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2026-04-05 - 11:29

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Sun Apr 05, 2026 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811320,0rcu_preempt3-21ksoftirqd/019:39:050
811170,0rcu_preempt3-21ksoftirqd/020:11:140
811110,0rcu_preempt3-21ksoftirqd/021:16:130
811060,0rcu_preempt3-21ksoftirqd/022:50:070
81970,0rcu_preempt3-21ksoftirqd/022:04:080
81920,0rcu_preempt3-21ksoftirqd/023:18:290
81890,0rcu_preempt3-21ksoftirqd/022:28:360
81870,0rcu_preempt23101-21kworker/0:221:32:050
81850,0rcu_preempt3-21ksoftirqd/023:56:060
81850,0rcu_preempt3-21ksoftirqd/023:56:060
81850,0rcu_preempt3-21ksoftirqd/023:52:480
81850,0rcu_preempt3-21ksoftirqd/023:31:580
81850,0rcu_preempt3-21ksoftirqd/019:59:260
81850,0rcu_preempt2944-21kworker/0:122:46:410
81850,0rcu_preempt17249-21kworker/0:123:04:040
81840,0rcu_preempt3-21ksoftirqd/023:46:460
81840,0rcu_preempt19773-21kworker/0:022:39:410
81830,0rcu_preempt3-21ksoftirqd/021:49:010
81820,0rcu_preempt3-21ksoftirqd/020:16:220
81810,0rcu_preempt3-21ksoftirqd/021:37:010
81810,0rcu_preempt3-21ksoftirqd/021:28:010
81810,0rcu_preempt3-21ksoftirqd/020:05:470
81810,0rcu_preempt17249-21kworker/0:123:03:240
81800,0rcu_preempt3-21ksoftirqd/023:25:120
81800,0rcu_preempt3-21ksoftirqd/021:00:020
81800,0rcu_preempt3-21ksoftirqd/020:51:060
81800,0rcu_preempt3-21ksoftirqd/020:46:300
81800,0rcu_preempt3-21ksoftirqd/019:57:300
81800,0rcu_preempt23547-21kworker/0:000:15:560
81800,0rcu_preempt18672-21ssh21:54:040
10050800,0irq/346-484840054-21kswapd023:39:160
81790,0rcu_preempt3-21ksoftirqd/023:36:530
81790,0rcu_preempt3-21ksoftirqd/023:21:500
81790,0rcu_preempt3-21ksoftirqd/023:10:000
81790,0rcu_preempt3-21ksoftirqd/020:58:230
81790,0rcu_preempt3-21ksoftirqd/020:29:290
81790,0rcu_preempt3-21ksoftirqd/020:22:570
81790,0rcu_preempt3-21ksoftirqd/019:19:040
81790,0rcu_preempt3-21ksoftirqd/000:24:320
81780,0rcu_preempt3-21ksoftirqd/022:54:290
81780,0rcu_preempt3-21ksoftirqd/022:30:080
81780,0rcu_preempt3-21ksoftirqd/019:17:070
81770,0rcu_preempt3-21ksoftirqd/021:40:570
81770,0rcu_preempt3-21ksoftirqd/021:06:510
81770,0rcu_preempt3-21ksoftirqd/020:41:420
81770,0rcu_preempt3-21ksoftirqd/020:23:420
81770,0rcu_preempt3-21ksoftirqd/019:12:390
81770,0rcu_preempt3-21ksoftirqd/000:03:060
81770,0rcu_preempt19773-21kworker/0:022:34:580
81760,0rcu_preempt3-21ksoftirqd/022:18:350
81760,0rcu_preempt3-21ksoftirqd/020:36:570
81760,0rcu_preempt3-21ksoftirqd/019:52:380
81760,0rcu_preempt3-21ksoftirqd/000:38:270
81760,0rcu_preempt0-21swapper/000:10:010
81750,0rcu_preempt3-21ksoftirqd/021:21:340
81750,0rcu_preempt3-21ksoftirqd/021:12:360
81750,0rcu_preempt3-21ksoftirqd/019:47:340
81750,0rcu_preempt3-21ksoftirqd/000:31:370
81740,0rcu_preempt3-21ksoftirqd/022:19:420
81740,0rcu_preempt3-21ksoftirqd/022:12:070
81740,0rcu_preempt3-21ksoftirqd/000:22:450
81740,0rcu_preempt3-21ksoftirqd/000:05:400
81730,0rcu_preempt3-21ksoftirqd/022:00:180
81730,0rcu_preempt3-21ksoftirqd/021:47:390
81710,0rcu_preempt3-21ksoftirqd/019:24:080
9950640,0irq/345-4848400181ktimersoftd/122:29:041
10050640,0irq/346-4848400171rcuc/122:51:501
9950630,0irq/345-4848400181ktimersoftd/123:05:541
81620,0rcu_preempt8081-21kworker/0:219:34:370
