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2026-03-12 - 12:24

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 rack7slot4s.osadl.org (updated Thu Mar 12, 2026 00:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
415199542,25cyclictest8908-21ssh22:50:132
415199521,31cyclictest20011-21ssh23:50:122
4159995115,28cyclictest28366irq/58-eth000:15:143
415199452,28cyclictest6947-21sh21:55:142
415999426,22cyclictest28366irq/58-eth022:45:133
415199424,23cyclictest23377-21ssh22:40:142
415199422,24cyclictest1545-21ssh22:10:122
4128994226,3cyclictest12-21ksoftirqd/022:30:120
415999413,23cyclictest28366irq/58-eth000:35:133
415199415,28cyclictest0-21swapper/220:35:132
415199415,28cyclictest0-21swapper/220:35:122
412899411,3cyclictest131rcu_preempt19:25:120
4159993629,4cyclictest28366irq/58-eth021:35:113
4159993629,4cyclictest28366irq/58-eth021:35:103
415999352,22cyclictest28366irq/58-eth023:10:113
415199352,26cyclictest0-21swapper/200:25:162
415999342,20cyclictest28366irq/58-eth022:50:123
415999341,18cyclictest28366irq/58-eth020:05:123
415999333,18cyclictest28366irq/58-eth021:45:133
415199337,13cyclictest0-21swapper/200:10:422
4159993216,11cyclictest28366irq/58-eth023:35:143
415199326,15cyclictest0-21swapper/223:01:042
415199325,15cyclictest22346irq/40-dwc2_hso20:00:132
415199323,18cyclictest30323-21ssh21:50:142
4151993217,10cyclictest1875-21apt-get20:15:162
4151993215,13cyclictest5713-21apt-get00:00:112
414399323,26cyclictest10995-21ssh23:45:141
415999313,13cyclictest28366irq/58-eth021:50:143
4159993118,9cyclictest28366irq/58-eth000:25:163
415199316,18cyclictest0-21swapper/222:45:122
415999304,16cyclictest28366irq/58-eth022:00:133
415199309,13cyclictest0-21swapper/222:17:012
415199308,16cyclictest0-21swapper/221:10:112
415199308,10cyclictest0-21swapper/219:20:102
415199306,12cyclictest0-21swapper/223:15:092
4151993016,9cyclictest5321-21apt-get22:30:122
415999293,16cyclictest28366irq/58-eth023:00:113
415999292,18cyclictest28366irq/58-eth023:20:113
415999291,17cyclictest28366irq/58-eth000:00:123
415199297,17cyclictest0-21swapper/219:55:112
415199293,16cyclictest15947-21ssh22:00:122
415199293,15cyclictest22346irq/40-dwc2_hso20:50:132
415199292,21cyclictest0-21swapper/220:20:132
4151992921,5cyclictest19523-21ssh23:30:232
4151992921,5cyclictest19523-21ssh23:30:232
414399291,15cyclictest0-21swapper/119:35:101
415999285,14cyclictest28366irq/58-eth022:05:123
415999281,16cyclictest28366irq/58-eth022:15:123
415199288,15cyclictest0-21swapper/200:30:112
415199288,13cyclictest0-21swapper/222:28:252
415199288,13cyclictest0-21swapper/222:07:152
415199287,4cyclictest0-21swapper/221:32:142
415199287,12cyclictest0-21swapper/223:14:312
415199286,14cyclictest0-21swapper/221:28:192
415199286,14cyclictest0-21swapper/221:28:182
415199283,15cyclictest22346irq/40-dwc2_hso21:05:132
415199282,18cyclictest22346irq/40-dwc2_hso21:20:122
415199281,20cyclictest0-21swapper/220:40:122
412899282,20cyclictest11795-21ssh00:38:530
415999272,16cyclictest28366irq/58-eth023:40:123
415999271,15cyclictest28366irq/58-eth000:30:123
415199275,13cyclictest0-21swapper/200:18:542
415199272,19cyclictest0-21swapper/219:50:132
415199272,16cyclictest22346irq/40-dwc2_hso00:05:112
415199271,21cyclictest0-21swapper/223:25:132
415199267,7cyclictest0-21swapper/221:43:142
4151992611,12cyclictest18195-21cron00:25:012
415199260,17cyclictest2957-21ssh21:35:112
415199260,17cyclictest2957-21ssh21:35:102
415199256,3cyclictest0-21swapper/221:16:582
415199255,12cyclictest22346irq/40-dwc2_hso20:30:102
415199253,13cyclictest22346irq/40-dwc2_hso20:05:132
4151992518,4cyclictest28286-21apt-get19:35:102
415199250,8cyclictest25386-21/usr/sbin/munin23:35:172
414399252,18cyclictest11739-21sh00:38:491
4143992511,5cyclictest21-21ksoftirqd/119:50:131
412899254,15cyclictest5725-21ssh00:00:110
412899252,19cyclictest19730-21ssh22:20:150
412899252,17cyclictest14352-21ssh22:35:130
415999248,9cyclictest28366irq/58-eth022:10:133
415199247,4cyclictest0-21swapper/222:21:262
415199243,7cyclictest8758-21usage_EthcTask00:35:322
415199241,13cyclictest3573-21ssh23:05:102
414399242,14cyclictest5322-21ssh22:30:111
414399240,11cyclictest3744-21ssh22:10:201
415999236,10cyclictest28366irq/58-eth023:45:153
415999232,7cyclictest28366irq/58-eth020:00:133
415999232,12cyclictest28366irq/58-eth023:55:123
415199237,4cyclictest0-21swapper/223:56:592
415199237,4cyclictest0-21swapper/223:46:122
415199236,4cyclictest0-21swapper/223:20:432
4151992310,10cyclictest0-21swapper/219:45:192
4151992310,10cyclictest0-21swapper/219:45:192
414399238,10cyclictest21-21ksoftirqd/123:50:121
414399235,14cyclictest171-21systemd-network23:40:131
414399231,17cyclictest1357-21ls22:10:021
414399231,16cyclictest27563-21ssh00:30:131
412899231,18cyclictest20200-21cut23:50:160
415999223,14cyclictest28366irq/58-eth023:05:133
415999221,4cyclictest0-21swapper/323:25:123
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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