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2026-10-11 - 15:46

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 50 highest latencies:
System rackaslot5s.osadl.org (updated Sun Oct 11, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811250,0rcu_preempt19-21ksoftirqd/111:09:491
81940,0rcu_preempt3-21ksoftirqd/009:58:320
81930,0rcu_preempt3-21ksoftirqd/009:45:020
81870,0rcu_preempt3-21ksoftirqd/010:45:060
81830,0rcu_preempt3-21ksoftirqd/012:04:140
81760,0rcu_preempt3-21ksoftirqd/011:44:410
81730,0rcu_preempt8582-21ssh10:43:240
81710,0rcu_preempt3-21ksoftirqd/011:50:050
81710,0rcu_preempt3-21ksoftirqd/008:00:200
81700,0rcu_preempt3-21ksoftirqd/010:20:070
81700,0rcu_preempt18979-21apt-get07:50:010
81690,0rcu_preempt3395-21ssh11:10:180
81690,0rcu_preempt3-21ksoftirqd/007:55:110
10050690,0irq/346-48484009188-1kworker/0:2H11:16:200
81680,0rcu_preempt3-21ksoftirqd/012:30:130
81680,0rcu_preempt12689-21apt-get10:15:020
81670,0rcu_preempt3-21ksoftirqd/009:21:040
81630,0rcu_preempt3-21ksoftirqd/008:40:150
81610,0rcu_preempt3-21ksoftirqd/011:00:170
81610,0rcu_preempt3-21ksoftirqd/009:15:180
81610,0rcu_preempt1332-21apt-get08:35:030
10050610,0irq/346-48484000-21swapper/011:38:430
81600,0rcu_preempt3-21ksoftirqd/011:55:140
81600,0rcu_preempt3-21ksoftirqd/011:55:140
81600,0rcu_preempt3-21ksoftirqd/010:39:230
81600,0rcu_preempt3-21ksoftirqd/010:01:470
81600,0rcu_preempt3-21ksoftirqd/010:01:470
81600,0rcu_preempt3-21ksoftirqd/009:53:340
81600,0rcu_preempt19-21ksoftirqd/110:25:031
81590,0rcu_preempt3-21ksoftirqd/009:25:190
5721995919,0cyclictest9000-21ping07:25:010
81580,0rcu_preempt3-21ksoftirqd/012:35:100
81580,0rcu_preempt3-21ksoftirqd/008:20:020
10050580,0irq/346-48484000-21swapper/011:46:280
81570,0rcu_preempt9800-21ssh10:11:250
81570,0rcu_preempt3-21ksoftirqd/011:25:220
81570,0rcu_preempt3-21ksoftirqd/008:55:090
81570,0rcu_preempt24372-21apt-get12:05:010
5721995713,0cyclictest0-21swapper/010:54:510
81560,0rcu_preempt3-21ksoftirqd/009:40:180
81560,0rcu_preempt3-21ksoftirqd/009:05:010
81560,0rcu_preempt3-21ksoftirqd/007:05:040
81560,0rcu_preempt21820-21ping08:24:510
81560,0rcu_preempt19-21ksoftirqd/111:37:021
9950550,0irq/345-484840027448-1kworker/1:0H11:23:311
81550,0rcu_preempt3-21ksoftirqd/012:10:100
81550,0rcu_preempt3-21ksoftirqd/011:30:270
81550,0rcu_preempt3-21ksoftirqd/009:00:090
81550,0rcu_preempt3-21ksoftirqd/009:00:090
81550,0rcu_preempt3-21ksoftirqd/008:45:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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