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2026-01-11 - 17:51

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 highest latencies:
System rackaslot5s.osadl.org (updated Sun Jan 11, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811000,0rcu_preempt54-21kswapd012:20:061
81910,0rcu_preempt3-21ksoftirqd/011:55:230
81900,0rcu_preempt3-21ksoftirqd/007:26:330
81850,0rcu_preempt3-21ksoftirqd/009:15:200
81820,0rcu_preempt19-21ksoftirqd/107:19:591
81740,0rcu_preempt3-21ksoftirqd/011:10:230
81710,0rcu_preempt20434-21ntpq12:20:200
81700,0rcu_preempt3-21ksoftirqd/010:30:160
81700,0rcu_preempt3-21ksoftirqd/008:35:180
81700,0rcu_preempt20072-21if_can010:40:160
81680,0rcu_preempt3-21ksoftirqd/007:50:170
81680,0rcu_preempt3-21ksoftirqd/007:50:170
81680,0rcu_preempt32052-21kworker/0:109:46:260
81670,0rcu_preempt3-21ksoftirqd/010:04:260
81670,0rcu_preempt3-21ksoftirqd/008:10:230
2098399661,0cyclictest17692-1kworker/0:2H09:39:110
81650,0rcu_preempt3-21ksoftirqd/011:26:490
2098399655,0cyclictest0-21swapper/010:55:090
2098399652,0cyclictest6519-21ssh09:20:210
2098399652,0cyclictest0-21swapper/011:00:110
2098399651,0cyclictest5244-21munin-node0
81630,0rcu_preempt19-21ksoftirqd/107:05:241
81630,0rcu_preempt18802-21ssh10:39:100
2098399632,0cyclictest0-21swapper/012:30:580
13402630,0chrt10050irq/346-484840007:45:570
81620,0rcu_preempt26827-1kworker/0:3H10:49:580
2098399622,0cyclictest0-21swapper/011:40:290
2098399621,0cyclictest30878-1kworker/0:0H12:00:140
81610,0rcu_preempt19-21ksoftirqd/109:15:101
2098399618,0cyclictest24136-21ssh11:17:000
2098399618,0cyclictest0-21swapper/010:10:260
2098399612,0cyclictest3401-1kworker/0:1H12:05:190
2098399612,0cyclictest19066-21idleruntime11:45:150
2098399612,0cyclictest13858-21ssh09:27:580
20983996113,0cyclictest24339-21munin-node0
2098399611,0cyclictest11596-21latency_hist08:19:590
10050610,0irq/346-484840027495-1kworker/0:4H09:43:000
2098399606,0cyclictest0-21swapper/011:05:220
2098399603,0cyclictest0-21swapper/011:20:080
20983996010,0cyclictest0-21swapper/007:20:320
10050600,0irq/346-484840054-21kswapd012:26:421
10050600,0irq/346-484840054-21kswapd012:16:151
10050600,0irq/346-484840054-21kswapd012:07:261
10050600,0irq/346-484840054-21kswapd011:46:491
2098399596,0cyclictest0-21swapper/010:09:050
2098399592,0cyclictest189522chrt12:19:220
2098399592,0cyclictest11972-21ssh09:59:210
2098399592,0cyclictest11972-21ssh09:59:210
2098399591,0cyclictest4760-21ssh11:30:200
10050590,0irq/346-484840054-21kswapd011:56:541
10050590,0irq/346-484840024673-1kworker/0:3H10:15:590
81580,0rcu_preempt3-21ksoftirqd/008:30:210
2098399587,0cyclictest30415-21runrttasks09:11:330
2098399582,0cyclictest280342sleep012:28:230
2098399582,0cyclictest23858-21munin-node0
2098399582,0cyclictest11753-21munin-node0
2098399582,0cyclictest0-21swapper/009:54:090
2098399581,0cyclictest0-21swapper/009:33:140
2098399581,0cyclictest0-21swapper/009:33:140
10050580,0irq/346-484840054-21kswapd011:09:111
81570,0rcu_preempt3-21ksoftirqd/007:55:200
2098399572,0cyclictest0-21swapper/008:40:260
2098399571,0cyclictest24277-21ping07:20:000
2098399562,0cyclictest21357-21fschecks_count07:10:150
20983995614,0cyclictest0-21swapper/008:22:160
2098399561,0cyclictest3574-21runrttasks12:35:520
2098399561,0cyclictest0-21swapper/010:20:090
10050560,0irq/346-484840025951-1kworker/1:3H11:54:231
10050560,0irq/346-484840011219-1kworker/1:1H11:37:491
2098399552,0cyclictest26286-21runrttasks09:03:340
