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2026-06-04 - 12:26

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 highest latencies:
System rackaslot5s.osadl.org (updated Thu Jun 04, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811250,0rcu_preempt26944-1kworker/1:1H23:18:061
81890,0rcu_preempt16502-21kworker/0:223:15:570
81880,0rcu_preempt3-21ksoftirqd/021:52:040
81880,0rcu_preempt18376-21kworker/0:022:03:240
81870,0rcu_preempt3-21ksoftirqd/021:53:350
81870,0rcu_preempt3-21ksoftirqd/019:50:130
81860,0rcu_preempt3-21ksoftirqd/022:26:530
81860,0rcu_preempt3-21ksoftirqd/020:17:320
81850,0rcu_preempt3-21ksoftirqd/023:46:060
81850,0rcu_preempt3-21ksoftirqd/020:05:590
81840,0rcu_preempt18376-21kworker/0:022:32:460
81840,0rcu_preempt17948-21kworker/0:120:07:510
81840,0rcu_preempt10255-21kworker/0:200:22:320
81830,0rcu_preempt3-21ksoftirqd/022:53:520
81830,0rcu_preempt3-21ksoftirqd/000:16:080
81830,0rcu_preempt31113-21kworker/0:022:46:530
81820,0rcu_preempt3-21ksoftirqd/023:10:320
81820,0rcu_preempt3-21ksoftirqd/022:20:060
81820,0rcu_preempt3-21ksoftirqd/021:35:160
81820,0rcu_preempt3-21ksoftirqd/020:29:330
81820,0rcu_preempt22923-21kworker/0:221:20:180
81810,0rcu_preempt3-21ksoftirqd/023:55:300
81810,0rcu_preempt3-21ksoftirqd/022:16:350
81810,0rcu_preempt3-21ksoftirqd/000:35:540
81810,0rcu_preempt3-21ksoftirqd/000:31:440
81810,0rcu_preempt3-21ksoftirqd/000:12:400
81810,0rcu_preempt16502-21kworker/0:223:30:400
81800,0rcu_preempt54-21kswapd020:46:200
81800,0rcu_preempt3-21ksoftirqd/022:38:590
81800,0rcu_preempt3-21ksoftirqd/021:41:440
81800,0rcu_preempt3-21ksoftirqd/020:23:360
81800,0rcu_preempt3-21ksoftirqd/019:28:170
81800,0rcu_preempt3-21ksoftirqd/000:06:470
81800,0rcu_preempt3-21ksoftirqd/000:06:470
81800,0rcu_preempt32181-21diskmemload22:50:200
81800,0rcu_preempt2441-21kworker/0:121:26:500
81800,0rcu_preempt18376-21kworker/0:022:31:230
81790,0rcu_preempt3-21ksoftirqd/023:58:070
81790,0rcu_preempt3-21ksoftirqd/023:38:410
81790,0rcu_preempt3-21ksoftirqd/021:45:270
81790,0rcu_preempt3-21ksoftirqd/021:14:260
81790,0rcu_preempt3-21ksoftirqd/019:57:070
81790,0rcu_preempt3-21ksoftirqd/000:23:210
81780,0rcu_preempt3-21ksoftirqd/023:34:080
81780,0rcu_preempt3-21ksoftirqd/023:23:150
81780,0rcu_preempt3-21ksoftirqd/023:23:150
81780,0rcu_preempt3-21ksoftirqd/023:19:430
81780,0rcu_preempt3-21ksoftirqd/020:20:310
81780,0rcu_preempt17948-21kworker/0:120:02:410
81770,0rcu_preempt3-21ksoftirqd/021:58:330
81770,0rcu_preempt3-21ksoftirqd/020:37:210
81770,0rcu_preempt16502-21kworker/0:223:52:300
81750,0rcu_preempt3-21ksoftirqd/022:59:280
81750,0rcu_preempt3-21ksoftirqd/022:08:010
81740,0rcu_preempt3-21ksoftirqd/021:27:550
81740,0rcu_preempt3-21ksoftirqd/021:27:550
81740,0rcu_preempt3-21ksoftirqd/020:39:450
81730,0rcu_preempt3-21ksoftirqd/021:09:580
81730,0rcu_preempt3-21ksoftirqd/020:59:090
81730,0rcu_preempt3-21ksoftirqd/019:14:210
81720,0rcu_preempt3-21ksoftirqd/023:02:460
81720,0rcu_preempt3-21ksoftirqd/021:04:030
81710,0rcu_preempt3-21ksoftirqd/019:09:330
81700,0rcu_preempt3-21ksoftirqd/020:57:260
81700,0rcu_preempt3-21ksoftirqd/020:52:370
81690,0rcu_preempt1024-21nfsv4.0-svc19:27:420
81670,0rcu_preempt3-21ksoftirqd/019:38:130
81670,0rcu_preempt3-21ksoftirqd/019:18:570
81670,0rcu_preempt3-21ksoftirqd/019:18:570
81650,0rcu_preempt851-21rngd19:37:030
10050630,0irq/346-4848400181ktimersoftd/122:00:471
9950580,0irq/345-4848400181ktimersoftd/122:10:161
