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2026-09-08 - 19:45

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 Sep 08, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811270,0rcu_preempt16806-21kworker/1:109:45:131
811250,0rcu_preempt19-21ksoftirqd/109:58:421
811240,0rcu_preempt19-21ksoftirqd/110:11:291
811190,0rcu_preempt19-21ksoftirqd/112:17:581
811190,0rcu_preempt19-21ksoftirqd/112:06:041
811190,0rcu_preempt0-21swapper/112:28:311
811180,0rcu_preempt19-21ksoftirqd/111:53:541
811170,0rcu_preempt19-21ksoftirqd/110:06:001
811170,0rcu_preempt19-21ksoftirqd/109:41:201
811160,0rcu_preempt836-21rngd10:36:391
811160,0rcu_preempt19-21ksoftirqd/112:04:081
811160,0rcu_preempt19-21ksoftirqd/110:33:401
811120,0rcu_preempt19-21ksoftirqd/109:12:231
811110,0rcu_preempt19-21ksoftirqd/111:20:061
811090,0rcu_preempt9706-21apt-get11:24:321
811090,0rcu_preempt9706-21apt-get11:24:321
811080,0rcu_preempt19-21ksoftirqd/110:44:351
811080,0rcu_preempt19-21ksoftirqd/109:30:591
811060,0rcu_preempt19-21ksoftirqd/111:37:061
811060,0rcu_preempt19-21ksoftirqd/109:20:031
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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