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2026-03-17 - 12:44

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 highest latencies:
System rackaslot5s.osadl.org (updated Tue Mar 17, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811350,0rcu_preempt3-21ksoftirqd/023:53:570
81760,0rcu_preempt19-21ksoftirqd/121:39:121
81760,0rcu_preempt19-21ksoftirqd/121:39:121
10050760,0irq/346-484840054-21kswapd000:24:130
81740,0rcu_preempt30552-21kworker/0:123:26:110
10050720,0irq/346-484840054-21kswapd023:30:580
10050710,0irq/346-48484008361-1kworker/0:0H21:52:190
81690,0rcu_preempt30469-21ssh22:46:171
10050690,0irq/346-48484001234-1kworker/0:2H21:15:020
81680,0rcu_preempt3-21ksoftirqd/019:09:190
81680,0rcu_preempt19-21ksoftirqd/121:14:321
81680,0rcu_preempt13688-21ssh23:02:171
81680,0rcu_preempt0-21swapper/123:18:251
10050680,0irq/346-484840016056-1kworker/0:0H21:29:510
81670,0rcu_preempt19-21ksoftirqd/122:30:391
81670,0rcu_preempt19-21ksoftirqd/100:29:531
10050670,0irq/346-48484005692-1kworker/0:2H22:24:410
81660,0rcu_preempt19-21ksoftirqd/121:49:091
81660,0rcu_preempt19-21ksoftirqd/121:27:081
10050660,0irq/346-4848400851-21rngd22:07:210
10050660,0irq/346-484840028162-1kworker/0:0H22:13:570
81650,0rcu_preempt3-21ksoftirqd/020:04:070
81650,0rcu_preempt19-21ksoftirqd/121:47:301
81650,0rcu_preempt19-21ksoftirqd/120:08:561
81650,0rcu_preempt19-21ksoftirqd/100:24:311
81640,0rcu_preempt19-21ksoftirqd/120:33:091
81640,0rcu_preempt19-21ksoftirqd/100:23:471
81640,0rcu_preempt19-21ksoftirqd/100:23:471
81630,0rcu_preempt19-21ksoftirqd/123:19:201
81620,0rcu_preempt54-21kswapd023:29:061
81620,0rcu_preempt5332-21ssh22:54:091
81620,0rcu_preempt5332-21ssh22:54:091
81620,0rcu_preempt3-21ksoftirqd/000:11:380
81620,0rcu_preempt19-21ksoftirqd/122:19:081
81620,0rcu_preempt19-21ksoftirqd/119:54:101
4350620,0irq/32-4330000054-21kswapd022:34:151
81610,0rcu_preempt19-21ksoftirqd/123:55:061
81610,0rcu_preempt19-21ksoftirqd/123:39:301
81610,0rcu_preempt19-21ksoftirqd/122:49:151
81610,0rcu_preempt19-21ksoftirqd/119:09:201
81600,0rcu_preempt54-21kswapd022:58:380
81600,0rcu_preempt54-21kswapd022:58:380
81600,0rcu_preempt3-21ksoftirqd/023:13:100
81600,0rcu_preempt3-21ksoftirqd/021:22:580
81600,0rcu_preempt19-21ksoftirqd/123:50:241
81600,0rcu_preempt19-21ksoftirqd/123:44:101
81600,0rcu_preempt19-21ksoftirqd/123:38:491
81600,0rcu_preempt19-21ksoftirqd/123:24:261
81600,0rcu_preempt19-21ksoftirqd/122:09:091
81600,0rcu_preempt19-21ksoftirqd/121:11:161
81600,0rcu_preempt19-21ksoftirqd/120:54:201
81600,0rcu_preempt19-21ksoftirqd/120:19:231
81590,0rcu_preempt3-21ksoftirqd/019:59:080
81580,0rcu_preempt54-21kswapd022:41:120
81580,0rcu_preempt21306-21apt-get20:39:101
81580,0rcu_preempt19-21ksoftirqd/123:09:531
81580,0rcu_preempt19-21ksoftirqd/122:28:131
81580,0rcu_preempt19-21ksoftirqd/120:16:421
81580,0rcu_preempt19-21ksoftirqd/100:14:281
81580,0rcu_preempt1234-1kworker/0:2H21:11:320
81560,0rcu_preempt3-21ksoftirqd/023:41:210
81560,0rcu_preempt3-21ksoftirqd/000:38:370
81560,0rcu_preempt30999-21diskmemload21:34:241
81560,0rcu_preempt19-21ksoftirqd/121:19:481
81560,0rcu_preempt19-21ksoftirqd/120:26:291
81550,0rcu_preempt3-21ksoftirqd/020:14:220
81550,0rcu_preempt25395-21kworker/0:223:04:150
81550,0rcu_preempt19-21ksoftirqd/120:44:121
81550,0rcu_preempt19-21ksoftirqd/120:00:471