10050620,0irq/346-4848400181ktimersoftd/122:44:261
10050620,0irq/346-4848400181ktimersoftd/100:25:331
9950610,0irq/345-4848400181ktimersoftd/100:08:301
81610,0rcu_preempt19-21ksoftirqd/119:23:491
81610,0rcu_preempt10053-1kworker/1:0H21:49:021
10050610,0irq/346-4848400181ktimersoftd/123:18:521
9950580,0irq/345-4848400181ktimersoftd/122:42:331
9950570,0irq/345-484840081rcu_preempt23:26:111
10050570,0irq/346-48484000-21swapper/123:08:521
9950560,0irq/345-4848400171rcuc/121:09:171
9950550,0irq/345-4848400171rcuc/123:48:151
9950550,0irq/345-4848400171rcuc/121:47:201
10050550,0irq/346-48484000-21swapper/122:18:081
9950540,0irq/345-48484003065399cyclictest22:00:261
9950540,0irq/345-4848400171rcuc/123:52:421
9950540,0irq/345-4848400171rcuc/123:29:171
9950540,0irq/345-4848400171rcuc/121:17:221
10050540,0irq/346-48484006917-21ssh21:42:451
10050540,0irq/346-4848400181ktimersoftd/122:10:191
10050540,0irq/346-4848400181ktimersoftd/100:18:471
9950530,0irq/345-4848400171rcuc/123:55:391
9950530,0irq/345-4848400171rcuc/123:55:391
10050530,0irq/346-484840029575-21ssh00:15:481
10050530,0irq/346-4848400181ktimersoftd/122:19:291
10050530,0irq/346-4848400171rcuc/122:33:561
10050530,0irq/346-48484000-21swapper/123:35:351
10050520,0irq/346-4848400171rcuc/121:32:201
10050500,0irq/346-484840054-21kswapd000:30:231
81490,0rcu_preempt19-21ksoftirqd/119:05:131
10050490,0irq/346-484840021548-21sh23:02:421
10050490,0irq/346-4848400171rcuc/122:04:461
10050490,0irq/346-484840017013-21seq22:24:541
9950480,0irq/345-484840081rcu_preempt00:34:241
81480,0rcu_preempt3-21ksoftirqd/019:03:590
10050480,0irq/346-484840021640-21ssh21:57:311
4350470,0irq/32-433000005140-21ssh19:28:560
10050470,0irq/346-4848400392-21ssh21:35:501
10050470,0irq/346-4848400171rcuc/100:11:501
10050460,0irq/346-484840054-21kswapd000:02:011
10050460,0irq/346-48484000-21swapper/121:21:381
10050430,0irq/346-484840022320-1kworker/1:1H23:42:171
10050400,0irq/346-484840017567-1kworker/1:0H21:24:091
9950390,0irq/345-48484000-21swapper/120:43:581
9950380,0irq/345-48484003065399cyclictest23:18:181
10050380,0irq/346-484840054-21kswapd022:55:001
9950370,0irq/345-48484001526-21ping19:43:401
9950350,0irq/345-48484000-21swapper/120:23:531
10050350,0irq/346-48484003065399cyclictest19:56:041
10050350,0irq/346-48484000-21swapper/120:38:531
10050340,0irq/346-484840054-21kswapd020:09:011
10050340,0irq/346-48484003800-21wget21:03:531
10050340,0irq/346-484840014929-21wget19:58:541
81330,0rcu_preempt19-21ksoftirqd/119:44:061
10050330,0irq/346-48484000-21swapper/120:51:051
10050330,0irq/346-48484000-21swapper/120:15:591
81320,0rcu_preempt1142-1kworker/1:0H19:18:401
10050320,0irq/346-48484000-21swapper/120:03:541
10050310,0irq/346-48484000-21swapper/120:59:191
10050310,0irq/346-48484000-21swapper/119:13:001
81300,0rcu_preempt32016-21kworker/1:019:19:011
81300,0rcu_preempt19-21ksoftirqd/119:34:381
81300,0rcu_preempt14445-21ping20:19:071
9950290,0irq/345-48484000-21swapper/119:31:001
10050290,0irq/346-48484000-21swapper/120:30:091
30653992810,0cyclictest2006-21cat20:58:401
10050280,0irq/346-48484000-21swapper/120:33:501
3065399272,0cyclictest0-21swapper/119:52:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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