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2026-03-24 - 16:38

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 24, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10050860,0irq/346-4848400111rcuc/010:15:560
10050820,0irq/346-4848400111rcuc/011:32:480
10050820,0irq/346-4848400111rcuc/010:44:100
10050810,0irq/346-4848400111rcuc/012:31:560
10050790,0irq/346-484840041ktimersoftd/009:38:270
10050790,0irq/346-4848400111rcuc/011:59:050
10050780,0irq/346-4848400111rcuc/011:07:350
10050780,0irq/346-4848400111rcuc/011:07:350
81760,0rcu_preempt3-21ksoftirqd/010:11:570
1518899767,0cyclictest0-21swapper/010:36:520
10050760,0irq/346-4848400111rcuc/009:53:170
81730,0rcu_preempt3-21ksoftirqd/009:48:310
1518899736,0cyclictest13412-1kworker/0:3H12:21:430
81720,0rcu_preempt3-21ksoftirqd/009:20:560
81680,0rcu_preempt19-21ksoftirqd/110:15:311
81670,0rcu_preempt3-21ksoftirqd/012:24:040
81660,0rcu_preempt3-21ksoftirqd/007:14:160
81660,0rcu_preempt19-21ksoftirqd/112:09:091
1518899655,0cyclictest0-21swapper/012:12:450
10050650,0irq/346-484840054-21kswapd009:16:220
81640,0rcu_preempt19-21ksoftirqd/112:23:141
81640,0rcu_preempt19-21ksoftirqd/109:45:031
81640,0rcu_preempt19-21ksoftirqd/109:24:181
1518899636,0cyclictest0-21swapper/009:30:050
1518899632,0cyclictest0-21swapper/011:28:510
81620,0rcu_preempt851-21rngd09:29:081
81620,0rcu_preempt19-21ksoftirqd/112:33:571
1518899622,0cyclictest0-21swapper/011:51:120
1518899622,0cyclictest0-21swapper/011:45:240
10050620,0irq/346-484840018962-1kworker/1:2H12:26:341
81610,0rcu_preempt3-21ksoftirqd/011:19:400
81610,0rcu_preempt3-21ksoftirqd/010:39:080
81610,0rcu_preempt3-21ksoftirqd/007:09:130
81610,0rcu_preempt3-21ksoftirqd/007:09:130
81610,0rcu_preempt19-21ksoftirqd/111:45:591
81610,0rcu_preempt19-21ksoftirqd/111:22:541
81610,0rcu_preempt19-21ksoftirqd/110:44:041
1518899612,0cyclictest0-21swapper/011:55:520
15188996112,0cyclictest9696-21ssh11:43:080
15188996112,0cyclictest9696-21ssh11:43:080
10050610,0irq/346-4848400473-1kworker/1:0H10:25:481
10050610,0irq/346-48484003890-1kworker/1:2H09:57:391
10050610,0irq/346-484840011597-1kworker/1:1H11:14:001
81600,0rcu_preempt19-21ksoftirqd/110:53:111
1518899607,0cyclictest11580-21cpu10:04:040
1518899603,0cyclictest10050irq/346-484840012:17:050
1518899602,0cyclictest0-21swapper/010:19:210
1518899601,0cyclictest26032chrt11:01:490
1518899601,0cyclictest0-21swapper/010:54:240
10050600,0irq/346-484840054-21kswapd010:28:510
10050600,0irq/346-484840013572-1kworker/1:2H10:08:321
81590,0rcu_preempt22181-21diskmemload12:34:020
1518899592,0cyclictest0-21swapper/011:38:150
1518899592,0cyclictest0-21swapper/009:11:490
1518899591,0cyclictest0-21swapper/010:51:340
81580,0rcu_preempt19-21ksoftirqd/111:28:181
81580,0rcu_preempt19-21ksoftirqd/111:03:381
1518899585,0cyclictest3207050kworker/0:1H12:06:140
1518899583,0cyclictest1676950kworker/0:3H09:39:380
1518899582,0cyclictest18469-21ping07:39:020
1518899582,0cyclictest0-21swapper/007:24:190
10050580,0irq/346-48484003282-1kworker/1:2H11:40:391
10050580,0irq/346-48484003282-1kworker/1:2H11:40:391
81570,0rcu_preempt7380-21ssh10:33:321
1518899576,0cyclictest1645-21munin-node0
1518899572,0cyclictest22185-21munin-node0
1518899572,0cyclictest18890-21awk08:58:510
1518899572,0cyclictest0-21swapper/008:49:080
1518899571,0cyclictest18469-21ping07:44:030
10050570,0irq/346-48484008769-1kworker/1:0H10:02:141
