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2026-05-15 - 18:30

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 Fri May 15, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81970,0rcu_preempt3-21ksoftirqd/011:56:220
81960,0rcu_preempt19-21ksoftirqd/107:38:281
81960,0rcu_preempt19-21ksoftirqd/107:38:281
81930,0rcu_preempt3-21ksoftirqd/010:54:180
81860,0rcu_preempt19-21ksoftirqd/112:08:231
81850,0rcu_preempt19-21ksoftirqd/111:44:451
10050820,0irq/346-4848400111rcuc/012:29:240
10050790,0irq/346-4848400111rcuc/009:51:580
10050780,0irq/346-4848400111rcuc/010:22:070
4462997711,0cyclictest11925-1kworker/0:2H12:24:540
10050760,0irq/346-4848400111rcuc/011:20:060
81740,0rcu_preempt19-21ksoftirqd/112:21:201
81740,0rcu_preempt19-21ksoftirqd/112:16:381
81740,0rcu_preempt19-21ksoftirqd/112:16:381
81740,0rcu_preempt19-21ksoftirqd/111:33:191
81740,0rcu_preempt19-21ksoftirqd/111:28:301
81740,0rcu_preempt19-21ksoftirqd/107:28:341
10050740,0irq/346-4848400111rcuc/012:06:120
81730,0rcu_preempt3-21ksoftirqd/010:38:440
81730,0rcu_preempt19-21ksoftirqd/110:52:391
81720,0rcu_preempt3-21ksoftirqd/009:30:230
81720,0rcu_preempt3-21ksoftirqd/009:30:230
81710,0rcu_preempt19-21ksoftirqd/109:43:201
81700,0rcu_preempt19-21ksoftirqd/109:15:501
10050700,0irq/346-484840041ktimersoftd/011:07:520
81690,0rcu_preempt3-21ksoftirqd/009:21:550
81690,0rcu_preempt19-21ksoftirqd/110:07:461
81690,0rcu_preempt11450-21diskmemload09:43:250
446299692,0cyclictest0-21swapper/009:23:160
81670,0rcu_preempt29878-21kworker/1:009:54:221
81670,0rcu_preempt19-21ksoftirqd/110:32:141
81660,0rcu_preempt19-21ksoftirqd/111:27:491
446299661,0cyclictest0-21swapper/009:58:200
446299661,0cyclictest0-21swapper/009:58:200
81650,0rcu_preempt3-21ksoftirqd/011:48:070
446299651,0cyclictest3892-1kworker/0:0H10:08:130
81640,0rcu_preempt19-21ksoftirqd/109:23:261
446299641,0cyclictest0-21swapper/010:52:150
10050630,0irq/346-4848400360-1kworker/1:1H10:41:121
81620,0rcu_preempt19-21ksoftirqd/110:33:051
446299622,0cyclictest28721-21ssh10:30:400
10050620,0irq/346-484840014717-1kworker/1:3H11:59:241
81610,0rcu_preempt3-21ksoftirqd/011:33:450
10050610,0irq/346-48484006634-1kworker/1:2H09:39:381
10050610,0irq/346-484840024573-1kworker/1:2H12:07:391
10050610,0irq/346-484840011924-1kworker/1:3H12:29:061
81600,0rcu_preempt3-21ksoftirqd/011:08:120
81600,0rcu_preempt3-21ksoftirqd/007:53:120
81600,0rcu_preempt22825-21kworker/0:007:08:120
446299602,0cyclictest0-21swapper/010:36:510
446299602,0cyclictest0-21swapper/009:17:030
4462996013,0cyclictest24856-21taskset10:27:060
10050600,0irq/346-484840030598-1kworker/1:2H09:59:591
10050600,0irq/346-484840030598-1kworker/1:2H09:59:591
10050600,0irq/346-48484002678-1kworker/1:0H11:12:581
446299592,0cyclictest7744-21ping07:43:140
446299592,0cyclictest3602-21ssh12:16:570
446299592,0cyclictest3602-21ssh12:16:570
446299592,0cyclictest0-21swapper/010:16:550
10050590,0irq/346-484840054-21kswapd011:22:241
10050590,0irq/346-484840022510-1kworker/1:3H11:39:091
10050590,0irq/346-484840016515-1kworker/1:2H09:48:571
10050590,0irq/346-484840011924-1kworker/1:3H12:33:411
81580,0rcu_preempt4518-1kworker/1:0H08:48:201
446299582,0cyclictest3477-21ntpq11:43:260
446299582,0cyclictest0-21swapper/009:55:240
4462995815,0cyclictest10050irq/346-484840012:19:290
10050580,0irq/346-4848400927-1kworker/1:0H10:13:041
10050580,0irq/346-484840014717-1kworker/1:3H11:56:031
81570,0rcu_preempt19-21ksoftirqd/111:05:281
446299573,0cyclictest0-21swapper/012:34:410
446299573,0cyclictest0-21swapper/010:05:190
