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2025-12-20 - 07:38

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 20, 2025 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811380,0rcu_preempt19-21ksoftirqd/122:16:081
811340,0rcu_preempt19-21ksoftirqd/123:29:281
811320,0rcu_preempt11045-21ssh22:23:221
811300,0rcu_preempt19-21ksoftirqd/122:59:091
811280,0rcu_preempt19-21ksoftirqd/123:07:071
811260,0rcu_preempt19-21ksoftirqd/100:05:141
811260,0rcu_preempt19-21ksoftirqd/100:05:141
811250,0rcu_preempt19-21ksoftirqd/121:54:221
811240,0rcu_preempt19-21ksoftirqd/122:45:271
811210,0rcu_preempt757-21rngd22:39:151
811200,0rcu_preempt19-21ksoftirqd/121:16:501
811200,0rcu_preempt19-21ksoftirqd/121:16:501
811200,0rcu_preempt19-21ksoftirqd/120:05:251
811190,0rcu_preempt19-21ksoftirqd/122:14:081
811170,0rcu_preempt19-21ksoftirqd/119:45:321
811150,0rcu_preempt0-21swapper/121:46:211
811140,0rcu_preempt19-21ksoftirqd/123:42:521
811130,0rcu_preempt19-21ksoftirqd/122:43:041
811100,0rcu_preempt27977-21kworker/1:123:50:561
811100,0rcu_preempt19-21ksoftirqd/100:25:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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