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2026-07-17 - 15:51

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Fri Jul 17, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811360,0rcu_preempt19-21ksoftirqd/109:11:481
811270,0rcu_preempt3-21ksoftirqd/007:02:150
10050870,0irq/346-4848400111rcuc/012:22:460
10050790,0irq/346-484840041ktimersoftd/012:04:510
10050790,0irq/346-484840041ktimersoftd/010:39:000
10050790,0irq/346-4848400111rcuc/011:36:590
10050760,0irq/346-484840041ktimersoftd/011:04:030
81740,0rcu_preempt19-21ksoftirqd/112:24:161
81740,0rcu_preempt19-21ksoftirqd/111:43:221
10050740,0irq/346-484840041ktimersoftd/010:50:230
81730,0rcu_preempt3-21ksoftirqd/011:49:250
10050730,0irq/346-4848400111rcuc/009:16:590
81710,0rcu_preempt3-21ksoftirqd/009:52:300
81710,0rcu_preempt19-21ksoftirqd/109:49:541
81700,0rcu_preempt19-21ksoftirqd/112:17:241
81690,0rcu_preempt3-21ksoftirqd/012:12:560
81680,0rcu_preempt19-21ksoftirqd/112:17:001
81680,0rcu_preempt19-21ksoftirqd/110:08:421
81680,0rcu_preempt19-21ksoftirqd/110:00:511
81680,0rcu_preempt19-21ksoftirqd/109:29:171
615399681,0cyclictest0-21swapper/010:12:470
10050680,0irq/346-484840016638-1kworker/0:1H11:58:580
81670,0rcu_preempt54-21kswapd007:57:220
81670,0rcu_preempt3-21ksoftirqd/011:25:330
81670,0rcu_preempt19-21ksoftirqd/110:31:061
81660,0rcu_preempt19-21ksoftirqd/111:54:291
81660,0rcu_preempt19-21ksoftirqd/111:37:481
81660,0rcu_preempt19-21ksoftirqd/109:24:551
81650,0rcu_preempt19-21ksoftirqd/111:27:251
81650,0rcu_preempt19-21ksoftirqd/111:17:511
81650,0rcu_preempt19-21ksoftirqd/110:41:261
81640,0rcu_preempt19-21ksoftirqd/110:33:181
81640,0rcu_preempt19-21ksoftirqd/108:22:121
81630,0rcu_preempt19-21ksoftirqd/110:52:201
81620,0rcu_preempt3444-21apt-get08:37:110
81620,0rcu_preempt19-21ksoftirqd/110:02:441
81620,0rcu_preempt19-21ksoftirqd/109:55:361
81620,0rcu_preempt19-21ksoftirqd/109:42:181
81620,0rcu_preempt19-21ksoftirqd/109:41:501
81610,0rcu_preempt3-21ksoftirqd/012:34:240
81610,0rcu_preempt19-21ksoftirqd/112:02:261
81610,0rcu_preempt19-21ksoftirqd/107:17:131
10050610,0irq/346-484840029692-1kworker/1:0H10:45:211
10050610,0irq/346-484840018824-1kworker/1:2H12:31:451
10050600,0irq/346-484840011667-1kworker/1:2H11:50:591
81590,0rcu_preempt19-21ksoftirqd/111:15:421
81590,0rcu_preempt19-21ksoftirqd/110:47:531
81590,0rcu_preempt19-21ksoftirqd/110:25:391
81590,0rcu_preempt19-21ksoftirqd/107:48:221
615399592,0cyclictest0-21swapper/007:27:260
81580,0rcu_preempt54-21kswapd007:22:080
81580,0rcu_preempt19-21ksoftirqd/108:40:241
81580,0rcu_preempt19-21ksoftirqd/108:20:301
81580,0rcu_preempt19-21ksoftirqd/108:20:301
10050570,0irq/346-484840016639-1kworker/1:1H12:11:511
81560,0rcu_preempt3-21ksoftirqd/008:57:150
10050560,0irq/346-4848400851-21rngd09:32:061
81550,0rcu_preempt3-21ksoftirqd/010:42:180
81550,0rcu_preempt3-21ksoftirqd/008:42:160
81550,0rcu_preempt3-21ksoftirqd/008:17:110
81550,0rcu_preempt3-21ksoftirqd/008:17:110
81550,0rcu_preempt19-21ksoftirqd/110:57:251
10050550,0irq/346-484840054-21kswapd011:03:291
10050550,0irq/346-484840054-21kswapd009:17:191
81540,0rcu_preempt54-21kswapd007:46:071
81540,0rcu_preempt3-21ksoftirqd/012:27:280
81540,0rcu_preempt3-21ksoftirqd/010:02:300
10050540,0irq/346-484840054-21kswapd011:09:250
10050540,0irq/346-484840054-21kswapd011:01:500
10050540,0irq/346-48484003053-21ssh11:07:291
10050540,0irq/346-484840019781-1kworker/1:0H10:20:511
81530,0rcu_preempt3-21ksoftirqd/012:17:230
81530,0rcu_preempt3-21ksoftirqd/011:52:250
81530,0rcu_preempt3-21ksoftirqd/009:22:230
81530,0rcu_preempt19-21ksoftirqd/108:02:151
10050530,0irq/346-48484009415-1kworker/0:2H11:38:430
10050530,0irq/346-484840015532-1kworker/1:0H09:12:401
81520,0rcu_preempt353-21php-cgi08:27:190
81520,0rcu_preempt3-21ksoftirqd/011:17:200
81520,0rcu_preempt3-21ksoftirqd/011:12:110
81520,0rcu_preempt3-21ksoftirqd/009:21:160
81520,0rcu_preempt3-21ksoftirqd/008:12:260
81520,0rcu_preempt26140-21kworker/0:107:52:160
10050520,0irq/346-484840054-21kswapd010:16:371
10050520,0irq/346-484840021609-1kworker/1:2H11:59:561
81510,0rcu_preempt54-21kswapd009:45:370
81510,0rcu_preempt3-21ksoftirqd/011:27:250
81510,0rcu_preempt3-21ksoftirqd/010:27:190
81510,0rcu_preempt3-21ksoftirqd/009:32:240
81510,0rcu_preempt3-21ksoftirqd/008:52:210
81510,0rcu_preempt3-21ksoftirqd/007:47:210
81510,0rcu_preempt3-21ksoftirqd/007:12:200
81510,0rcu_preempt22214-21ping08:10:050
81510,0rcu_preempt12999-21kworker/0:112:11:550
81500,0rcu_preempt54-21kswapd009:59:410
81500,0rcu_preempt3-21ksoftirqd/011:45:570
81500,0rcu_preempt3-21ksoftirqd/010:17:550
10050500,0irq/346-484840054-21kswapd010:52:030
10050500,0irq/346-484840054-21kswapd010:07:390
10050500,0irq/346-484840023778-1kworker/1:0H12:35:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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