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2026-04-23 - 20:02

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 23, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811010,0rcu_preempt3-21ksoftirqd/011:24:000
811000,0rcu_preempt3-21ksoftirqd/009:23:340
81960,0rcu_preempt3-21ksoftirqd/011:34:400
81960,0rcu_preempt3-21ksoftirqd/009:48:470
81940,0rcu_preempt3-21ksoftirqd/010:49:060
81940,0rcu_preempt3-21ksoftirqd/010:49:060
81800,0rcu_preempt1662-21ssh12:37:550
81790,0rcu_preempt3-21ksoftirqd/009:59:430
10050770,0irq/346-484840054-21kswapd011:52:230
81760,0rcu_preempt3-21ksoftirqd/009:43:520
81760,0rcu_preempt3-21ksoftirqd/009:18:500
81750,0rcu_preempt2907-21apt-get08:08:330
10050750,0irq/346-48484003388-1kworker/0:2H09:55:120
81740,0rcu_preempt27843-21ps07:43:510
10050730,0irq/346-484840023092-1kworker/0:1H09:12:550
81720,0rcu_preempt3-21ksoftirqd/010:38:490
81720,0rcu_preempt13855-21kworker/0:010:57:510
10050720,0irq/346-484840014304-21ssh11:11:161
81710,0rcu_preempt6385-21kworker/0:012:13:130
81710,0rcu_preempt16965-21kworker/0:111:44:030
81710,0rcu_preempt16965-21kworker/0:111:39:120
81710,0rcu_preempt13855-21kworker/0:011:01:410
81710,0rcu_preempt12850-21kworker/0:107:18:410
81700,0rcu_preempt7367-21kworker/0:209:38:530
81700,0rcu_preempt6385-21kworker/0:012:16:380
81700,0rcu_preempt2863-21kworker/0:210:28:400
81700,0rcu_preempt2863-21kworker/0:210:28:400
81700,0rcu_preempt22145-21kworker/0:212:31:310
81700,0rcu_preempt16965-21kworker/0:111:18:570
81700,0rcu_preempt14244-21kworker/0:008:53:430
81700,0rcu_preempt13855-21kworker/0:011:57:490
81700,0rcu_preempt12850-21kworker/0:107:38:540
81700,0rcu_preempt12270-21dropbear10:03:370
81690,0rcu_preempt1470-21runrttasks09:29:060
81690,0rcu_preempt13855-21kworker/0:011:08:190
81690,0rcu_preempt12850-21kworker/0:107:28:390
81680,0rcu_preempt775-21kworker/0:112:06:050
81680,0rcu_preempt3-21ksoftirqd/012:23:380
81680,0rcu_preempt3-21ksoftirqd/009:13:310
81680,0rcu_preempt30100-21ssh10:21:350
81680,0rcu_preempt16965-21kworker/0:111:29:170
81680,0rcu_preempt0-21swapper/010:13:190
81670,0rcu_preempt3-21ksoftirqd/009:36:500
81670,0rcu_preempt2863-21kworker/0:210:38:200
81670,0rcu_preempt14244-21kworker/0:010:24:590
81670,0rcu_preempt13855-21kworker/0:010:47:300
81660,0rcu_preempt6385-21kworker/0:012:19:030
81660,0rcu_preempt3-21ksoftirqd/011:16:510
81660,0rcu_preempt3-21ksoftirqd/011:12:120
81660,0rcu_preempt3-21ksoftirqd/008:23:500
81660,0rcu_preempt3-21ksoftirqd/008:18:380
81650,0rcu_preempt3-21ksoftirqd/012:01:260
81650,0rcu_preempt3-21ksoftirqd/008:13:540
81640,0rcu_preempt3-21ksoftirqd/010:13:350
81640,0rcu_preempt3-21ksoftirqd/009:03:340
81640,0rcu_preempt3-21ksoftirqd/008:48:400
81640,0rcu_preempt3-21ksoftirqd/008:05:180
81640,0rcu_preempt3-21ksoftirqd/007:13:460
81630,0rcu_preempt9035-21kworker/0:108:38:450
81630,0rcu_preempt3-21ksoftirqd/007:48:460
81630,0rcu_preempt3-21ksoftirqd/007:08:230
81620,0rcu_preempt3-21ksoftirqd/008:58:350
81620,0rcu_preempt3-21ksoftirqd/008:43:440
81620,0rcu_preempt3-21ksoftirqd/008:43:440
81620,0rcu_preempt3-21ksoftirqd/008:02:050
81620,0rcu_preempt19-21ksoftirqd/110:28:391
81620,0rcu_preempt19-21ksoftirqd/110:28:391
10050620,0irq/346-484840020808-21munin-node1
81610,0rcu_preempt3-21ksoftirqd/007:28:110
81600,0rcu_preempt3-21ksoftirqd/007:53:420
81600,0rcu_preempt3-21ksoftirqd/007:36:360
81590,0rcu_preempt3-21ksoftirqd/008:33:330
81590,0rcu_preempt3-21ksoftirqd/008:28:350
10050590,0irq/346-484840030769-1kworker/1:1H10:59:571
10050590,0irq/346-484840015339-1kworker/1:3H11:53:501
10050580,0irq/346-484840054-21kswapd010:54:151
10050570,0irq/346-48484000-21swapper/109:54:571
9950560,0irq/345-4848400171rcuc/111:39:071
9950560,0irq/345-48484001549099cyclictest10:38:231
10050560,0irq/346-48484000-21swapper/110:19:361
10050550,0irq/346-484840024830-21ssh10:16:111
81540,0rcu_preempt3-21ksoftirqd/007:08:320
10050540,0irq/346-484840054-21kswapd011:27:231
9950530,0irq/345-48484001549099cyclictest11:28:461
81530,0rcu_preempt19-21ksoftirqd/111:48:231
9950520,0irq/345-484840030136-1kworker/1:2H12:03:291
9950520,0irq/345-484840030126-1kworker/1:3H09:19:581
10050520,0irq/346-484840054-21kswapd009:41:281
10050520,0irq/346-48484000-21swapper/110:34:011
9950510,0irq/345-48484008129-1kworker/1:0H11:43:591
10050510,0irq/346-484840023511-21ssh10:48:091
10050510,0irq/346-484840010616-21ssh11:07:551
10050510,0irq/346-48484000-21swapper/109:46:041
10050500,0irq/346-484840054-21kswapd010:05:281
10050500,0irq/346-484840024397-21ssh09:09:231
10050500,0irq/346-484840018847-21ssh10:09:481
10050500,0irq/346-48484000-21swapper/110:00:501
9950490,0irq/345-4848400459-1kworker/1:1H11:37:281
9950490,0irq/345-484840027132-1kworker/1:1H12:33:001
9950490,0irq/345-48484002673-1kworker/1:1H09:26:311
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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