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2025-12-14 - 15:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 50 highest latencies:
System rackcslot7s.osadl.org (updated Sun Dec 14, 2025 12:44:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
100823022080,9sleep10-21swapper/107:08:011
197399990,79rtkit-daemon0-21swapper/207:07:592
10999172920,5sleep0161rcuc/011:25:190
10685072810,3sleep30-21swapper/309:55:203
10482062800,5sleep20-21swapper/209:00:012
100853399764,15cyclictest141rcu_preempt07:27:580
100854299752,68cyclictest2069-21gnome-shell08:07:582
100854599742,52cyclictest2069-21gnome-shell09:43:593
100854299742,67cyclictest2069-21gnome-shell10:37:592
100854299742,67cyclictest2069-21gnome-shell09:52:592
10864312730,6sleep10-21swapper/110:45:281
11216352720,16chrt42-21ksoftirqd/312:25:303
100853399725,8cyclictest141rcu_preempt11:17:590
100764627243,21sleep30-21swapper/307:05:193
100853399706,36cyclictest2069-21gnome-shell08:44:580
10751862690,7chrt4497-21PK-Backend10:15:141
10686742690,4sleep10-21swapper/109:55:221
100854299692,62cyclictest2069-21gnome-shell09:49:592
100853399692,7cyclictest141rcu_preempt12:20:590
100854599682,46cyclictest2069-21gnome-shell07:17:583
100853399683,7cyclictest141rcu_preempt11:24:590
100853399683,7cyclictest141rcu_preempt08:57:580
10912152670,5sleep2331rcuc/211:00:182
100854299672,60cyclictest2069-21gnome-shell09:11:582
100854299671,61cyclictest2069-21gnome-shell08:15:582
100853399672,14cyclictest141rcu_preempt10:47:590
100853399671,42cyclictest4497-21PK-Backend12:13:590
100853399671,42cyclictest4497-21PK-Backend12:13:590
100854599662,5cyclictest0-21swapper/308:20:583
100854299662,61cyclictest0-21swapper/209:40:592
100854299662,60cyclictest2069-21gnome-shell10:28:592
100854299662,24cyclictest0-21swapper/209:56:592
100854299662,24cyclictest0-21swapper/209:08:582
100854599652,44cyclictest141rcu_preempt11:09:593
100854599652,42cyclictest0-21swapper/309:03:583
100854299652,59cyclictest0-21swapper/210:00:592
100854299652,59cyclictest0-21swapper/210:00:592
100854299652,59cyclictest0-21swapper/209:01:582
100854599642,59cyclictest0-21swapper/309:51:593
100854299642,59cyclictest0-21swapper/208:13:582
1008545996338,21cyclictest2069-21gnome-shell10:39:593
100854299632,58cyclictest0-21swapper/210:40:592
100738926342,13sleep00-21swapper/007:05:160
1008545996238,20cyclictest2069-21gnome-shell08:04:583
1008545996238,20cyclictest2069-21gnome-shell08:04:583
100854299622,57cyclictest0-21swapper/207:16:582
100853399622,53cyclictest2069-21gnome-shell07:40:580
11207992610,13sleep234-21ksoftirqd/212:25:132
100854599612,42cyclictest0-21swapper/311:27:593
1008545996036,20cyclictest2069-21gnome-shell09:09:583
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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