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2026-05-13 - 23:22

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 Wed May 13, 2026 12:44:41)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29379622229191,25sleep10-21swapper/107:09:591
29377592228190,25sleep70-21swapper/707:07:087
29378532224190,22sleep00-21swapper/007:08:290
29377112224184,25sleep60-21swapper/607:06:266
29377192220191,19sleep50-21swapper/507:06:345
29376912220187,22sleep40-21swapper/407:06:094
29379032219183,23sleep30-21swapper/307:09:133
29376802216182,22sleep20-21swapper/207:05:582
293817399260,25cyclictest3089749-21apt-get11:25:124
293816899260,26cyclictest3045075-21cron10:10:002
293816699260,25cyclictest2959524-21cron07:44:591
2938182992523,1cyclictest0-21swapper/712:35:027
2938182992522,2cyclictest3056888-21perf10:30:007
293817799250,24cyclictest2947731-21awk07:24:595
293817199250,3cyclictest3042145-21turbostat10:05:003
2938168992524,1cyclictest2970075-21ntpq08:00:182
293816499250,25cyclictest2950690-21idleruntime-cro07:30:000
2938182992424,0cyclictest0-21swapper/707:10:137
2938182992422,1cyclictest3125125-21apt-get12:25:117
293818299240,3cyclictest3000882-21munin-run08:55:007
293818299240,23cyclictest3039631-21apt-get10:00:127
293817999240,24cyclictest0-21swapper/607:35:006
293817799240,23cyclictest0-21swapper/507:40:185
293817799240,23cyclictest0-21swapper/507:25:185
2938173992423,0cyclictest0-21swapper/410:10:174
293817399240,23cyclictest3068667-21perf10:50:004
293817399240,1cyclictest0-21swapper/409:25:114
2938171992424,0cyclictest0-21swapper/308:45:183
293817199240,24cyclictest2989064-21munin-run08:35:003
293817199240,23cyclictest2983139-21apt-get08:25:033
293817199240,23cyclictest0-21swapper/310:55:113
293816899240,23cyclictest366-21systemd-journal08:50:002
2938166992423,1cyclictest2939770-21ntpq07:10:181
2938166992423,1cyclictest0-21swapper/109:00:191
293816699240,23cyclictest0-21swapper/107:30:131
293816699240,1cyclictest3116281-21apt-get12:10:131
293816699240,1cyclictest0-21swapper/110:35:171
2938164992423,1cyclictest3018993-21apt-get09:25:100
293816499240,24cyclictest3030783-21apt-get09:45:120
293816499240,24cyclictest0-21swapper/011:25:110
2938182992322,1cyclictest3119218-21apt-get12:15:117
2938182992322,1cyclictest2946606-21ntpq07:20:207
2938182992322,1cyclictest0-21swapper/707:20:007
2938182992320,3cyclictest3065737-21awk10:45:007
293818299230,23cyclictest3115842-21cron12:09:597
293818299230,1cyclictest2950674-21munin-run07:30:007
2938179992322,1cyclictest3058622-21ntpq10:30:176
2938179992322,1cyclictest2938496-21apt-get07:10:136
2938179992322,1cyclictest0-21swapper/609:40:126
293817999230,22cyclictest0-21swapper/610:15:106
293817999230,22cyclictest0-21swapper/609:50:116
293817999230,1cyclictest2968802-21apt-get08:00:146
2938177992323,0cyclictest0-21swapper/507:30:145
2938177992322,1cyclictest0-21swapper/511:00:135
293817799230,22cyclictest3043846-21ntpq10:05:175
293817799230,22cyclictest0-21swapper/512:10:125
293817799230,22cyclictest0-21swapper/510:15:165
293817799230,22cyclictest0-21swapper/508:45:115
293817799230,22cyclictest0-21swapper/508:25:185
2938173992323,0cyclictest0-21swapper/410:15:114
2938173992321,1cyclictest0-21swapper/411:35:124
293817399230,22cyclictest0-21swapper/409:20:004
293817399230,22cyclictest0-21swapper/408:05:174
293817399230,22cyclictest0-21swapper/408:00:134
2938171992323,0cyclictest0-21swapper/312:05:123
2938171992322,1cyclictest0-21swapper/310:10:193
293817199230,23cyclictest3095210-21ls11:34:593
293817199230,22cyclictest0-21swapper/312:10:133
293817199230,22cyclictest0-21swapper/311:00:133
293817199230,22cyclictest0-21swapper/310:35:113
293817199230,22cyclictest0-21swapper/308:05:113
2938168992322,1cyclictest0-21swapper/207:20:172
2938168992321,1cyclictest0-21swapper/208:30:012
293816899230,22cyclictest0-21swapper/211:45:102
293816899230,22cyclictest0-21swapper/211:20:122
293816899230,1cyclictest0-21swapper/207:30:182
2938166992321,1cyclictest2942251-21apt-get07:15:131
293816699230,22cyclictest0-21swapper/110:10:171
293816699230,22cyclictest0-21swapper/107:25:121
2938164992323,0cyclictest0-21swapper/007:35:120
293816499230,22cyclictest0-21swapper/011:45:110
293816499230,22cyclictest0-21swapper/010:00:120
2938182992222,0cyclictest0-21swapper/711:40:127
2938182992221,1cyclictest3107431-21apt-get11:55:117
2938182992221,1cyclictest3098173-21systemctl11:40:007
2938182992221,1cyclictest0-21swapper/708:45:027
2938182992220,1cyclictest3104485-21apt-get11:50:107
2938182992220,1cyclictest0-21swapper/708:05:117
293818299220,21cyclictest3130821-21latency_hist12:35:007
293818299220,21cyclictest3069124-21apt-get10:50:107
293818299220,21cyclictest0-21swapper/711:15:117
293818299220,21cyclictest0-21swapper/708:35:117
2938179992222,0cyclictest0-21swapper/611:25:116
2938179992222,0cyclictest0-21swapper/611:15:116
2938179992222,0cyclictest0-21swapper/611:00:146
2938179992222,0cyclictest0-21swapper/609:45:136
2938179992221,1cyclictest0-21swapper/612:00:106
2938179992221,1cyclictest0-21swapper/609:25:106
2938179992221,1cyclictest0-21swapper/609:10:126
293817999220,22cyclictest3130579-21apt-get12:35:036
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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