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2026-07-07 - 12:12

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 Jul 07, 2026 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811420,0rcu_preempt19-21ksoftirqd/119:22:461
811110,0rcu_preempt19-21ksoftirqd/119:17:441
811080,0rcu_preempt3-21ksoftirqd/000:14:470
811030,0rcu_preempt3-21ksoftirqd/021:31:070
811010,0rcu_preempt19-21ksoftirqd/123:07:221
811010,0rcu_preempt19-21ksoftirqd/123:02:311
81990,0rcu_preempt19-21ksoftirqd/123:52:241
81960,0rcu_preempt19-21ksoftirqd/123:17:291
81960,0rcu_preempt19-21ksoftirqd/122:57:361
81950,0rcu_preempt19-21ksoftirqd/122:20:181
81950,0rcu_preempt19-21ksoftirqd/121:51:521
81940,0rcu_preempt19-21ksoftirqd/120:17:321
81930,0rcu_preempt19-21ksoftirqd/122:32:241
81920,0rcu_preempt19-21ksoftirqd/123:57:321
81890,0rcu_preempt19-21ksoftirqd/123:37:331
81890,0rcu_preempt19-21ksoftirqd/121:37:281
81880,0rcu_preempt19-21ksoftirqd/123:32:351
81880,0rcu_preempt19-21ksoftirqd/100:27:281
81870,0rcu_preempt19-21ksoftirqd/100:06:451
81860,0rcu_preempt19-21ksoftirqd/121:42:391
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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