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2026-04-06 - 12:45

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 highest latencies:
System rackaslot5s.osadl.org (updated Mon Apr 06, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811440,0rcu_preempt26518-21ssh23:43:570
81940,0rcu_preempt0-21swapper/123:20:361
81930,0rcu_preempt54-21kswapd023:41:291
81930,0rcu_preempt54-21kswapd000:05:341
81930,0rcu_preempt0-21swapper/100:00:361
81920,0rcu_preempt21935-21ssh23:06:041
81900,0rcu_preempt54-21kswapd022:27:051
81890,0rcu_preempt19-21ksoftirqd/123:48:081
81880,0rcu_preempt19-21ksoftirqd/122:02:411
81870,0rcu_preempt54-21kswapd023:11:311
81870,0rcu_preempt54-21kswapd023:11:311
81860,0rcu_preempt19-21ksoftirqd/121:25:591
81850,0rcu_preempt19-21ksoftirqd/123:03:131
81850,0rcu_preempt19-21ksoftirqd/122:04:021
81840,0rcu_preempt19-21ksoftirqd/100:15:451
81810,0rcu_preempt19-21ksoftirqd/121:31:481
81810,0rcu_preempt19-21ksoftirqd/119:48:581
81790,0rcu_preempt0-21swapper/122:56:121
81780,0rcu_preempt19-21ksoftirqd/122:45:201
81770,0rcu_preempt19-21ksoftirqd/121:55:021
81760,0rcu_preempt19-21ksoftirqd/123:14:431
81760,0rcu_preempt19-21ksoftirqd/121:53:371
81750,0rcu_preempt0-21swapper/100:36:081
10050740,0irq/346-4848400171rcuc/123:30:001
81730,0rcu_preempt19-21ksoftirqd/119:13:541
9950710,0irq/345-4848400171rcuc/121:41:461
81710,0rcu_preempt8562-21ssh21:46:331
81690,0rcu_preempt1339-21snmpd22:29:150
81670,0rcu_preempt19-21ksoftirqd/121:33:591
10050670,0irq/346-4848400171rcuc/100:19:041
81660,0rcu_preempt19-21ksoftirqd/100:23:501
81650,0rcu_preempt3-21ksoftirqd/022:48:420
81650,0rcu_preempt19-21ksoftirqd/123:50:541
81650,0rcu_preempt19-21ksoftirqd/122:40:461
81640,0rcu_preempt3-21ksoftirqd/023:19:020
81640,0rcu_preempt13488-21kworker/0:122:43:590
10050640,0irq/346-4848400171rcuc/122:49:591
10050640,0irq/346-4848400162702sleep121:21:211
9950630,0irq/345-4848400181ktimersoftd/122:37:431
81630,0rcu_preempt3-21ksoftirqd/023:59:000
10050630,0irq/346-484840025148-1kworker/0:1H21:35:080
10050630,0irq/346-4848400171rcuc/100:31:341
10050630,0irq/346-484840011553-1kworker/0:1H23:08:470
10050630,0irq/346-484840011553-1kworker/0:1H23:08:470
81610,0rcu_preempt19-21ksoftirqd/120:12:461
81610,0rcu_preempt19-21ksoftirqd/120:12:461
81600,0rcu_preempt54-21kswapd000:11:531
81600,0rcu_preempt28660-21cyclictest21:10:420
81590,0rcu_preempt3-21ksoftirqd/023:23:560
81590,0rcu_preempt19-21ksoftirqd/122:33:071
81570,0rcu_preempt27510-21kworker/0:200:13:500
81570,0rcu_preempt19-21ksoftirqd/121:13:411
81570,0rcu_preempt19-21ksoftirqd/119:03:581
10050570,0irq/346-48484003-21ksoftirqd/022:18:180
10050570,0irq/346-4848400171rcuc/123:27:191
81560,0rcu_preempt851-21rngd22:58:400
81560,0rcu_preempt19-21ksoftirqd/122:14:081
10050560,0irq/346-48484003-21ksoftirqd/023:35:270
10050560,0irq/346-484840025523-1kworker/0:0H20:40:000
10050560,0irq/346-4848400171rcuc/123:57:011
81550,0rcu_preempt19-21ksoftirqd/120:58:511
81550,0rcu_preempt19-21ksoftirqd/119:53:571
10050550,0irq/346-484840011165-21ssh22:54:510
9950540,0irq/345-48484000-21swapper/000:22:120
81540,0rcu_preempt54-21kswapd020:13:511
81540,0rcu_preempt19-21ksoftirqd/120:21:021
81540,0rcu_preempt19-21ksoftirqd/119:59:501
81540,0rcu_preempt13488-21kworker/0:122:33:590