10050570,0irq/346-484840054-21kswapd011:59:301
10050570,0irq/346-484840054-21kswapd011:15:180
10050570,0irq/346-484840029481-1kworker/1:2H11:10:271
10050570,0irq/346-4848400116522chrt11:10:580
81560,0rcu_preempt19-21ksoftirqd/110:54:391
1518899562,0cyclictest24817-21runrttasks07:36:550
1518899562,0cyclictest0-21swapper/010:29:190
1518899562,0cyclictest0-21swapper/008:14:060
15188995614,0cyclictest10334-1kworker/0:2H08:34:140
15188995613,0cyclictest0-21swapper/010:01:020
15188995610,0cyclictest1470-21runrttasks09:24:550
10050560,0irq/346-484840030902-1kworker/1:0H11:33:011
10050560,0irq/346-484840029481-1kworker/1:2H11:04:071
10050560,0irq/346-484840029481-1kworker/1:2H11:04:071
81550,0rcu_preempt3-21ksoftirqd/007:54:110
81550,0rcu_preempt19-21ksoftirqd/111:54:101
81550,0rcu_preempt19-21ksoftirqd/109:37:171
1518899552,0cyclictest18469-21ping07:19:030
1518899552,0cyclictest1675-21runrttasks08:04:180
10050550,0irq/346-484840024625-1kworker/1:3H09:10:381
81540,0rcu_preempt19-21ksoftirqd/108:24:041
81540,0rcu_preempt0-21swapper/110:20:141
1518899542,0cyclictest0-21swapper/009:04:110
10050540,0irq/346-484840054-21kswapd010:42:531
10050540,0irq/346-48484003282-1kworker/1:2H11:37:291
10050540,0irq/346-484840023788-1kworker/1:0H12:33:501
10050540,0irq/346-484840015186-21cyclictest09:43:071
81530,0rcu_preempt19-21ksoftirqd/108:14:041
1518899533,0cyclictest0-21swapper/009:00:080
1518899532,0cyclictest0-21swapper/008:29:110
1518899532,0cyclictest0-21swapper/008:19:110
1518899531,0cyclictest14320-21munin-node0
10050530,0irq/346-484840054-21kswapd009:17:291
10050530,0irq/346-48484004468-1kworker/1:1H12:15:261
1518899523,0cyclictest0-21swapper/008:09:150
1518899522,0cyclictest11976-1kworker/0:3H08:39:040
1518899522,0cyclictest0-21swapper/008:24:170
1518899521,0cyclictest29564-21runrttasks07:50:020
10050520,0irq/346-4848400473-1kworker/1:0H10:34:121
10050520,0irq/346-484840017640-21ssh10:09:411
15188995110,0cyclictest0-21swapper/007:59:560
10050510,0irq/346-484840026487-1kworker/1:3H09:49:391
81490,0rcu_preempt13678-21apt-get07:04:020
10050470,0irq/346-4848400851-21rngd12:03:571
81460,0rcu_preempt19-21ksoftirqd/108:19:121
81460,0rcu_preempt19-21ksoftirqd/108:04:191
81460,0rcu_preempt19-21ksoftirqd/107:59:221
81460,0rcu_preempt19-21ksoftirqd/107:58:121
10050460,0irq/346-48484002033-1kworker/1:2H09:23:481
10050460,0irq/346-484840018469-21ping07:19:141
81450,0rcu_preempt19-21ksoftirqd/108:59:021
81450,0rcu_preempt19-21ksoftirqd/108:39:081
81450,0rcu_preempt19-21ksoftirqd/108:13:501
81450,0rcu_preempt19-21ksoftirqd/107:44:011
10050450,0irq/346-484840012899-1kworker/1:2H11:49:491
81440,0rcu_preempt19-21ksoftirqd/107:29:221
81430,0rcu_preempt19-21ksoftirqd/107:39:111
10050430,0irq/346-484840015282-1kworker/1:0H08:48:501
81410,0rcu_preempt54-21kswapd007:17:131
81410,0rcu_preempt19-21ksoftirqd/108:49:091
81410,0rcu_preempt19-21ksoftirqd/107:24:281
81400,0rcu_preempt19-21ksoftirqd/109:06:161
81400,0rcu_preempt19-21ksoftirqd/108:54:021
81400,0rcu_preempt19-21ksoftirqd/108:34:071
81400,0rcu_preempt19-21ksoftirqd/107:52:581
81400,0rcu_preempt19-21ksoftirqd/107:13:311
81400,0rcu_preempt19-21ksoftirqd/107:13:311
81400,0rcu_preempt19-21ksoftirqd/107:04:411
81390,0rcu_preempt23528-21apt-get07:34:021
81370,0rcu_preempt0-21swapper/108:28:531
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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