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2026-03-11 - 04:07

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 Wed Mar 11, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811240,0rcu_preempt19-21ksoftirqd/122:54:301
811200,0rcu_preempt851-21rngd21:19:331
811110,0rcu_preempt19-21ksoftirqd/120:04:331
811050,0rcu_preempt8315-21ssh21:52:331
811020,0rcu_preempt21794-21ssh23:44:301
811020,0rcu_preempt19-21ksoftirqd/123:37:311
811020,0rcu_preempt19-21ksoftirqd/100:35:321
81990,0rcu_preempt54-21kswapd023:22:381
81930,0rcu_preempt19-21ksoftirqd/122:08:311
81920,0rcu_preempt54-21kswapd023:58:251
81920,0rcu_preempt19-21ksoftirqd/121:11:521
81890,0rcu_preempt19-21ksoftirqd/100:24:321
81880,0rcu_preempt54-21kswapd021:30:371
81880,0rcu_preempt54-21kswapd021:26:381
81860,0rcu_preempt19-21ksoftirqd/122:47:141
81830,0rcu_preempt19-21ksoftirqd/123:59:571
81830,0rcu_preempt19-21ksoftirqd/122:14:371
81830,0rcu_preempt0-21swapper/122:42:191
81820,0rcu_preempt19-21ksoftirqd/119:23:501
81810,0rcu_preempt740-21kworker/1:123:04:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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