9950530,0irq/345-484840022665-21aten_rapower_cu20:28:500
9950530,0irq/345-48484000-21swapper/022:12:490
81530,0rcu_preempt3-21ksoftirqd/021:58:390
81530,0rcu_preempt19-21ksoftirqd/122:19:061
81530,0rcu_preempt19-21ksoftirqd/121:09:001
81530,0rcu_preempt19-21ksoftirqd/119:46:411
10050530,0irq/346-48484003542-21ssh21:41:240
81520,0rcu_preempt3-21ksoftirqd/022:21:100
81520,0rcu_preempt30072-21ssh22:08:511
81520,0rcu_preempt19-21ksoftirqd/120:53:541
81520,0rcu_preempt19-21ksoftirqd/120:25:221
10050520,0irq/346-484840022276-1kworker/0:0H22:02:420
81510,0rcu_preempt19-21ksoftirqd/123:37:301
81510,0rcu_preempt19-21ksoftirqd/120:06:141
10050510,0irq/346-48484005941-21ssh23:55:370
10050510,0irq/346-484840022487-21chrt23:06:480
10050510,0irq/346-48484001389-21ssh23:51:060
9950500,0irq/345-484840021268-21ssh21:26:280
81500,0rcu_preempt3-21ksoftirqd/020:19:030
81500,0rcu_preempt19-21ksoftirqd/120:28:501
10050500,0irq/346-484840029919-21ssh22:41:160
81490,0rcu_preempt3-21ksoftirqd/021:53:390
81490,0rcu_preempt26209-21php-cgi20:38:551
81490,0rcu_preempt19-21ksoftirqd/121:04:351
10050490,0irq/346-484840054-21kswapd021:28:400
10050490,0irq/346-484840018947-21ssh00:09:020
81480,0rcu_preempt3-21ksoftirqd/020:04:070
81480,0rcu_preempt19-21ksoftirqd/119:29:061
81480,0rcu_preempt19-21ksoftirqd/119:08:581
2866299487,0cyclictest31940-21ping19:34:001
2866299481,0cyclictest28221-21ntpdc20:44:001
10050480,0irq/346-484840021974-21meminfo23:39:010
9950470,0irq/345-484840027154-21apt-get19:03:500
9950470,0irq/345-48484000-21swapper/000:30:040
81470,0rcu_preempt3-21ksoftirqd/021:15:220
81470,0rcu_preempt3-21ksoftirqd/020:24:080
81470,0rcu_preempt3-21ksoftirqd/019:13:500
81470,0rcu_preempt19-21ksoftirqd/120:34:041
10050470,0irq/346-484840054-21kswapd023:31:490
10050470,0irq/346-484840022276-1kworker/0:0H22:04:280
9950460,0irq/345-48484000-21swapper/022:24:410
81460,0rcu_preempt3-21ksoftirqd/020:48:560
81460,0rcu_preempt3-21ksoftirqd/019:59:090
81460,0rcu_preempt19-21ksoftirqd/119:38:471
81460,0rcu_preempt19-21ksoftirqd/119:19:281
81460,0rcu_preempt0-21swapper/000:25:170
10050460,0irq/346-484840010797-1kworker/0:1H00:03:560
81450,0rcu_preempt3-21ksoftirqd/019:53:450
81450,0rcu_preempt19-21ksoftirqd/119:26:351
2866299452,0cyclictest0-21swapper/120:48:501
10050450,0irq/346-484840054-21kswapd021:46:170
10050450,0irq/346-48484000-21swapper/000:37:010
81440,0rcu_preempt3239-21diskmemload21:18:460
81440,0rcu_preempt3-21ksoftirqd/021:07:570
10050440,0irq/346-484840031837-21ssh23:16:090
10050440,0irq/346-484840030370-1kworker/0:1H20:53:560
81420,0rcu_preempt3-21ksoftirqd/020:37:060
81420,0rcu_preempt3-21ksoftirqd/020:18:390
1599420,0migration/032625-21aten_rapower_vo20:58:530
10050420,0irq/346-484840028637-1kworker/0:1H19:09:020
10050420,0irq/346-48484000-21swapper/019:40:500
10050410,0irq/346-484840015590-1kworker/0:0H20:09:070
10050410,0irq/346-484840015590-1kworker/0:0H20:09:070
9950400,0irq/345-484840010518-21head19:49:050
81390,0rcu_preempt4867-21php-cgi19:33:580
81390,0rcu_preempt3-21ksoftirqd/020:44:400
81390,0rcu_preempt3-21ksoftirqd/019:48:130
81380,0rcu_preempt31940-21ping19:23:510
81370,0rcu_preempt3-21ksoftirqd/019:19:100
2866199352,0cyclictest31940-21ping19:28:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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