446299573,0cyclictest0-21swapper/008:16:460
446299573,0cyclictest0-21swapper/008:16:460
446299572,0cyclictest5520-21munin-node0
446299572,0cyclictest0-21swapper/011:58:590
4462995712,0cyclictest31428-21seq08:28:230
4462995712,0cyclictest30962-21ntpq11:38:260
4462995712,0cyclictest0-21swapper/011:29:590
10050570,0irq/346-484840028451-1kworker/1:1H09:28:501
10050570,0irq/346-484840028451-1kworker/1:1H09:28:501
81560,0rcu_preempt3-21ksoftirqd/008:48:180
81560,0rcu_preempt19-21ksoftirqd/108:13:311
81560,0rcu_preempt19-21ksoftirqd/108:13:311
446299569,0cyclictest10050irq/346-484840012:08:520
446299561,0cyclictest0-21swapper/011:24:240
10050560,0irq/346-4848400927-1kworker/1:0H10:08:491
10050560,0irq/346-48484006972-1kworker/1:2H12:23:301
10050560,0irq/346-484840023507-1kworker/1:0H09:20:551
81550,0rcu_preempt20623-21ping07:58:160
446299558,0cyclictest1237450kworker/0:2H07:33:230
446299553,0cyclictest0-21swapper/008:08:190
446299552,0cyclictest9950irq/345-484840010:58:120
446299552,0cyclictest7744-21ping07:23:140
446299552,0cyclictest0-21swapper/009:40:020
446299552,0cyclictest0-21swapper/008:18:180
446299551,0cyclictest4132-21cpu09:33:140
81540,0rcu_preempt20623-21ping07:58:311
446299542,0cyclictest12746-21ls09:08:280
446299542,0cyclictest0-21swapper/010:43:070
10050540,0irq/346-4848400927-1kworker/1:0H10:18:561
81530,0rcu_preempt7744-21ping07:18:381
81530,0rcu_preempt3-21ksoftirqd/008:33:130
81530,0rcu_preempt19-21ksoftirqd/108:03:191
446299533,0cyclictest0-21swapper/008:23:570
446299533,0cyclictest0-21swapper/008:23:570
446299532,0cyclictest0-21swapper/007:18:280
10050530,0irq/346-484840022930-1kworker/1:3H10:25:581
446299522,0cyclictest7744-21ping07:38:300
446299522,0cyclictest7744-21ping07:38:300
446299521,0cyclictest7744-21ping07:28:140
446299521,0cyclictest20623-21ping08:04:370
446299521,0cyclictest0-21swapper/009:03:280
10050520,0irq/346-48484009455-21ssh10:43:301
10050520,0irq/346-484840054-21kswapd010:54:261
10050520,0irq/346-484840028451-1kworker/1:1H09:33:031
10050520,0irq/346-484840011092-1kworker/1:2H09:08:271
81490,0rcu_preempt3-21ksoftirqd/007:13:240
81490,0rcu_preempt19-21ksoftirqd/108:18:301
10050490,0irq/346-48484006662-21ssh11:13:311
10050490,0irq/346-48484004865-1kworker/1:0H11:48:081
81480,0rcu_preempt3-21ksoftirqd/008:43:170
81480,0rcu_preempt19-21ksoftirqd/111:00:261
81480,0rcu_preempt19-21ksoftirqd/107:51:101
81470,0rcu_preempt3-21ksoftirqd/008:58:190
81470,0rcu_preempt3-21ksoftirqd/008:58:190
81470,0rcu_preempt3-21ksoftirqd/008:53:190
81470,0rcu_preempt3-21ksoftirqd/007:48:170
81470,0rcu_preempt3-21ksoftirqd/007:03:190
81470,0rcu_preempt19-21ksoftirqd/109:03:191
81470,0rcu_preempt1747-21apt-get08:38:120
81460,0rcu_preempt19-21ksoftirqd/108:12:311
81460,0rcu_preempt19-21ksoftirqd/107:08:111
81450,0rcu_preempt19-21ksoftirqd/107:53:241
81440,0rcu_preempt20623-21ping08:23:261
81440,0rcu_preempt20623-21ping08:23:261
81440,0rcu_preempt19-21ksoftirqd/108:53:141
81440,0rcu_preempt19-21ksoftirqd/108:33:171
81440,0rcu_preempt19-21ksoftirqd/107:13:191
81430,0rcu_preempt19-21ksoftirqd/107:23:331
81420,0rcu_preempt19-21ksoftirqd/107:43:271
81400,0rcu_preempt2509-1kworker/1:1H07:05:221
81400,0rcu_preempt19-21ksoftirqd/108:58:211
81400,0rcu_preempt19-21ksoftirqd/108:58:211
81400,0rcu_preempt19-21ksoftirqd/107:33:381
81390,0rcu_preempt19-21ksoftirqd/108:43:111
81380,0rcu_preempt19-21ksoftirqd/108:28:211
81360,0rcu_preempt19-21ksoftirqd/108:42:441
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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