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2026-05-23 - 10:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Sat May 23, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19423993231,1cyclictest1553-21lspci21:56:290
19425992828,0cyclictest0-21swapper/221:56:282
1942699250,24cyclictest0-21swapper/323:59:363
1942699250,24cyclictest0-21swapper/321:51:283
1942699250,24cyclictest0-21swapper/300:23:403
19425992523,1cyclictest0-21swapper/221:37:552
1942499250,25cyclictest10200-21ssh21:35:461
1942499250,1cyclictest12754-21diskmemload23:17:511
1942399250,1cyclictest30069-21cut23:17:550
19426992423,0cyclictest0-21swapper/323:23:293
1942699240,2cyclictest1437-21ls19:40:003
19425992424,0cyclictest0-21swapper/222:05:082
19425992422,2cyclictest31566-21sh23:18:532
1942599240,23cyclictest0-21swapper/222:52:342
1942599240,23cyclictest0-21swapper/222:47:332
1942599240,23cyclictest0-21swapper/222:22:452
1942599240,23cyclictest0-21swapper/221:24:042
1942599240,23cyclictest0-21swapper/200:20:012
1942599240,23cyclictest0-21swapper/200:02:492
1942599240,0cyclictest12754-21diskmemload22:33:322
19424992423,1cyclictest3789-21ssh22:26:281
19424992422,1cyclictest19987-21sh21:16:541
1942499240,23cyclictest30494-21apt-get23:47:511
1942499240,23cyclictest12754-21diskmemload00:15:191
1942499240,23cyclictest0-21swapper/123:52:531
1942499240,0cyclictest0-21swapper/123:06:071
19423992423,1cyclictest13808-21ssh21:38:140
1942399240,24cyclictest0-21swapper/023:48:400
1942399240,24cyclictest0-21swapper/022:46:330
1942399240,24cyclictest0-21swapper/021:15:510
1942399240,0cyclictest12754-21diskmemload22:20:540
19426992323,0cyclictest12754-21diskmemload22:28:543
19426992323,0cyclictest12754-21diskmemload21:30:543
19426992323,0cyclictest0-21swapper/323:13:143
19426992323,0cyclictest0-21swapper/323:13:143
19426992323,0cyclictest0-21swapper/323:02:283
19426992323,0cyclictest0-21swapper/322:23:573
19426992323,0cyclictest0-21swapper/322:06:453
19426992322,1cyclictest12754-21diskmemload22:19:223
19426992321,1cyclictest11956-21apt-get22:05:003
1942699230,2cyclictest2072-21sh23:50:023
1942699230,23cyclictest12754-21diskmemload23:18:293
1942699230,23cyclictest0-21swapper/323:43:273
1942699230,23cyclictest0-21swapper/322:47:193
1942699230,23cyclictest0-21swapper/322:35:033
1942699230,22cyclictest19654-21fschecks_count23:37:513
1942699230,22cyclictest1886-21runrttasks00:18:073
1942699230,22cyclictest13502-21rm00:00:073
1942699230,22cyclictest11086-21dump-pmu-power20:00:013
1942699230,0cyclictest0-21swapper/321:15:493
1942699230,0cyclictest0-21swapper/300:09:103
19425992323,0cyclictest0-21swapper/223:50:502
19425992323,0cyclictest0-21swapper/200:31:252
19425992323,0cyclictest0-21swapper/200:06:292
19425992322,1cyclictest12754-21diskmemload22:10:152
19425992322,0cyclictest0-21swapper/223:12:132
19425992322,0cyclictest0-21swapper/223:12:132
1942599232,20cyclictest0-21swapper/221:18:052
19425992321,1cyclictest0-21swapper/223:01:552
19425992321,1cyclictest0-21swapper/221:31:422
19425992321,1cyclictest0-21swapper/221:27:252
19425992321,1cyclictest0-21swapper/200:13:232
1942599230,23cyclictest0-21swapper/222:40:402
1942599230,23cyclictest0-21swapper/221:50:112
1942599230,22cyclictest8442-21diskmemload23:56:122
1942599230,22cyclictest18803-21ssh23:37:242
1942599230,22cyclictest14681-21awk00:30:002
1942599230,0cyclictest0-21swapper/223:46:192
1942599230,0cyclictest0-21swapper/222:25:372
19424992323,0cyclictest12754-21diskmemload22:30:581
19424992323,0cyclictest0-21swapper/122:55:041
19424992323,0cyclictest0-21swapper/121:41:181
19424992323,0cyclictest0-21swapper/100:35:011
19424992323,0cyclictest0-21swapper/100:01:141
19424992322,1cyclictest0-21swapper/123:44:411
19424992321,1cyclictest0-21swapper/123:59:361
19424992321,1cyclictest0-21swapper/121:26:421
19424992320,2cyclictest15807-21sh22:37:211
1942499230,2cyclictest2073-21ssh22:24:271
1942499230,23cyclictest0-21swapper/123:30:051
1942499230,23cyclictest0-21swapper/123:00:131
1942499230,23cyclictest0-21swapper/122:48:531
1942499230,23cyclictest0-21swapper/122:40:281
1942499230,23cyclictest0-21swapper/100:22:411
1942499230,22cyclictest24416-21ssh22:15:491
1942499230,22cyclictest19969-21ssh00:34:391
1942499230,22cyclictest19337-21ssh00:05:201
1942499230,22cyclictest0-21swapper/122:50:301
1942499230,22cyclictest0-21swapper/121:20:571
1942499230,1cyclictest686-21apt20:45:001
1942499230,0cyclictest0-21swapper/123:10:071
1942499230,0cyclictest0-21swapper/123:10:071
1942499230,0cyclictest0-21swapper/122:10:351
19423992323,0cyclictest12754-21diskmemload23:00:330
19423992323,0cyclictest0-21swapper/023:40:390
19423992323,0cyclictest0-21swapper/000:16:330
19423992323,0cyclictest0-21swapper/000:13:320
19423992321,2cyclictest16054-21kworker/u8:121:45:200
19423992321,1cyclictest20756-21ssh22:41:170
19423992320,2cyclictest15258-21ssh00:30:350
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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