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2026-07-21 - 14:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #5

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackaslot5s.osadl.org (updated Tue Jul 21, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811080,0rcu_preempt19-21ksoftirqd/122:47:091
81960,0rcu_preempt19-21ksoftirqd/122:07:501
10050960,0irq/346-484840041ktimersoftd/022:07:150
81890,0rcu_preempt13577-21ping19:57:221
81800,0rcu_preempt4370-21diskmemload23:23:581
81760,0rcu_preempt19-21ksoftirqd/123:57:241
81760,0rcu_preempt19-21ksoftirqd/123:07:111
81750,0rcu_preempt19-21ksoftirqd/121:42:151
81730,0rcu_preempt19-21ksoftirqd/100:07:091
10050720,0irq/346-484840011475-1kworker/0:0H22:22:010
81710,0rcu_preempt7160-21kworker/1:021:50:521
81710,0rcu_preempt27265-1kworker/1:1H00:18:421
81700,0rcu_preempt19-21ksoftirqd/123:19:581
81690,0rcu_preempt17567-21ssh21:19:491
81680,0rcu_preempt3-21ksoftirqd/022:27:090
81680,0rcu_preempt19-21ksoftirqd/122:06:571
81670,0rcu_preempt19-21ksoftirqd/121:32:201
81650,0rcu_preempt19-21ksoftirqd/100:23:051
81640,0rcu_preempt19-21ksoftirqd/122:42:221
81640,0rcu_preempt19-21ksoftirqd/122:27:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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