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2026-03-21 - 15:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Sat Mar 21, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40662852248174,24sleep50-21swapper/507:06:215
40664582230171,46sleep10-21swapper/107:08:501
40663522230166,21sleep70-21swapper/707:07:197
40664542223163,48sleep60-21swapper/607:08:476
40663222222185,24sleep40-21swapper/407:06:534
40662832219185,22sleep30-21swapper/307:06:193
40662732219165,17sleep20-21swapper/207:06:102
40662892212178,21sleep00-21swapper/007:06:240
4066776992725,2cyclictest63342-21cron12:40:004
4066769992621,5cyclictest0-21swapper/110:05:121
406678299250,24cyclictest0-21swapper/609:45:136
406678299250,21cyclictest40952-21apt-get12:00:116
406678299250,18cyclictest0-21swapper/612:15:106
406676999250,24cyclictest38079-21apt-get11:55:111
4066765992524,0cyclictest0-21swapper/008:05:000
406678299240,24cyclictest4139750-21apt-get09:15:116
4066776992423,1cyclictest0-21swapper/410:45:114
4066776992423,0cyclictest0-21swapper/408:35:134
406677699240,23cyclictest4159589-21idleruntime-cro09:50:004
406677499240,23cyclictest4084814-21awk07:40:003
406677499240,23cyclictest0-21swapper/309:00:123
406677199240,23cyclictest0-21swapper/209:30:002
406676999242,21cyclictest43388-21perf12:05:011
406676999240,23cyclictest4188487-21perf10:40:001
406676599240,23cyclictest0-21swapper/010:25:130
4066782992321,2cyclictest0-21swapper/610:10:116
406678299230,22cyclictest0-21swapper/610:25:136
406678299230,22cyclictest0-21swapper/609:25:016
406678299230,22cyclictest0-21swapper/609:20:116
406678299230,22cyclictest0-21swapper/608:15:116
4066780992322,0cyclictest0-21swapper/509:35:115
406678099230,2cyclictest4142217-21idleruntime-cro09:20:005
406678099230,23cyclictest29108-21sendmail11:40:005
406677699230,23cyclictest0-21swapper/410:20:004
406677699230,22cyclictest0-21swapper/408:00:124
406677499230,22cyclictest0-21swapper/311:10:123
406677499230,1cyclictest4090515-21munin-run07:50:003
4066771992321,2cyclictest35230-21apt-get11:50:122
406677199230,22cyclictest0-21swapper/208:45:002
4066769992322,1cyclictest0-21swapper/107:30:011
406676999230,22cyclictest0-21swapper/107:15:121
4066765992321,1cyclictest4186045-21apt-get10:35:110
406676599230,22cyclictest0-21swapper/012:15:100
4066785992222,0cyclictest4176529-21updatedb.plocat10:16:537
406678599220,22cyclictest0-21swapper/708:45:017
406678599220,21cyclictest0-21swapper/712:05:117
406678599220,21cyclictest0-21swapper/707:40:007
406678599220,1cyclictest4131200-21apt-get09:00:117
4066782992220,1cyclictest4085235-21apt-get07:40:126
4066782992218,1cyclictest4136899-21apt-get09:10:116
406678299220,22cyclictest49084-21munin-run12:15:006
406678299220,21cyclictest4174340-21apt-get10:15:126
406678299220,21cyclictest0-21swapper/608:55:116
406678299220,21cyclictest0-21swapper/608:35:126
406678299220,0cyclictest0-21swapper/609:40:126
4066780992219,3cyclictest4122484-21sed08:45:005
406678099220,22cyclictest0-21swapper/510:15:125
406678099220,0cyclictest0-21swapper/510:20:135
4066776992220,1cyclictest0-21swapper/409:25:004
4066776992220,1cyclictest0-21swapper/407:15:004
406677699220,22cyclictest581rcuc/409:00:004
406677699220,21cyclictest0-21swapper/411:10:124
406677699220,21cyclictest0-21swapper/409:30:134
406677699220,1cyclictest52379-21apt-get12:20:134
4066774992220,1cyclictest4153862-21sh09:40:003
4066774992220,1cyclictest0-21swapper/310:25:143
4066774992220,1cyclictest0-21swapper/309:40:113
406677499220,21cyclictest4099509-21apt-get08:05:123
406677499220,21cyclictest0-21swapper/312:15:093
406677499220,21cyclictest0-21swapper/311:20:123
406677499220,21cyclictest0-21swapper/310:55:133
406677499220,21cyclictest0-21swapper/309:50:113
406677499220,21cyclictest0-21swapper/308:20:123
406677499220,21cyclictest0-21swapper/307:10:133
406677499220,0cyclictest0-21swapper/307:40:113
4066771992221,1cyclictest0-21swapper/209:50:112
4066771992221,1cyclictest0-21swapper/208:15:102
4066771992220,1cyclictest63388-21tr12:40:002
4066771992220,1cyclictest0-21swapper/212:10:002
406677199220,21cyclictest4157168-21apt-get09:45:132
406677199220,21cyclictest0-21swapper/212:25:182
406677199220,21cyclictest0-21swapper/212:20:002
406677199220,21cyclictest0-21swapper/209:55:132
406677199220,1cyclictest4113788-21apt-get08:30:102
406677199220,1cyclictest0-21swapper/207:30:002
406677199220,0cyclictest0-21swapper/207:55:132
4066769992221,1cyclictest4185628-21munin-run10:35:001
4066769992220,1cyclictest0-21swapper/109:55:141
406676999220,21cyclictest0-21swapper/111:10:131
406676999220,21cyclictest0-21swapper/110:45:111
406676999220,21cyclictest0-21swapper/109:50:111
406676999220,21cyclictest0-21swapper/107:35:101
406676999220,1cyclictest4191369-21awk10:45:001
406676999220,1cyclictest0-21swapper/108:45:001
406676999220,0cyclictest0-21swapper/110:25:131
4066765992220,1cyclictest4073078-21dump-pmu-power07:20:000
4066765992220,1cyclictest0-21swapper/008:30:000
406676599220,21cyclictest0-21swapper/011:30:100
406676599220,21cyclictest0-21swapper/010:05:120
406676599220,1cyclictest0-21swapper/012:20:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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