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2026-07-28 - 21:14

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 Fri Jul 24, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811220,0rcu_preempt19-21ksoftirqd/109:21:001
811150,0rcu_preempt3-21ksoftirqd/011:45:200
811120,0rcu_preempt3-21ksoftirqd/011:27:190
81930,0rcu_preempt54-21kswapd009:23:561
81930,0rcu_preempt19-21ksoftirqd/111:22:161
81920,0rcu_preempt54-21kswapd011:35:031
81920,0rcu_preempt54-21kswapd011:35:031
81910,0rcu_preempt19-21ksoftirqd/109:07:101
81910,0rcu_preempt0-21swapper/110:48:161
81900,0rcu_preempt14946-21kworker/u4:009:51:590
81890,0rcu_preempt19-21ksoftirqd/112:15:231
81870,0rcu_preempt3-21ksoftirqd/010:22:060
81840,0rcu_preempt19-21ksoftirqd/112:19:211
81840,0rcu_preempt19-21ksoftirqd/111:43:501
81820,0rcu_preempt19-21ksoftirqd/109:27:041
81810,0rcu_preempt19-21ksoftirqd/110:26:401
81790,0rcu_preempt19-21ksoftirqd/110:09:471
81790,0rcu_preempt0-21swapper/110:03:291
81780,0rcu_preempt851-21rngd12:11:101
81780,0rcu_preempt54-21kswapd009:14:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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