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2026-03-24 - 14:52

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 Mar 24, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10050860,0irq/346-4848400111rcuc/010:15:560
10050820,0irq/346-4848400111rcuc/011:32:480
10050820,0irq/346-4848400111rcuc/010:44:100
10050810,0irq/346-4848400111rcuc/012:31:560
10050790,0irq/346-484840041ktimersoftd/009:38:270
10050790,0irq/346-4848400111rcuc/011:59:050
10050780,0irq/346-4848400111rcuc/011:07:350
10050780,0irq/346-4848400111rcuc/011:07:350
81760,0rcu_preempt3-21ksoftirqd/010:11:570
1518899767,0cyclictest0-21swapper/010:36:520
10050760,0irq/346-4848400111rcuc/009:53:170
81730,0rcu_preempt3-21ksoftirqd/009:48:310
1518899736,0cyclictest13412-1kworker/0:3H12:21:430
81720,0rcu_preempt3-21ksoftirqd/009:20:560
81680,0rcu_preempt19-21ksoftirqd/110:15:311
81670,0rcu_preempt3-21ksoftirqd/012:24:040
81660,0rcu_preempt3-21ksoftirqd/007:14:160
81660,0rcu_preempt19-21ksoftirqd/112:09:091
1518899655,0cyclictest0-21swapper/012:12:450
10050650,0irq/346-484840054-21kswapd009:16:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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