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2026-03-13 - 16:14

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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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 Mar 13, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811000,0rcu_preempt31087-21ping08:19:211
81950,0rcu_preempt54-21kswapd010:49:271
81930,0rcu_preempt17794-21kworker/1:109:35:291
81900,0rcu_preempt19-21ksoftirqd/111:32:421
81890,0rcu_preempt0-21swapper/112:30:161
81880,0rcu_preempt54-21kswapd010:46:401
81870,0rcu_preempt19-21ksoftirqd/112:28:431
81860,0rcu_preempt19-21ksoftirqd/109:47:521
10050850,0irq/346-484840054-21kswapd009:09:110
81840,0rcu_preempt19-21ksoftirqd/110:29:521
81830,0rcu_preempt0-21swapper/110:18:391
81820,0rcu_preempt19-21ksoftirqd/110:36:211
81810,0rcu_preempt19-21ksoftirqd/110:41:491
81790,0rcu_preempt19-21ksoftirqd/110:09:311
10050750,0irq/346-484840018644-1kworker/0:2H11:24:080
81740,0rcu_preempt19-21ksoftirqd/108:06:361
10050740,0irq/346-48484001724-1kworker/0:4H09:21:130
10050740,0irq/346-48484001332-1kworker/0:1H10:27:110
81730,0rcu_preempt8314-21ssh11:38:561
81730,0rcu_preempt19-21ksoftirqd/107:39:411
81730,0rcu_preempt19-21ksoftirqd/107:32:091
10050730,0irq/346-484840016598-1kworker/0:2H09:42:200
81720,0rcu_preempt19-21ksoftirqd/111:45:221
81720,0rcu_preempt19-21ksoftirqd/111:14:321
81720,0rcu_preempt0-21swapper/110:23:111
10050720,0irq/346-484840025889-1kworker/0:0H12:04:540
10050720,0irq/346-484840016271-1kworker/0:0H10:50:290
81710,0rcu_preempt19-21ksoftirqd/111:05:551
81710,0rcu_preempt19-21ksoftirqd/107:57:391
10050710,0irq/346-484840028566-1kworker/0:1H11:30:010
81700,0rcu_preempt54-21kswapd011:41:331
81700,0rcu_preempt19-21ksoftirqd/108:14:071
81700,0rcu_preempt19-21ksoftirqd/108:09:571
81700,0rcu_preempt17794-21kworker/1:109:31:021
81700,0rcu_preempt0-21swapper/108:59:161
81690,0rcu_preempt54-21kswapd012:01:401
81690,0rcu_preempt19-21ksoftirqd/111:29:011
81690,0rcu_preempt19-21ksoftirqd/108:00:131
81690,0rcu_preempt19-21ksoftirqd/108:00:131
10050690,0irq/346-48484006682-1kworker/0:0H09:33:560
10050690,0irq/346-484840025889-1kworker/0:0H12:00:010
81680,0rcu_preempt54-21kswapd011:22:311
81680,0rcu_preempt19-21ksoftirqd/108:25:591
81680,0rcu_preempt1470-21runrttasks10:02:181
10050680,0irq/346-484840018874-1kworker/0:2H10:11:430
81670,0rcu_preempt54-21kswapd010:26:131
81670,0rcu_preempt19-21ksoftirqd/112:11:471
81670,0rcu_preempt19-21ksoftirqd/108:30:201
81670,0rcu_preempt19-21ksoftirqd/107:28:541
81670,0rcu_preempt19-21ksoftirqd/107:22:221
81660,0rcu_preempt54-21kswapd012:11:550
10050660,0irq/346-484840031199-1kworker/0:3H10:58:270
81650,0rcu_preempt2929-21ssh09:22:131
81650,0rcu_preempt19-21ksoftirqd/112:07:071
81650,0rcu_preempt19-21ksoftirqd/110:54:331
81650,0rcu_preempt19-21ksoftirqd/109:58:561
81650,0rcu_preempt19-21ksoftirqd/109:42:341
81650,0rcu_preempt1426-21munin-node10:19:300
81650,0rcu_preempt0-21swapper/109:27:551
81640,0rcu_preempt19-21ksoftirqd/111:49:041
81640,0rcu_preempt19-21ksoftirqd/107:46:581
81640,0rcu_preempt17794-21kworker/1:109:16:361
81640,0rcu_preempt16870-21dropbear07:14:151
81640,0rcu_preempt0-21swapper/112:19:311
81630,0rcu_preempt3-21ksoftirqd/011:54:270
81630,0rcu_preempt19-21ksoftirqd/110:04:451
