swapper/319:29:433
1093899351,27cyclictest0-21swapper/319:55:433
1093899351,27cyclictest0-21swapper/319:55:423
1093899351,23cyclictest0-21swapper/322:21:503
10938993512,10cyclictest26072-21ntp_states19:40:233
10934993532,2cyclictest0-21swapper/222:52:192
1093899349,10cyclictest0-21swapper/320:43:103
10938993412,9cyclictest14013-21df_inode22:55:153
1093899341,26cyclictest0-21swapper/323:51:153
1093899341,20cyclictest0-21swapper/320:47:233
1093899341,20cyclictest0-21swapper/320:08:583
1093899341,13cyclictest0-21swapper/322:17:143
1093499341,25cyclictest0-21swapper/220:48:072
1093499341,23cyclictest0-21swapper/220:01:582
1092899341,8cyclictest0-21swapper/100:05:541
108892340,4sleep011-21rcuc/021:35:120
10938993313,11cyclictest0-21swapper/322:05:023
1093899331,26cyclictest0-21swapper/320:37:543
1093899331,24cyclictest0-21swapper/319:45:073
1093899331,23cyclictest0-21swapper/319:14:423
1093899331,21cyclictest0-21swapper/320:34:023
1093899330,26cyclictest0-21swapper/322:49:263
1092299336,12cyclictest10634-21perf21:35:020
10938993213,10cyclictest0-21swapper/323:46:553
10938993212,8cyclictest0-21swapper/320:23:303
1093899321,24cyclictest0-21swapper/321:49:583
10938993212,3cyclictest0-21swapper/320:52:113
1093899321,22cyclictest0-21swapper/322:12:583
1093899321,13cyclictest0-21swapper/323:43:433
1093899320,26cyclictest0-21swapper/323:58:273
1093899320,26cyclictest0-21swapper/321:50:463
1093899320,24cyclictest0-21swapper/300:06:033
1092899321,24cyclictest0-21swapper/119:25:281
1092299327,12cyclictest18483-21munin-run00:20:010
301252310,4sleep21093499cyclictest23:30:242
10938993115,11cyclictest0-21swapper/300:19:173
1093899311,22cyclictest0-21swapper/321:16:433
1093899311,22cyclictest0-21swapper/319:53:113
1093899311,21cyclictest839-21lldpd23:31:033
1093899311,18cyclictest0-21swapper/300:03:133
1093899311,17cyclictest0-21swapper/321:43:273
1093899311,14cyclictest0-21swapper/322:39:143
1093899311,13cyclictest0-21swapper/319:37:153
1093899311,13cyclictest0-21swapper/319:33:073
1093899310,23cyclictest0-21swapper/323:05:153
10934993128,2cyclictest0-21swapper/223:44:122
1092899312,14cyclictest16365-40dnf20:32:091
1093899301,23cyclictest0-21swapper/323:25:473
1093899301,23cyclictest0-21swapper/322:04:503
1093899301,20cyclictest0-21swapper/322:40:223
1093899301,15cyclictest0-21swapper/300:32:313
1093899301,15cyclictest0-21swapper/300:32:313
1093899301,15cyclictest0-21swapper/300:21:153
1093899301,14cyclictest0-21swapper/320:19:303
1093899301,13cyclictest0-21swapper/323:20:513
1093899301,13cyclictest0-21swapper/323:20:513
1093899301,11cyclictest23165-21grep23:15:193
1093899301,11cyclictest0-21swapper/323:03:433
10938993010,8cyclictest0-21swapper/322:25:063
1093499301,12cyclictest0-21swapper/220:05:182
1093499300,23cyclictest0-21swapper/222:19:432
1093499300,16cyclictest0-21swapper/223:59:382
1093499300,13cyclictest0-21swapper/221:46:302
1092899301,23cyclictest0-21swapper/122:11:131
1093899291,15cyclictest0-21swapper/321:20:033
1093899291,13cyclictest0-21swapper/321:56:183
1093899291,13cyclictest0-21swapper/321:11:473
1093899290,11cyclictest0-21swapper/319:21:393
1093499291,13cyclictest0-21swapper/222:01:072
1093499291,11cyclictest0-21swapper/219:56:062
1093499291,11cyclictest0-21swapper/219:56:062
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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