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2025-12-05 - 21:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Fri Dec 05, 2025 12:43:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2682420212755,66sleep30-21swapper/307:05:003
268295828762,20sleep00-21swapper/007:08:420
268298428554,9sleep10-21swapper/107:09:031
268290227759,10sleep20-21swapper/207:07:592
2683285994136,2cyclictest0-21swapper/310:20:003
2683285992825,1cyclictest0-21swapper/307:37:233
2683285992824,2cyclictest0-21swapper/311:36:543
268328599272,16cyclictest2873202-21taskset10:35:273
27993892261,20sleep02738803-21diskmemload09:49:190
2683285992623,1cyclictest0-21swapper/309:25:003
30560162250,8sleep02738803-21diskmemload12:35:280
268328599241,17cyclictest3018973-21chrt12:15:133
2683285992320,2cyclictest0-21swapper/309:55:183
2683285992319,2cyclictest0-21swapper/310:20:173
2683285992317,3cyclictest0-21swapper/312:35:133
268328599231,18cyclictest2692584-21taskset07:25:033
27974792221,10sleep12797489-21ssh09:45:431
268328599222,14cyclictest3027181-21taskset12:20:023
268328599222,14cyclictest2904813-21taskset10:57:593
268328599222,14cyclictest2883979-21taskset10:45:123
268328599222,13cyclictest2797539-21taskset09:45:473
2683285992219,1cyclictest0-21swapper/307:35:013
2683285992218,2cyclictest0-21swapper/312:35:013
2683285992218,2cyclictest0-21swapper/312:05:163
2683285992218,2cyclictest0-21swapper/309:40:233
268328599220,18cyclictest2920405-21taskset11:09:333
268328599214,14cyclictest28808452chrt10:40:243
268328599212,13cyclictest2827737-21taskset10:05:313
268328599212,12cyclictest2971169-21taskset11:41:093
2683285992118,1cyclictest0-21swapper/309:50:123
2683285992116,3cyclictest0-21swapper/312:00:153
268328599211,16cyclictest2835869-21taskset10:11:503
29046002201,2sleep00-21swapper/010:57:380
268328599202,13cyclictest2956181-21taskset11:32:153
268328599202,12cyclictest3042265-21taskset12:29:003
268328599202,12cyclictest2974035-21taskset11:45:143
2683285992016,2cyclictest0-21swapper/311:00:153
2683285992016,2cyclictest0-21swapper/310:35:013
2683285992015,2cyclictest0-21swapper/309:10:143
268328599201,16cyclictest2692196-21chrt07:23:193
268328599201,16cyclictest0-21swapper/309:35:553
2683285992010,7cyclictest2857616-21taskset10:25:253
28583912193,5sleep1171rcu_preempt10:26:121
2683285991915,2cyclictest0-21swapper/312:10:203
268328599191,14cyclictest2746749-21chrt09:15:053
268328599191,14cyclictest0-21swapper/311:19:013
268328599191,14cyclictest0-21swapper/311:10:103
268328599191,13cyclictest2761705-21chrt09:25:033
268328599191,13cyclictest2761705-21chrt09:25:033
30333702181,11sleep13033383-21ssh12:22:301
28697232181,13sleep12871383-21grep10:35:181
28288862181,2sleep10-21swapper/110:07:441
27134842181,8sleep22715155-21grep08:10:172
268328599182,12cyclictest2993924-21taskset11:56:013
2683285991815,1cyclictest0-21swapper/311:53:543
2683285991814,2cyclictest0-21swapper/310:50:163
2683285991814,2cyclictest0-21swapper/309:30:133
268328599181,14cyclictest0-21swapper/311:25:003
268328599181,14cyclictest0-21swapper/311:23:253
268328599181,13cyclictest2719383-21chrt08:25:103
268328599181,10cyclictest2712666-21taskset08:09:593
30092982171,11sleep03009307-21ssh12:07:040
29470532171,2sleep00-21swapper/011:25:200
28437242171,3sleep10-21swapper/110:17:101
28067682170,9sleep12806778-21ssh09:53:561
27753712171,2sleep20-21swapper/209:33:212
27693612172,9sleep12769526-21expr09:30:151
27609752171,10sleep22738803-21diskmemload09:24:112
2683285991714,1cyclictest0-21swapper/308:11:543
2683285991714,1cyclictest0-21swapper/307:10:153
268328599171,13cyclictest0-21swapper/310:00:473
268328599171,12cyclictest2691697-21turbostat07:19:593
268328599171,10cyclictest2705195-21chrt07:48:593
2683285991710,4cyclictest2726339-21chrt08:40:143
30416612161,2sleep00-21swapper/012:28:020
29359112161,11sleep12935992-21irqstats11:20:161
28361362161,4sleep22738803-21diskmemload10:12:182
28062802161,2sleep20-21swapper/209:53:062
27834562161,3sleep00-21swapper/009:38:570
27581532160,10sleep12758299-21ntpq09:20:171
27537442161,3sleep02738803-21diskmemload09:19:470
27299802161,10sleep12730038-21collect208:40:211
268328599161,9cyclictest2738406-21taskset09:05:063
268328599161,9cyclictest2711584-21taskset08:01:353
2683285991613,1cyclictest0-21swapper/307:57:533
268328599161,11cyclictest2699583-21chrt07:40:113
268328599161,10cyclictest2725364-21taskset08:36:333
30500342151,3sleep00-21swapper/012:33:390
30351352151,2sleep10-21swapper/112:25:011
30265252151,9sleep03026537-21ssh12:19:510
30189422153,6sleep23018962-21apt-get12:15:122
29866402150,3sleep22738803-21diskmemload11:50:562
29709442151,2sleep10-21swapper/111:40:481
29632862151,10sleep22963296-21ssh11:36:112
28882192159,3sleep12888300-21pmu-power10:45:241
28769612151,9sleep12878418-21kthreadcore10:40:141
28582542151,9sleep22738803-21diskmemload10:25:572
28447772150,3sleep22738803-21diskmemload10:19:072
27234432151,9sleep02723516-21grep08:25:210
268328599151,9cyclictest2737212-21taskset08:56:333
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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