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2026-07-20 - 16:57

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 Mon Jul 20, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811010,0rcu_preempt0-21swapper/009:55:030
811000,0rcu_preempt3-21ksoftirqd/009:58:430
811000,0rcu_preempt3-21ksoftirqd/009:58:430
81970,0rcu_preempt3-21ksoftirqd/011:13:060
81960,0rcu_preempt3-21ksoftirqd/010:22:230
81780,0rcu_preempt3-21ksoftirqd/011:43:270
81740,0rcu_preempt3-21ksoftirqd/008:17:290
81730,0rcu_preempt54-21kswapd012:06:080
81720,0rcu_preempt3-21ksoftirqd/010:48:540
81710,0rcu_preempt3-21ksoftirqd/007:56:580
10050710,0irq/346-484840024850-1kworker/1:1H11:47:481
81700,0rcu_preempt3-21ksoftirqd/012:32:250
81700,0rcu_preempt31253-21diskmemload10:02:220
81690,0rcu_preempt3-21ksoftirqd/011:56:540
81690,0rcu_preempt3-21ksoftirqd/009:48:460
81680,0rcu_preempt3-21ksoftirqd/009:30:060
81680,0rcu_preempt3-21ksoftirqd/008:42:100
2427799678,0cyclictest851-21rngd11:35:460
2427799678,0cyclictest851-21rngd11:35:460
2427799674,0cyclictest31253-21diskmemload11:03:140
2427799672,0cyclictest16712-21rm12:07:490
81660,0rcu_preempt5687-21ssh11:57:160
81660,0rcu_preempt3-21ksoftirqd/010:37:110
81660,0rcu_preempt19-21ksoftirqd/110:16:541
81650,0rcu_preempt3-21ksoftirqd/011:26:250
81650,0rcu_preempt3-21ksoftirqd/011:26:250
81640,0rcu_preempt8042-21ping08:12:291
2427799642,0cyclictest0-21swapper/012:16:590
10050640,0irq/346-4848400111rcuc/009:07:040
81630,0rcu_preempt2476-21ssh09:42:260
81630,0rcu_preempt19-21ksoftirqd/111:40:551
2427799631,0cyclictest1620-1kworker/0:2H09:14:060
10050630,0irq/346-484840027197-1kworker/1:2H12:19:201
81620,0rcu_preempt8042-21ping08:02:210
81620,0rcu_preempt26269-21diskstats07:12:150
2427799622,0cyclictest32157-21ssh11:17:550
2427799621,0cyclictest27556-21ping07:37:100
2427799621,0cyclictest1215-1kworker/0:1H10:19:010
2427799621,0cyclictest1215-1kworker/0:1H10:19:010
10050620,0irq/346-48484001470-21runrttasks09:50:291
2427799613,0cyclictest0-21swapper/009:17:560
2427799612,0cyclictest26287-21ssh10:07:100
2427799612,0cyclictest13929-21apt-get09:22:080
2427799612,0cyclictest0-21swapper/010:52:170
2427799611,0cyclictest4645-1kworker/0:0H12:29:100
2427799611,0cyclictest28023-21df_inode11:47:130
2427799611,0cyclictest22229-1kworker/0:3H12:14:520
10050610,0irq/346-484840054-21kswapd010:43:541
81600,0rcu_preempt3-21ksoftirqd/010:27:070
81600,0rcu_preempt3-21ksoftirqd/008:22:250
81600,0rcu_preempt21770-21diskstats08:37:130
2427799606,0cyclictest9974-1kworker/0:3H11:30:500
2427799601,0cyclictest27198-1kworker/0:0H12:22:210
10050600,0irq/346-484840032518-1kworker/1:0H11:18:451
10050600,0irq/346-484840030880-1kworker/1:0H09:08:471
81590,0rcu_preempt3-21ksoftirqd/007:47:130
2427799592,0cyclictest0-21swapper/009:38:230
24277995916,0cyclictest26606-21ssh09:34:300
2427799591,0cyclictest0-21swapper/011:06:580
10050590,0irq/346-484840054-21kswapd009:29:251
10050590,0irq/346-484840027926-1kworker/1:1H10:09:311
10050590,0irq/346-484840026047-1kworker/1:2H10:41:381
10050590,0irq/346-484840021110-1kworker/1:0H10:53:071
81580,0rcu_preempt19-21ksoftirqd/111:42:121
81580,0rcu_preempt19-21ksoftirqd/111:10:321
81580,0rcu_preempt19-21ksoftirqd/109:21:101
2427799582,0cyclictest19843-21sed08:31:570
2427799582,0cyclictest19317-21ssh11:37:420
2427799582,0cyclictest18703-21diskstats10:32:130
2427799582,0cyclictest0-21swapper/010:43:270
10050580,0irq/346-484840054-21kswapd011:00:571
10050580,0irq/346-484840054-21kswapd009:23:331
10050580,0irq/346-48484004646-1kworker/1:1H12:30:271
10050580,0irq/346-484840012298-1kworker/1:1H12:08:361
10050580,0irq/346-484840011161-1kworker/1:2H10:28:161
81570,0rcu_preempt6767-21apt-get07:52:080
2427799572,0cyclictest0-21swapper/010:58:540
2427799572,0cyclictest0-21swapper/010:12:190
10050570,0irq/346-484840022228-1kworker/1:0H12:16:241
2427799562,0cyclictest27963-21munin-run08:56:570
2427799562,0cyclictest27556-21ping07:22:070
2427799562,0cyclictest24831-21munin-node0
2427799561,0cyclictest32477-21latency_hist07:31:580
10050560,0irq/346-484840030527-1kworker/1:2H09:38:551
10050560,0irq/346-48484002348-1kworker/1:1H11:55:431
10050560,0irq/346-484840018764-1kworker/1:0H10:02:391
10050560,0irq/346-484840014917-1kworker/1:2H11:35:561
10050560,0irq/346-484840014917-1kworker/1:2H11:35:561
81550,0rcu_preempt19-21ksoftirqd/110:48:461
81550,0rcu_preempt19-21ksoftirqd/109:32:191
2427799552,0cyclictest0-21swapper/008:13:220
2427799552,0cyclictest0-21swapper/007:32:560
81540,0rcu_preempt19-21ksoftirqd/107:39:101
2427799542,0cyclictest27556-21ping07:17:090
10050540,0irq/346-48484006210-1kworker/1:0H10:19:171
10050540,0irq/346-48484006210-1kworker/1:0H10:19:171
10050540,0irq/346-484840021110-1kworker/1:0H10:36:211
81530,0rcu_preempt3-21ksoftirqd/007:02:180
2427799532,0cyclictest27556-21ping07:42:100
2427799532,0cyclictest0-21swapper/009:02:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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