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2026-01-10 - 21:05

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Sat Jan 10, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811130,0rcu_preempt13495-21sh12:39:371
811130,0rcu_preempt0-21swapper/110:04:521
811100,0rcu_preempt19-21ksoftirqd/111:45:191
811090,0rcu_preempt19-21ksoftirqd/109:27:181
811080,0rcu_preempt27036-21ssh10:42:081
811080,0rcu_preempt19-21ksoftirqd/110:24:501
811070,0rcu_preempt485-21ssh11:53:401
811070,0rcu_preempt485-21ssh11:53:401
811060,0rcu_preempt19-21ksoftirqd/112:10:311
811060,0rcu_preempt19-21ksoftirqd/112:08:511
811060,0rcu_preempt19-21ksoftirqd/110:17:211
811060,0rcu_preempt0-21swapper/112:04:281
811060,0rcu_preempt0-21swapper/112:04:281
811060,0rcu_preempt0-21swapper/108:16:111
811050,0rcu_preempt26632-21apt-get12:20:091
811050,0rcu_preempt19-21ksoftirqd/110:12:361
811050,0rcu_preempt0-21swapper/110:29:531
811040,0rcu_preempt54-21kswapd011:40:291
811040,0rcu_preempt19-21ksoftirqd/111:35:031
811040,0rcu_preempt19-21ksoftirqd/110:55:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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