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2025-12-03 - 14:33

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 Dec 03, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1107921010,0sleep010050irq/346-484840020:30:300
81930,0rcu_preempt32556-21apt-get21:59:350
78042910,0sleep010050irq/346-484840020:20:230
81900,0rcu_preempt3-21ksoftirqd/021:19:450
81900,0rcu_preempt16032-21cyclictest21:12:450
81880,0rcu_preempt3-21ksoftirqd/023:59:260
81880,0rcu_preempt3-21ksoftirqd/022:19:380
81870,0rcu_preempt3-21ksoftirqd/022:04:350
81870,0rcu_preempt3-21ksoftirqd/019:59:570
81870,0rcu_preempt3-21ksoftirqd/000:34:370
81820,0rcu_preempt3-21ksoftirqd/022:19:250
81810,0rcu_preempt3-21ksoftirqd/022:09:260
81790,0rcu_preempt3-21ksoftirqd/023:34:370
81790,0rcu_preempt3-21ksoftirqd/000:19:360
81780,0rcu_preempt3-21ksoftirqd/023:44:050
81740,0rcu_preempt3-21ksoftirqd/023:04:550
81740,0rcu_preempt3-21ksoftirqd/021:43:540
81740,0rcu_preempt3-21ksoftirqd/021:39:230
81740,0rcu_preempt3-21ksoftirqd/021:19:240
81730,0rcu_preempt3-21ksoftirqd/023:24:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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