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2025-12-22 - 12:42

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 Mon Dec 22, 2025 00:43:57)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
38662161102,55sleep30-21swapper/319:08:593
358528755,6sleep00-21swapper/019:05:310
380728552,9sleep20-21swapper/219:08:142
363028454,10sleep10-21swapper/119:06:011
4088992320,1cyclictest0-21swapper/323:55:003
4088992320,1cyclictest0-21swapper/323:54:593
4088992320,1cyclictest0-21swapper/322:45:133
4088992320,1cyclictest0-21swapper/319:44:193
2957942231,18sleep1296044-21tail23:40:281
408899222,15cyclictest159499-21chrt21:35:153
4088992115,3cyclictest206285-21turbostat22:20:003
408899211,16cyclictest106745-21taskset20:44:213
408899211,16cyclictest106745-21taskset20:44:203
408899210,17cyclictest15850irq/127-ahci[0000:00:17.0]00:20:123
4088992018,1cyclictest0-21swapper/323:35:193
4088992017,1cyclictest0-21swapper/323:15:163
4088992017,1cyclictest0-21swapper/323:00:013
4088992017,1cyclictest0-21swapper/300:35:153
4088992016,2cyclictest0-21swapper/323:05:223
4088992016,2cyclictest0-21swapper/319:15:243
4088992016,2cyclictest0-21swapper/300:30:233
408899201,14cyclictest127807-21sleep21:05:003
3171252201,5sleep0317174-21ntpq00:00:220
1749162201,5sleep0174933-21munin-run21:50:000
1749162201,5sleep0174933-21munin-run21:49:590
4088991916,1cyclictest0-21swapper/322:50:153
4088991815,1cyclictest0-21swapper/323:30:163
4088991815,1cyclictest0-21swapper/323:00:233
4088991815,1cyclictest0-21swapper/321:40:193
4088991815,1cyclictest0-21swapper/321:20:123
408899181,14cyclictest0-21swapper/300:00:123
408899181,12cyclictest174947-21sleep21:50:003
408899181,12cyclictest174947-21sleep21:49:593
408899181,12cyclictest143435-21taskset21:19:563
408899171,4cyclictest0-21swapper/320:45:133
4088991714,2cyclictest0-21swapper/323:25:163
4088991714,1cyclictest0-21swapper/322:35:173
4088991714,1cyclictest0-21swapper/320:25:253
4088991714,1cyclictest0-21swapper/320:20:163
4088991714,1cyclictest0-21swapper/320:15:193
4088991714,1cyclictest0-21swapper/300:10:013
408899171,13cyclictest0-21swapper/322:00:113
408899171,12cyclictest3446002sleep300:25:313
408899171,12cyclictest200172-21chrt22:10:233
408899171,12cyclictest149003-21chrt21:25:133
408899171,10cyclictest262339-21taskset23:10:183
408899171,10cyclictest211711-21taskset22:25:013
408899170,13cyclictest0-21swapper/322:30:123
408899170,13cyclictest0-21swapper/321:05:213
408899170,11cyclictest95755-21chrt20:31:273
408899167,5cyclictest310972sleep319:30:183
408899161,9cyclictest43263-21taskset19:45:013
408899161,4cyclictest0-21swapper/323:20:103
4088991614,1cyclictest0-21swapper/320:10:213
408899161,3cyclictest0-21swapper/322:40:123
4088991613,1cyclictest0-21swapper/319:50:133
4088991612,2cyclictest0-21swapper/320:55:193
4088991612,2cyclictest0-21swapper/319:35:173
4088991612,2cyclictest0-21swapper/319:35:163
408899161,12cyclictest96287-21chrt20:35:023
408899161,12cyclictest216799-21turbostat22:29:593
408899161,12cyclictest0-21swapper/319:20:213
408899161,11cyclictest58736-21turbostat20:00:013
408899161,11cyclictest138232-21sleep21:15:003
408899160,13cyclictest0-21swapper/323:40:193
408899160,13cyclictest0-21swapper/300:15:223
408899160,12cyclictest0-21swapper/323:55:123
408899160,10cyclictest158983-21taskset21:32:073
913402151,4sleep191550-21hddtemp_smartct20:30:141
852752151,3sleep185288-21latency_hist20:25:001
629942151,9sleep063041-21ntpq20:00:190
470922151,9sleep047233-21ntpq19:45:200
408899157,5cyclictest296487-21turbostat23:49:553
408899152,6cyclictest179931-21taskset21:52:143
408899151,9cyclictest328732-21taskset00:12:263
408899151,3cyclictest0-21swapper/320:05:113
4088991512,1cyclictest0-21swapper/319:10:163
408899151,11cyclictest0-21swapper/320:50:173
408899150,13cyclictest0-21swapper/319:25:163
408899150,12cyclictest0-21swapper/322:05:123
408899150,12cyclictest0-21swapper/321:55:203
24859921511,2sleep24165226-21kworker/2:1+events_freezable22:57:162
2336642151,9sleep1234753-21cut22:45:171
2167852151,9sleep0216908-21cat22:30:000
1594772151,3sleep2159496-21apt-get21:35:152
789862141,3sleep179028-21ntpq20:15:221
789072140,9sleep078985-21ld20:15:210
408899140,12cyclictest0-21swapper/320:00:143
2396062141,9sleep0241320-21grep22:50:160
1705372141,8sleep1171939-21cut21:45:171
1705372141,8sleep1171939-21cut21:45:161
1323252141,9sleep0132415-21sed21:05:270
1215922149,2sleep20-21swapper/220:55:242
94092131,7sleep110560-21kthreadcore19:15:011
273072132,5sleep027326-21apt-get19:30:130
2676412131,8sleep0268823-21memory23:15:170
632842121,7sleep263292-21sensors_temp20:00:242
580342121,7sleep258251-21unixbench_multi19:55:282
2846662121,2sleep00-21swapper/023:30:210
2566512121,7sleep2258354-21sed23:05:182
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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