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2026-08-18 - 17:55

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 Aug 18, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81940,0rcu_preempt19-21ksoftirqd/110:25:241
81900,0rcu_preempt0-21swapper/109:09:521
81870,0rcu_preempt19-21ksoftirqd/112:20:061
81830,0rcu_preempt1591-21kworker/0:110:48:420
81800,0rcu_preempt19-21ksoftirqd/111:16:311
81780,0rcu_preempt3-21ksoftirqd/011:28:070
81770,0rcu_preempt3-21ksoftirqd/012:16:110
81760,0rcu_preempt3-21ksoftirqd/010:17:340
81740,0rcu_preempt3-21ksoftirqd/009:55:350
81740,0rcu_preempt3-21ksoftirqd/009:55:350
81730,0rcu_preempt3-21ksoftirqd/009:16:350
81720,0rcu_preempt3-21ksoftirqd/011:40:520
81720,0rcu_preempt3-21ksoftirqd/009:14:230
81720,0rcu_preempt10550-21ssh10:22:460
81710,0rcu_preempt3-21ksoftirqd/011:58:510
81710,0rcu_preempt19-21ksoftirqd/112:06:221
81700,0rcu_preempt3-21ksoftirqd/011:05:410
81690,0rcu_preempt3-21ksoftirqd/009:39:300
81690,0rcu_preempt3-21ksoftirqd/009:31:120
81690,0rcu_preempt19-21ksoftirqd/110:20:081
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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