9950560,0irq/345-4848400181ktimersoftd/122:16:261
10050540,0irq/346-48484005731-1kworker/1:2H22:24:381
9950530,0irq/345-4848400851-21rngd23:07:131
10050520,0irq/346-484840020892-21latency_hist20:17:431
10050510,0irq/346-48484005121-21cyclictest22:29:511
10050510,0irq/346-484840025340-21ls00:18:101
10050510,0irq/346-484840011414-1kworker/1:2H00:07:551
81500,0rcu_preempt3614-21apt-get19:02:531
81500,0rcu_preempt19-21ksoftirqd/121:07:431
10050500,0irq/346-484840019269-1kworker/1:2H23:56:211
9950480,0irq/345-484840023312-1kworker/1:2H22:06:431
9950480,0irq/345-484840021282-1kworker/1:2H00:28:211
10050480,0irq/346-484840021282-1kworker/1:2H00:33:421
9950470,0irq/345-4848400851-21rngd23:10:121
10050470,0irq/346-484840054-21kswapd023:51:171
10050460,0irq/346-48484002991-1kworker/1:1H22:52:101
10050460,0irq/346-48484000-21swapper/019:03:040
10050450,0irq/346-484840026247-1kworker/1:1H00:23:291
10050450,0irq/346-484840016173-21ping20:08:091
10050440,0irq/346-484840054-21kswapd021:38:371
10050440,0irq/346-484840024324-21ssh23:44:151
10050430,0irq/346-484840054-21kswapd022:38:211
10050430,0irq/346-484840020484-21taskset22:34:521
10050430,0irq/346-4848400187362sleep121:27:491
10050430,0irq/346-4848400187362sleep121:27:491
81420,0rcu_preempt3194-21apt-get22:17:531
81420,0rcu_preempt19-21ksoftirqd/119:59:181
10050420,0irq/346-48484007384-21ssh21:16:021
10050420,0irq/346-48484000-21swapper/120:59:401
9950410,0irq/345-48484008481-1kworker/1:2H21:52:241
81410,0rcu_preempt19-21ksoftirqd/121:52:571
81410,0rcu_preempt19-21ksoftirqd/119:45:041
81410,0rcu_preempt19-21ksoftirqd/119:41:371
81410,0rcu_preempt19-21ksoftirqd/119:36:101
10050410,0irq/346-484840054-21kswapd021:47:421
10050410,0irq/346-484840023168-21latency_hist20:27:421
10050410,0irq/346-484840019515-21ssh00:12:571
10050410,0irq/346-48484000-21swapper/122:52:551
81400,0rcu_preempt19-21ksoftirqd/122:46:161
81400,0rcu_preempt19-21ksoftirqd/119:30:021
81400,0rcu_preempt16173-21ping19:56:001
10050400,0irq/346-48484005121-21cyclictest23:42:381
81390,0rcu_preempt32181-21diskmemload23:57:541
81390,0rcu_preempt19-21ksoftirqd/123:32:571
81390,0rcu_preempt19-21ksoftirqd/123:02:421
81390,0rcu_preempt19-21ksoftirqd/121:06:271
10050390,0irq/346-484840023926-21dropbear21:32:571
10050390,0irq/346-4848400107532sleep123:30:551
9950380,0irq/345-48484002443-1kworker/1:1H21:22:161
81380,0rcu_preempt7374-21ping19:23:441
10050380,0irq/346-48484003902-21ssh23:23:231
10050380,0irq/346-48484003902-21ssh23:23:231
10050380,0irq/346-484840028964-21ssh23:16:431
10050380,0irq/346-484840013862-21ssh21:22:531
10050380,0irq/346-484840011322-21ssh00:04:021
10050380,0irq/346-484840011322-21ssh00:04:021
81370,0rcu_preempt19-21ksoftirqd/120:53:391
81370,0rcu_preempt19-21ksoftirqd/120:46:351
81370,0rcu_preempt19-21ksoftirqd/120:33:051
81370,0rcu_preempt19-21ksoftirqd/120:30:571
81370,0rcu_preempt15665-21runrttasks19:51:391
81370,0rcu_preempt0-21swapper/019:42:550
10050370,0irq/346-484840016173-21ping20:13:081
81360,0rcu_preempt19-21ksoftirqd/120:38:031
81360,0rcu_preempt19-21ksoftirqd/119:14:181
81360,0rcu_preempt19-21ksoftirqd/119:10:351
9950350,0irq/345-48484000-21swapper/119:17:581
9950350,0irq/345-48484000-21swapper/119:17:581
10050350,0irq/346-484840016173-21ping20:07:191
81340,0rcu_preempt1470-21runrttasks20:48:091
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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