81550,0rcu_preempt19-21ksoftirqd/100:12:221
10050550,0irq/346-484840054-21kswapd000:08:031
81540,0rcu_preempt19-21ksoftirqd/120:49:211
81530,0rcu_preempt19-21ksoftirqd/122:14:251
81530,0rcu_preempt19-21ksoftirqd/121:29:181
81530,0rcu_preempt19-21ksoftirqd/121:04:171
10050530,0irq/346-484840054-21kswapd022:53:290
81520,0rcu_preempt3-21ksoftirqd/022:34:260
81520,0rcu_preempt3-21ksoftirqd/019:49:330
81520,0rcu_preempt19-21ksoftirqd/123:59:201
81520,0rcu_preempt19-21ksoftirqd/100:34:181
10050520,0irq/346-484840054-21kswapd023:48:580
81510,0rcu_preempt3-21ksoftirqd/023:13:590
81510,0rcu_preempt3-21ksoftirqd/019:06:130
81510,0rcu_preempt19-21ksoftirqd/121:54:241
81510,0rcu_preempt19-21ksoftirqd/120:34:231
9950500,0irq/345-4848400851-21rngd21:24:270
81500,0rcu_preempt31498-21kworker/0:023:54:280
81500,0rcu_preempt30999-21diskmemload23:04:181
10050500,0irq/346-484840054-21kswapd021:56:150
10050500,0irq/346-484840024223-21ssh22:07:271
81490,0rcu_preempt5617-21kworker/u4:222:44:190
81490,0rcu_preempt3-21ksoftirqd/020:28:590
81490,0rcu_preempt3-21ksoftirqd/020:27:530
81490,0rcu_preempt19-21ksoftirqd/121:59:191
10050490,0irq/346-48484000-21swapper/022:29:230
9950480,0irq/345-484840030881-1kworker/0:2H21:44:370
81480,0rcu_preempt54-21kswapd019:20:091
81480,0rcu_preempt3-21ksoftirqd/020:59:070
81480,0rcu_preempt30552-21kworker/0:100:29:160
81480,0rcu_preempt24543-21kworker/0:122:14:050
81480,0rcu_preempt19-21ksoftirqd/119:44:321
81480,0rcu_preempt19-21ksoftirqd/119:29:221
81470,0rcu_preempt851-21rngd23:00:380
81470,0rcu_preempt3-21ksoftirqd/020:23:580
81470,0rcu_preempt3-21ksoftirqd/000:20:200
81470,0rcu_preempt3-21ksoftirqd/000:20:200
81470,0rcu_preempt22298-21kworker/0:221:39:170
81470,0rcu_preempt22298-21kworker/0:221:39:170
81470,0rcu_preempt19-21ksoftirqd/122:39:261
81470,0rcu_preempt19-21ksoftirqd/120:59:081
81470,0rcu_preempt19-21ksoftirqd/120:09:251
81460,0rcu_preempt3-21ksoftirqd/020:13:590
81460,0rcu_preempt15631-21ssh21:58:590
10050460,0irq/346-484840024369-21ps21:34:240
81450,0rcu_preempt54-21kswapd023:34:080
81450,0rcu_preempt19-21ksoftirqd/119:39:191
10050450,0irq/346-484840054-21kswapd023:20:180
10050450,0irq/346-484840030256-1kworker/0:0H19:34:190
81440,0rcu_preempt3-21ksoftirqd/019:28:590
81440,0rcu_preempt31713-21kworker/0:119:41:320
81440,0rcu_preempt19-21ksoftirqd/119:35:441
81440,0rcu_preempt19-21ksoftirqd/119:25:271
24007994429,0cyclictest4865-21apt-get19:49:111
13250440,0irq/301-48020003409-21dropbear19:44:130
81430,0rcu_preempt3-21ksoftirqd/000:14:280
81430,0rcu_preempt3-21ksoftirqd/000:01:090
24006994310,0cyclictest22571-1kworker/0:1H00:05:240
81420,0rcu_preempt3-21ksoftirqd/022:19:250
81420,0rcu_preempt30722-21apt-get19:29:100
24007994218,0cyclictest26489-21munin-node1
10050410,0irq/346-484840030705-1kworker/0:0H21:05:560
81400,0rcu_preempt3-21ksoftirqd/020:35:070
81400,0rcu_preempt3-21ksoftirqd/019:18:460
10050400,0irq/346-48484000-21swapper/020:55:550
10050400,0irq/346-48484000-21swapper/020:39:230
81390,0rcu_preempt3-21ksoftirqd/020:49:230
81390,0rcu_preempt3-21ksoftirqd/019:58:580
81380,0rcu_preempt27648-21df_abs19:19:140
4350380,0irq/32-433000000-21swapper/119:04:111
81370,0rcu_preempt3-21ksoftirqd/020:44:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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