81620,0rcu_preempt9950irq/345-484840011:49:200
81620,0rcu_preempt19-21ksoftirqd/112:18:261
81620,0rcu_preempt19-21ksoftirqd/109:50:321
81610,0rcu_preempt54-21kswapd011:00:581
81610,0rcu_preempt19-21ksoftirqd/111:13:011
81610,0rcu_preempt19-21ksoftirqd/108:38:131
81610,0rcu_preempt19-21ksoftirqd/107:50:311
81600,0rcu_preempt19-21ksoftirqd/112:37:181
81600,0rcu_preempt19-21ksoftirqd/111:56:351
81600,0rcu_preempt19-21ksoftirqd/109:10:071
81600,0rcu_preempt19-21ksoftirqd/108:44:131
81600,0rcu_preempt0-21swapper/108:49:241
81590,0rcu_preempt19-21ksoftirqd/109:04:191
81590,0rcu_preempt19-21ksoftirqd/108:39:231
81590,0rcu_preempt19-21ksoftirqd/107:35:211
81580,0rcu_preempt3-21ksoftirqd/012:21:390
81570,0rcu_preempt3-21ksoftirqd/012:36:270
81560,0rcu_preempt19-21ksoftirqd/108:54:271
81550,0rcu_preempt3-21ksoftirqd/008:14:190
81550,0rcu_preempt19-21ksoftirqd/107:09:191
10050550,0irq/346-484840081rcu_preempt10:04:160
10050550,0irq/346-484840054-21kswapd009:18:030
81530,0rcu_preempt3-21ksoftirqd/011:19:120
81530,0rcu_preempt3-21ksoftirqd/011:10:290
81530,0rcu_preempt3-21ksoftirqd/009:44:210
10050530,0irq/346-484840054-21kswapd010:33:550
81520,0rcu_preempt3-21ksoftirqd/010:34:170
10050520,0irq/346-484840054-21kswapd011:16:530
81510,0rcu_preempt851-21rngd10:43:140
81510,0rcu_preempt3-21ksoftirqd/012:14:130
10050500,0irq/346-484840054-21kswapd009:28:360
81490,0rcu_preempt3-21ksoftirqd/010:47:460
81490,0rcu_preempt3-21ksoftirqd/010:14:120
4350490,0irq/32-4330000054-21kswapd012:24:170
10050490,0irq/346-48484003970-21ssh11:34:170
10050480,0irq/346-484840054-21kswapd009:39:010
10050480,0irq/346-48484000-21swapper/009:54:380
10050470,0irq/346-484840054-21kswapd012:29:510
10050470,0irq/346-48484000-21swapper/007:54:120
81460,0rcu_preempt2115-21latency10:59:220
10050460,0irq/346-484840011049-1kworker/0:2H11:42:280
9950450,0irq/345-484840029237-21apt-get09:49:120
81450,0rcu_preempt3-21ksoftirqd/009:59:200
10050450,0irq/346-484840023608-1kworker/0:0H11:47:300
81440,0rcu_preempt3-21ksoftirqd/007:04:130
10050440,0irq/346-48484003783-1kworker/0:2H11:04:150
10050440,0irq/346-484840011668-1kworker/0:0H08:35:310
81430,0rcu_preempt19-21ksoftirqd/107:09:011
10050430,0irq/346-484840054-21kswapd009:05:350
81420,0rcu_preempt3-21ksoftirqd/008:09:260
81420,0rcu_preempt3-21ksoftirqd/007:21:190
81420,0rcu_preempt31449-21apt-get07:59:100
81420,0rcu_preempt31449-21apt-get07:59:100
10050420,0irq/346-484840012171-21munin-node0
9950410,0irq/345-48484001904-21runrttasks08:06:210
81410,0rcu_preempt3-21ksoftirqd/008:24:310
1599410,0migration/015916-21runrttasks07:09:260
9950400,0irq/345-48484008911-21aten_rapower_cu08:29:120
81400,0rcu_preempt3-21ksoftirqd/008:54:120
81400,0rcu_preempt3-21ksoftirqd/008:19:170
81400,0rcu_preempt18573-21kworker/0:207:24:140
14883994012,0cyclictest0-21swapper/007:34:160
10050400,0irq/346-484840013327-1kworker/0:2H08:44:270
81390,0rcu_preempt3-21ksoftirqd/007:49:250
81390,0rcu_preempt18573-21kworker/0:207:39:210
10050390,0irq/346-48484001286-21cron07:19:010
81380,0rcu_preempt3-21ksoftirqd/008:49:020
81370,0rcu_preempt3-21ksoftirqd/008:59:120
1488399372,0cyclictest0-21swapper/007:44:280
1488399352,0cyclictest0-21swapper/007:29:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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