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2025-12-06 - 15:01

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 Sat Dec 06, 2025 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81940,0rcu_preempt3996-1kworker/1:2H07:39:461
81920,0rcu_preempt24809-1kworker/1:0H09:36:281
81890,0rcu_preempt19-21ksoftirqd/110:19:481
172352880,0sleep010050irq/346-484840008:08:130
81870,0rcu_preempt19-21ksoftirqd/110:25:291
81860,0rcu_preempt19-21ksoftirqd/112:17:451
81850,0rcu_preempt19-21ksoftirqd/108:57:041
81830,0rcu_preempt54-21kswapd009:45:581
81830,0rcu_preempt54-21kswapd009:45:581
81830,0rcu_preempt19-21ksoftirqd/110:54:511
81820,0rcu_preempt19-21ksoftirqd/109:28:461
140362820,0sleep010050irq/346-484840007:59:110
140362820,0sleep010050irq/346-484840007:59:110
81810,0rcu_preempt19-21ksoftirqd/111:09:391
81810,0rcu_preempt19-21ksoftirqd/109:29:571
236792800,0sleep010050irq/346-484840008:27:040
236792800,0sleep010050irq/346-484840008:27:040
81770,0rcu_preempt3-21ksoftirqd/009:55:350
81750,0rcu_preempt3-21ksoftirqd/011:36:470
81730,0rcu_preempt3-21ksoftirqd/010:18:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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