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2026-06-02 - 05:00

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 Jun 02, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811400,0rcu_preempt19-21ksoftirqd/122:33:531
811300,0rcu_preempt0-21swapper/100:08:451
811280,0rcu_preempt19-21ksoftirqd/123:39:111
811000,0rcu_preempt851-21rngd22:26:281
81950,0rcu_preempt19-21ksoftirqd/122:28:061
81940,0rcu_preempt29254-21kworker/1:022:21:511
81850,0rcu_preempt54-21kswapd023:27:001
10050740,0irq/346-484840030718-1kworker/0:0H21:19:150
81730,0rcu_preempt54-21kswapd000:00:571
81720,0rcu_preempt19-21ksoftirqd/123:49:061
10050720,0irq/346-484840017440-1kworker/0:0H22:07:460
81710,0rcu_preempt20793-21dropbear21:37:581
81700,0rcu_preempt19-21ksoftirqd/121:13:001
81700,0rcu_preempt19-21ksoftirqd/100:19:061
10050690,0irq/346-484840028311-1kworker/0:3H21:49:460
10050690,0irq/346-48484002681-1kworker/0:2H22:25:130
81680,0rcu_preempt19-21ksoftirqd/122:45:181
81670,0rcu_preempt3-21ksoftirqd/020:53:030
81670,0rcu_preempt20094-1kworker/1:1H22:11:361
81670,0rcu_preempt19-21ksoftirqd/123:33:341
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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