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2026-04-28 - 00:32

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 27, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811260,0rcu_preempt3-21ksoftirqd/011:50:070
811110,0rcu_preempt3-21ksoftirqd/012:02:310
811050,0rcu_preempt19-21ksoftirqd/112:28:191
811010,0rcu_preempt19-21ksoftirqd/111:28:361
81970,0rcu_preempt19-21ksoftirqd/110:13:121
81880,0rcu_preempt19-21ksoftirqd/110:48:271
81860,0rcu_preempt19-21ksoftirqd/111:20:471
81860,0rcu_preempt0-21swapper/109:59:281
81840,0rcu_preempt54-21kswapd012:10:281
81830,0rcu_preempt4968-21ping08:20:041
81830,0rcu_preempt0-21swapper/111:52:391
81820,0rcu_preempt0-21swapper/111:45:421
81810,0rcu_preempt4968-21ping08:13:391
81810,0rcu_preempt19-21ksoftirqd/111:39:531
81810,0rcu_preempt19-21ksoftirqd/109:29:141
81790,0rcu_preempt54-21kswapd011:54:061
81770,0rcu_preempt0-21swapper/112:00:391
81770,0rcu_preempt0-21swapper/109:43:571
81760,0rcu_preempt28253-21diskmemload09:38:331
81750,0rcu_preempt0-21swapper/110:37:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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