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2026-04-15 - 22:30

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 Apr 15, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
9361192255180,25sleep70-21swapper/707:09:317
9358752224170,18sleep00-21swapper/007:06:030
9359072220183,24sleep30-21swapper/307:06:303
9358922220182,25sleep60-21swapper/607:06:176
9360872219186,21sleep50-21swapper/507:09:065
9360742219185,21sleep10-21swapper/107:08:531
9360322213179,22sleep40-21swapper/407:08:174
9361142209174,23sleep20-21swapper/207:09:262
93638599300,13cyclictest0-21swapper/711:15:197
93638599297,4cyclictest0-21swapper/708:41:347
93636899290,28cyclictest1057851-21idleruntime-cro10:40:002
93636899290,28cyclictest0-21swapper/209:35:002
93638599287,4cyclictest0-21swapper/707:35:397
93638599286,4cyclictest0-21swapper/711:48:167
93638599286,4cyclictest0-21swapper/707:46:397
93637899260,25cyclictest968701-21apt08:05:005
93636899260,25cyclictest1-21systemd12:20:002
93636899260,25cyclictest0-21swapper/212:05:112
93636899260,25cyclictest0-21swapper/210:30:012
93636899260,25cyclictest0-21swapper/208:25:122
93638599257,18cyclictest0-21swapper/711:37:177
93638599257,0cyclictest0-21swapper/710:31:247
93638599256,18cyclictest0-21swapper/711:59:167
93636999250,24cyclictest0-21swapper/308:35:113
936368992520,4cyclictest1080675-21munin-run11:20:002
93636899250,24cyclictest0-21swapper/212:25:122
93636899250,24cyclictest0-21swapper/208:55:132
93636899250,24cyclictest0-21swapper/208:45:112
93636899250,24cyclictest0-21swapper/207:50:112
93636199250,24cyclictest1080680-21basename11:20:000
93638599247,0cyclictest0-21swapper/708:30:347
93638599247,0cyclictest0-21swapper/707:57:377
93638599246,18cyclictest0-21swapper/710:42:227
93638599246,0cyclictest0-21swapper/709:14:307
93638399240,23cyclictest1003419-21apt-get09:05:136
93636899240,3cyclictest0-21swapper/207:20:112
93636899240,23cyclictest997268-21dump-pmu-power08:55:002
93636899240,23cyclictest0-21swapper/211:20:102
93636499240,23cyclictest0-21swapper/112:09:591
93636499240,23cyclictest0-21swapper/109:20:111
936361992422,1cyclictest963408-21apt-get07:55:130
93638599236,0cyclictest0-21swapper/709:25:297
93638599236,0cyclictest0-21swapper/707:24:417
93638599235,18cyclictest0-21swapper/710:20:247
93638599235,0cyclictest0-21swapper/709:58:267
93638599230,22cyclictest659127-21cups-browsed09:40:007
93638599230,22cyclictest659127-21cups-browsed09:40:007
936383992323,0cyclictest0-21swapper/607:45:136
936383992322,1cyclictest1046386-21munin-run10:20:016
93638399230,23cyclictest0-21swapper/612:19:596
93638399230,1cyclictest1092544-21apt-get11:40:136
936373992323,0cyclictest0-21swapper/409:10:124
936369992322,1cyclictest0-21swapper/309:50:123
93636999230,22cyclictest977279-21perf08:20:003
93636999230,22cyclictest1101096-21apt-get11:55:113
93636999230,22cyclictest1020827-21apt-get09:35:123
93636999230,22cyclictest1020827-21apt-get09:35:113
93636999230,22cyclictest0-21swapper/311:35:113
93636999230,22cyclictest0-21swapper/309:10:123
93636999230,22cyclictest0-21swapper/307:45:013
936368992321,1cyclictest0-21swapper/209:05:122
93636899230,2cyclictest0-21swapper/210:30:132
93636899230,22cyclictest1043268-21awk10:15:002
93636899230,22cyclictest0-21swapper/211:35:112
936364992321,1cyclictest1066369-21cron10:55:001
936364992320,2cyclictest1054978-21idleruntime-cro10:35:011
93636499230,22cyclictest1089255-21basename11:35:011
93636499230,22cyclictest0-21swapper/109:10:111
93636499230,1cyclictest0-21swapper/109:20:001
936361992321,1cyclictest0-21swapper/009:35:110
936361992321,1cyclictest0-21swapper/009:35:110
936361992320,2cyclictest1052086-21cron10:30:000
93636199230,22cyclictest0-21swapper/009:40:180
936385992221,0cyclictest0-21swapper/711:50:117
93638599220,2cyclictest1005842-21apt09:10:007
93638599220,21cyclictest1011994-21apt-get09:20:117
936383992220,1cyclictest0-21swapper/609:50:136
93638399220,2cyclictest1043274-21awk10:15:016
93638399220,22cyclictest0-21swapper/611:20:006
93638399220,21cyclictest965827-21latency_hist08:00:006
93638399220,21cyclictest1052529-21apt-get10:30:126
93638399220,21cyclictest0-21swapper/611:35:126
93638399220,21cyclictest0-21swapper/610:40:136
93638399220,21cyclictest0-21swapper/608:20:126
93638399220,1cyclictest761rcuc/609:40:006
93638399220,1cyclictest761rcuc/609:40:006
936378992222,0cyclictest0-21swapper/510:50:115
936378992220,2cyclictest1035127-21apt-get10:00:105
936378992220,1cyclictest0-21swapper/512:25:125
936378992219,2cyclictest1034695-21awk10:00:005
93637899220,21cyclictest1029405-21apt-get09:50:125
93637899220,21cyclictest0-21swapper/512:00:125
93637899220,21cyclictest0-21swapper/511:40:135
93637899220,21cyclictest0-21swapper/508:15:125
93637899220,21cyclictest0-21swapper/508:10:115
93637899220,21cyclictest0-21swapper/508:05:125
93637899220,21cyclictest0-21swapper/507:45:135
93637899220,21cyclictest0-21swapper/507:10:125
93637899220,1cyclictest948424-21munin-run07:30:015
936373992222,0cyclictest0-21swapper/411:25:114
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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