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2026-07-14 - 12:23

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 14, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811580,0rcu_preempt3-21ksoftirqd/023:09:210
811570,0rcu_preempt3-21ksoftirqd/021:22:580
811340,0rcu_preempt3-21ksoftirqd/023:48:220
81850,0rcu_preempt3-21ksoftirqd/022:50:370
81850,0rcu_preempt3-21ksoftirqd/022:42:130
81830,0rcu_preempt3-21ksoftirqd/023:57:050
81830,0rcu_preempt3-21ksoftirqd/000:32:150
81830,0rcu_preempt3-21ksoftirqd/000:32:150
81820,0rcu_preempt54-21kswapd000:27:140
81810,0rcu_preempt3-21ksoftirqd/021:42:270
81810,0rcu_preempt3-21ksoftirqd/020:47:280
81800,0rcu_preempt3-21ksoftirqd/021:33:010
81800,0rcu_preempt3-21ksoftirqd/021:17:290
10050790,0irq/346-484840054-21kswapd022:15:570
81780,0rcu_preempt3-21ksoftirqd/021:37:200
81780,0rcu_preempt3-21ksoftirqd/021:37:200
10050760,0irq/346-484840016875-1kworker/0:2H21:55:080
81750,0rcu_preempt3-21ksoftirqd/022:52:240
81750,0rcu_preempt3-21ksoftirqd/021:14:240
10050750,0irq/346-484840054-21kswapd023:45:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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