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2025-12-08 - 09:45

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 Mon Dec 08, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81930,0rcu_preempt21219-1kworker/0:2H22:21:500
81850,0rcu_preempt23155-1kworker/0:2H19:34:470
81850,0rcu_preempt23155-1kworker/0:2H19:34:470
125322760,0sleep010050irq/346-484840020:24:450
99932730,0sleep09950irq/345-484840023:25:380
68802650,0sleep010050irq/346-484840020:08:340
81630,0rcu_preempt3-21ksoftirqd/000:04:480
81610,0rcu_preempt19-21ksoftirqd/123:39:531
90822590,0sleep09950irq/345-484840020:14:430
81590,0rcu_preempt19-21ksoftirqd/122:34:091
10050590,0irq/346-484840054-21kswapd022:39:310
81560,0rcu_preempt19-21ksoftirqd/121:34:251
84682550,0sleep010050irq/346-484840020:13:050
81550,0rcu_preempt19-21ksoftirqd/122:34:411
10050540,0irq/346-484840028589-1kworker/0:3H21:21:410
10050540,0irq/346-484840021963-1kworker/0:2H23:02:250
9950530,0irq/345-484840025366-1kworker/0:0H22:26:170
81530,0rcu_preempt19-21ksoftirqd/122:54:511
81530,0rcu_preempt19-21ksoftirqd/121:15:511
80222530,0sleep09950irq/345-484840021:24:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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