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2026-04-09 - 19:09

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Thu Apr 09, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81910,0rcu_preempt3-21ksoftirqd/007:49:020
81890,0rcu_preempt3-21ksoftirqd/007:39:010
81840,0rcu_preempt3-21ksoftirqd/010:57:550
10050800,0irq/346-484840019762-1kworker/0:1H09:49:110
10050780,0irq/346-4848400851-21rngd10:09:350
10050760,0irq/346-48484006260-1kworker/0:4H11:38:260
10050760,0irq/346-484840030543-1kworker/0:2H11:54:150
10050730,0irq/346-484840054-21kswapd010:29:010
81720,0rcu_preempt26336-21kworker/0:210:26:200
81710,0rcu_preempt3-21ksoftirqd/011:39:010
81710,0rcu_preempt3-21ksoftirqd/011:25:590
81710,0rcu_preempt3-21ksoftirqd/011:21:020
81710,0rcu_preempt3-21ksoftirqd/010:18:520
81710,0rcu_preempt20993-21kworker/0:208:54:000
81700,0rcu_preempt3-21ksoftirqd/009:38:530
81680,0rcu_preempt3-21ksoftirqd/010:18:050
81680,0rcu_preempt3-21ksoftirqd/010:18:050
81680,0rcu_preempt0-21swapper/009:16:450
81670,0rcu_preempt3-21ksoftirqd/010:38:590
81650,0rcu_preempt3-21ksoftirqd/011:48:470
81650,0rcu_preempt3-21ksoftirqd/011:48:470
81650,0rcu_preempt3-21ksoftirqd/011:04:010
81650,0rcu_preempt3-21ksoftirqd/011:04:010
81650,0rcu_preempt3-21ksoftirqd/008:58:530
81630,0rcu_preempt27205-21kworker/0:010:04:370
81630,0rcu_preempt16933-21kworker/dying10:01:060
10050630,0irq/346-4848400851-21rngd11:10:170
81620,0rcu_preempt3-21ksoftirqd/010:48:510
81620,0rcu_preempt3-21ksoftirqd/009:23:540
81620,0rcu_preempt18651-21kworker/0:109:20:090
81620,0rcu_preempt0-21swapper/011:13:560
81610,0rcu_preempt14927-21kworker/0:212:28:200
81610,0rcu_preempt0-21swapper/011:02:020
81600,0rcu_preempt3-21ksoftirqd/009:28:460
81600,0rcu_preempt3-21ksoftirqd/008:13:520
81600,0rcu_preempt27158-21ssh12:19:450
81600,0rcu_preempt0-21swapper/012:13:100
81600,0rcu_preempt0-21swapper/008:09:050
81580,0rcu_preempt851-21rngd12:32:010
81580,0rcu_preempt11871-21kworker/0:107:59:170
81580,0rcu_preempt0-21swapper/011:46:530
81580,0rcu_preempt0-21swapper/009:54:350
81580,0rcu_preempt0-21swapper/009:35:330
81580,0rcu_preempt0-21swapper/009:11:270
81570,0rcu_preempt3-21ksoftirqd/008:36:220
9950560,0irq/345-4848400380-1kworker/1:2H10:47:581
81560,0rcu_preempt3-21ksoftirqd/010:34:000
81560,0rcu_preempt21454-21users08:24:070
81560,0rcu_preempt11842-21ping08:18:460
81560,0rcu_preempt11842-21ping08:18:460
81560,0rcu_preempt10540-21apt-get07:53:460
81560,0rcu_preempt0-21swapper/012:04:530
9950550,0irq/345-484840032175-1kworker/1:2H12:29:561
9950550,0irq/345-484840024631-1kworker/1:0H09:42:461
81550,0rcu_preempt3-21ksoftirqd/008:38:540
81550,0rcu_preempt3-21ksoftirqd/008:38:540
81550,0rcu_preempt3-21ksoftirqd/008:28:550
81550,0rcu_preempt0-21swapper/010:44:580
9950540,0irq/345-484840016531-1kworker/1:0H10:04:371
81540,0rcu_preempt3-21ksoftirqd/009:43:520
81540,0rcu_preempt3-21ksoftirqd/009:04:000
81540,0rcu_preempt3-21ksoftirqd/007:08:520
81540,0rcu_preempt0-21swapper/012:34:070
81540,0rcu_preempt0-21swapper/012:16:450
10050540,0irq/346-484840027981-1kworker/1:0H10:55:371
81530,0rcu_preempt54-21kswapd007:44:270
81530,0rcu_preempt3620-21kworker/0:011:30:040
81530,0rcu_preempt3-21ksoftirqd/011:58:550
81530,0rcu_preempt3-21ksoftirqd/008:03:470
81530,0rcu_preempt3-21ksoftirqd/007:33:510
9950520,0irq/345-48484007847-1kworker/1:0H12:01:361
81520,0rcu_preempt3-21ksoftirqd/007:17:570
81520,0rcu_preempt26983-21apt-get08:43:460
10050520,0irq/346-484840054-21kswapd011:52:141
10050520,0irq/346-484840054-21kswapd011:52:141
10050520,0irq/346-484840024791-1kworker/1:1H11:29:021
81510,0rcu_preempt3-21ksoftirqd/008:49:010
81500,0rcu_preempt15978-21kworker/0:307:29:410
10050500,0irq/346-484840027496-21rm11:47:171
81490,0rcu_preempt15978-21kworker/0:307:25:510
81490,0rcu_preempt15978-21kworker/0:307:18:550
9950480,0irq/345-484840031138-1kworker/1:0H10:13:501
9950480,0irq/345-484840031138-1kworker/1:0H10:13:501
81480,0rcu_preempt2632-21diskmemload11:41:171
10050480,0irq/346-484840054-21kswapd011:20:141
10050480,0irq/346-484840017711-21ssh10:29:561
81470,0rcu_preempt3-21ksoftirqd/007:03:510
10050470,0irq/346-484840054-21kswapd009:53:521
10050470,0irq/346-484840012702-1kworker/1:2H12:05:291
9950460,0irq/345-48484006813-1kworker/1:2H09:50:051
9950460,0irq/345-484840021398-1kworker/1:3H10:01:291
81460,0rcu_preempt2632-21diskmemload11:34:531
10050460,0irq/346-484840028757-21munin-node1
9950450,0irq/345-48484007848-21apt-get09:13:461
9950450,0irq/345-484840031326-21ping07:30:131
10050450,0irq/346-4848400851-21rngd07:54:171
10050450,0irq/346-484840028852-21ssh11:14:401
10050450,0irq/346-48484000-21swapper/109:25:191
81440,0rcu_preempt31326-21ping07:39:111
81430,0rcu_preempt19-21ksoftirqd/112:38:351
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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