2098399552,0cyclictest0-21swapper/011:37:050
2098399551,0cyclictest26889-21if_can009:05:160
2098399542,0cyclictest7033-21ssh08:05:150
2098399542,0cyclictest29576-21ssh10:50:100
2098399542,0cyclictest20708-21ps08:45:230
20983995413,0cyclictest1465-1kworker/0:3H08:00:110
2098399541,0cyclictest29819-21if_eth307:35:230
2098399541,0cyclictest29819-21if_eth307:35:230
10050540,0irq/346-484840054-21kswapd012:13:201
10050540,0irq/346-484840054-21kswapd011:17:491
10050540,0irq/346-484840028051-21ssh09:42:171
10050540,0irq/346-484840012758-1kworker/1:1H09:29:361
81530,0rcu_preempt3-21ksoftirqd/008:25:170
20983995312,0cyclictest31005-21runrttasks07:40:070
81520,0rcu_preempt19-21ksoftirqd/107:21:321
2098399521,0cyclictest24277-21ping07:30:100
10050520,0irq/346-48484003398-21ssh10:55:331
10050520,0irq/346-484840030425-21ssh11:23:501
10050520,0irq/346-484840026982-1kworker/1:0H12:31:521
10050510,0irq/346-48484004256-21ssh09:50:391
10050510,0irq/346-484840017888-21ssh11:10:301
2098399501,0cyclictest16282-1kworker/0:1H08:50:200
10050500,0irq/346-48484007684-21ssh10:27:291
10050500,0irq/346-484840054-21kswapd011:44:401
10050500,0irq/346-484840054-21kswapd010:15:171
10050500,0irq/346-484840030678-21ssh09:11:531
10050500,0irq/346-484840022128-21ssh09:35:541
10050500,0irq/346-484840020241-21ssh10:07:171
10050500,0irq/346-484840010208-21ssh09:57:011
10050500,0irq/346-484840010208-21ssh09:57:011
81490,0rcu_preempt30362-21apt-get09:45:101
10050490,0irq/346-48484008142-21ssh11:34:141
10050490,0irq/346-484840031952-21ssh10:52:001
10050490,0irq/346-484840021028-21ssh10:40:351
10050490,0irq/346-484840018987-21ssh09:33:151
10050490,0irq/346-484840018987-21ssh09:33:151
81480,0rcu_preempt19-21ksoftirqd/108:09:591
10050480,0irq/346-48484007552-21ssh09:21:071
10050480,0irq/346-484840054-21kswapd011:25:421
10050480,0irq/346-484840054-21kswapd010:11:221
10050480,0irq/346-48484004287-1kworker/1:1H11:00:501
10050480,0irq/346-484840026180-21ssh10:45:531
10050470,0irq/346-484840017611-21ssh10:37:361
10050470,0irq/346-484840014816-1kworker/1:3H10:01:571
10050470,0irq/346-48484001043-21ssh12:00:101
81460,0rcu_preempt7244-21kworker/1:008:15:321
10050460,0irq/346-484840012998-1kworker/1:1H08:40:021
81450,0rcu_preempt28069-21diskmemload10:20:451
81440,0rcu_preempt19-21ksoftirqd/108:00:281
10050440,0irq/346-484840031917-1kworker/1:2H12:36:511
81430,0rcu_preempt19-21ksoftirqd/107:25:221
10050430,0irq/346-484840024277-21ping07:45:181
10050430,0irq/346-48484000-21swapper/109:00:051
81420,0rcu_preempt3-21ksoftirqd/007:05:200
81420,0rcu_preempt24277-21ping07:40:271
81420,0rcu_preempt19-21ksoftirqd/110:30:191
81410,0rcu_preempt19-21ksoftirqd/108:10:061
81410,0rcu_preempt19-21ksoftirqd/107:34:581
81410,0rcu_preempt11765-21apt-get08:20:081
10050400,0irq/346-484840027148-1kworker/1:1H09:06:271
9950390,0irq/345-484840019-21ksoftirqd/107:59:591
81390,0rcu_preempt22652-21date07:14:591
81380,0rcu_preempt19-21ksoftirqd/108:59:591
9950370,0irq/345-4848400152572chrt08:30:141
81370,0rcu_preempt19-21ksoftirqd/108:29:591
81370,0rcu_preempt1470-21runrttasks07:35:161
81370,0rcu_preempt1470-21runrttasks07:35:161
81360,0rcu_preempt19-21ksoftirqd/108:49:591
81360,0rcu_preempt19-21ksoftirqd/108:45:161
81360,0rcu_preempt19-21ksoftirqd/108:39:581
81360,0rcu_preempt19-21ksoftirqd/107:50:261
81360,0rcu_preempt19-21ksoftirqd/107:50:261
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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