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2026-04-21 - 00:02

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 Mon Apr 20, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81910,0rcu_preempt3-21ksoftirqd/007:43:530
81830,0rcu_preempt3-21ksoftirqd/007:26:060
81750,0rcu_preempt3-21ksoftirqd/009:15:200
81740,0rcu_preempt3-21ksoftirqd/009:46:110
81740,0rcu_preempt19-21ksoftirqd/111:09:071
81710,0rcu_preempt3-21ksoftirqd/010:11:480
81680,0rcu_preempt3-21ksoftirqd/012:16:290
81680,0rcu_preempt3-21ksoftirqd/012:16:290
81680,0rcu_preempt3-21ksoftirqd/011:38:440
81670,0rcu_preempt851-21rngd07:36:490
10050670,0irq/346-484840054-21kswapd010:03:410
10050670,0irq/346-484840054-21kswapd010:03:410
81660,0rcu_preempt3-21ksoftirqd/010:38:530
81660,0rcu_preempt3-21ksoftirqd/010:38:530
81660,0rcu_preempt3-21ksoftirqd/010:31:090
81650,0rcu_preempt3-21ksoftirqd/009:38:540
81650,0rcu_preempt3-21ksoftirqd/008:13:460
81650,0rcu_preempt12600-21apt-get08:48:370
81640,0rcu_preempt3-21ksoftirqd/009:48:510
12040996424,0cyclictest27217-21ssh12:32:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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