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2025-11-14 - 20:03

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 Nov 14, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81880,0rcu_preempt19-21ksoftirqd/109:55:121
81880,0rcu_preempt19-21ksoftirqd/109:55:121
81810,0rcu_preempt12267-21kworker/0:209:13:450
81800,0rcu_preempt4575-21kworker/0:011:31:410
81770,0rcu_preempt3-21ksoftirqd/012:37:090
81770,0rcu_preempt3-21ksoftirqd/012:16:040
81750,0rcu_preempt29735-21kworker/0:111:49:530
81740,0rcu_preempt54-21kswapd009:33:190
81730,0rcu_preempt3-21ksoftirqd/007:59:240
81730,0rcu_preempt29859-21kworker/0:009:40:020
81720,0rcu_preempt4575-21kworker/0:011:24:090
81720,0rcu_preempt3-21ksoftirqd/008:10:140
81720,0rcu_preempt22525-21kworker/0:210:19:230
81710,0rcu_preempt54-21kswapd011:11:480
81710,0rcu_preempt5245-21kworker/0:212:12:380
81710,0rcu_preempt3-21ksoftirqd/010:35:460
81710,0rcu_preempt22525-21kworker/0:210:20:120
81710,0rcu_preempt17783-21kworker/0:111:36:160
81710,0rcu_preempt17520-21kworker/0:207:45:110
81700,0rcu_preempt3-21ksoftirqd/008:20:360
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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