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2026-08-16 - 08:53

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 Aug 16, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811290,0rcu_preempt3-21ksoftirqd/021:33:580
811290,0rcu_preempt3-21ksoftirqd/021:33:580
811290,0rcu_preempt3-21ksoftirqd/021:21:100
811250,0rcu_preempt3-21ksoftirqd/023:09:160
811210,0rcu_preempt3-21ksoftirqd/000:24:080
811200,0rcu_preempt3-21ksoftirqd/022:20:030
811180,0rcu_preempt3-21ksoftirqd/023:17:490
811170,0rcu_preempt3-21ksoftirqd/022:57:010
811170,0rcu_preempt3-21ksoftirqd/000:34:020
811160,0rcu_preempt3-21ksoftirqd/023:57:250
811150,0rcu_preempt3-21ksoftirqd/022:35:470
811140,0rcu_preempt3-21ksoftirqd/000:36:190
811130,0rcu_preempt3-21ksoftirqd/023:42:370
811110,0rcu_preempt3-21ksoftirqd/022:54:270
811100,0rcu_preempt3-21ksoftirqd/023:52:250
811100,0rcu_preempt3-21ksoftirqd/022:43:500
811100,0rcu_preempt3-21ksoftirqd/021:53:300
811100,0rcu_preempt3-21ksoftirqd/000:09:310
811080,0rcu_preempt3-21ksoftirqd/021:58:010
811070,0rcu_preempt3-21ksoftirqd/022:29:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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