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2026-05-10 - 17:05

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 Sun May 10, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811640,0rcu_preempt19-21ksoftirqd/107:38:311
811620,0rcu_preempt12955-1kworker/1:1H07:23:061
811620,0rcu_preempt12955-1kworker/1:1H07:23:061
811360,0rcu_preempt19-21ksoftirqd/107:35:531
811350,0rcu_preempt3-21ksoftirqd/009:28:060
811340,0rcu_preempt3-21ksoftirqd/012:03:300
811330,0rcu_preempt19-21ksoftirqd/107:43:281
811330,0rcu_preempt19-21ksoftirqd/107:43:281
811210,0rcu_preempt3-21ksoftirqd/012:28:340
811210,0rcu_preempt19-21ksoftirqd/110:13:341
811170,0rcu_preempt3-21ksoftirqd/008:43:320
811140,0rcu_preempt19-21ksoftirqd/111:13:261
811130,0rcu_preempt3-21ksoftirqd/011:21:590
811110,0rcu_preempt3-21ksoftirqd/011:13:330
811110,0rcu_preempt19-21ksoftirqd/109:23:291
811100,0rcu_preempt3-21ksoftirqd/009:18:350
811100,0rcu_preempt3-21ksoftirqd/009:18:350
811100,0rcu_preempt3-21ksoftirqd/009:13:260
811100,0rcu_preempt19-21ksoftirqd/110:48:201
811100,0rcu_preempt19-21ksoftirqd/110:43:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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