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2026-05-17 - 14:51

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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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 May 17, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811230,0rcu_preempt3-21ksoftirqd/010:13:330
811170,0rcu_preempt3-21ksoftirqd/010:58:130
811140,0rcu_preempt3-21ksoftirqd/012:12:190
811100,0rcu_preempt3-21ksoftirqd/009:19:100
811080,0rcu_preempt3-21ksoftirqd/009:08:220
811040,0rcu_preempt3-21ksoftirqd/011:43:480
811030,0rcu_preempt3-21ksoftirqd/010:24:340
81980,0rcu_preempt3-21ksoftirqd/011:23:050
81980,0rcu_preempt3-21ksoftirqd/009:46:340
81970,0rcu_preempt3-21ksoftirqd/012:33:380
81940,0rcu_preempt3-21ksoftirqd/011:42:150
81920,0rcu_preempt3-21ksoftirqd/010:48:250
81910,0rcu_preempt54-21kswapd012:23:170
81900,0rcu_preempt3-21ksoftirqd/010:06:100
81870,0rcu_preempt3-21ksoftirqd/007:28:090
81840,0rcu_preempt3-21ksoftirqd/007:33:110
81780,0rcu_preempt19-21ksoftirqd/109:43:201
81780,0rcu_preempt19-21ksoftirqd/107:22:191
81730,0rcu_preempt24712-21kworker/0:110:20:560
81710,0rcu_preempt3-21ksoftirqd/011:35:440
81710,0rcu_preempt24712-21kworker/0:110:12:250
81690,0rcu_preempt20653-21df_abs08:43:140
81680,0rcu_preempt21588-21aten_rapower_po12:18:120
81670,0rcu_preempt3-21ksoftirqd/010:38:170
81670,0rcu_preempt3-21ksoftirqd/009:23:420
81670,0rcu_preempt29595-21kworker/0:110:55:400
81650,0rcu_preempt3-21ksoftirqd/007:18:230
81640,0rcu_preempt32614-21kworker/0:107:40:560
81640,0rcu_preempt30117-21ps11:53:240
81640,0rcu_preempt11948-21kworker/0:209:31:100
81630,0rcu_preempt0-21swapper/011:06:120
81620,0rcu_preempt7058-21kworker/0:111:52:050
81620,0rcu_preempt3-21ksoftirqd/008:13:000
10050620,0irq/346-484840054-21kswapd009:58:150
81610,0rcu_preempt8482-21dropbear09:53:150
81610,0rcu_preempt3-21ksoftirqd/007:26:220
81610,0rcu_preempt11948-21kworker/0:209:49:130
81610,0rcu_preempt0-21swapper/012:05:300
81610,0rcu_preempt0-21swapper/011:22:130
10050610,0irq/346-48484008584-1kworker/1:0H09:22:021
10050610,0irq/346-484840028371-1kworker/1:2H12:26:141
10050610,0irq/346-484840027688-1kworker/1:3H10:54:281
10050610,0irq/346-484840020017-1kworker/1:0H11:13:031
10050610,0irq/346-484840015084-1kworker/1:1H11:05:411
81600,0rcu_preempt0-21swapper/010:46:100
81600,0rcu_preempt0-21swapper/010:29:440
10050600,0irq/346-484840054-21kswapd009:51:411
10050600,0irq/346-484840024713-1kworker/1:1H10:11:371
81590,0rcu_preempt3-21ksoftirqd/008:03:110
81590,0rcu_preempt0-21swapper/009:41:100
10050590,0irq/346-484840054-21kswapd011:51:431
10050590,0irq/346-48484002440-1kworker/1:1H11:26:441
10050590,0irq/346-484840017235-1kworker/1:0H11:41:041
10050590,0irq/346-484840012828-1kworker/1:0H10:33:271
10050590,0irq/346-484840012823-1kworker/1:1H12:09:531
81580,0rcu_preempt3-21ksoftirqd/007:13:230
81580,0rcu_preempt21542-21cyclictest11:31:230
81580,0rcu_preempt21542-21cyclictest11:31:230
81580,0rcu_preempt16484-21kworker/0:212:30:080
81580,0rcu_preempt0-21swapper/011:11:080
10050580,0irq/346-48484007894-1kworker/1:1H10:27:031
10050580,0irq/346-484840054-21kswapd011:44:531
10050580,0irq/346-48484002154699cyclictest12:37:581
81570,0rcu_preempt3-21ksoftirqd/012:13:180
81570,0rcu_preempt3-21ksoftirqd/008:53:110
81570,0rcu_preempt3-21ksoftirqd/008:23:200
81570,0rcu_preempt3-21ksoftirqd/007:08:230
10050570,0irq/346-48484007369-1kworker/1:0H11:32:041
10050570,0irq/346-48484007369-1kworker/1:0H11:32:041
10050570,0irq/346-484840018441-1kworker/1:1H09:34:011
10050570,0irq/346-4848400181ktimersoftd/111:53:401
81560,0rcu_preempt3-21ksoftirqd/009:13:230
81560,0rcu_preempt3-21ksoftirqd/007:48:100
81560,0rcu_preempt19-21ksoftirqd/108:13:151
81560,0rcu_preempt0-21swapper/009:35:000
10050560,0irq/346-484840024949-1kworker/1:1H11:19:181
10050560,0irq/346-484840018548-1kworker/1:2H12:17:511
10050560,0irq/346-484840018441-1kworker/1:1H09:30:351
10050560,0irq/346-4848400181ktimersoftd/111:10:111
81550,0rcu_preempt5762-1kworker/1:3H09:58:001
81550,0rcu_preempt19-21ksoftirqd/109:38:181
81550,0rcu_preempt11948-21kworker/0:210:34:270
81550,0rcu_preempt0-21swapper/011:17:080
10050550,0irq/346-484840030386-1kworker/1:2H10:18:491
10050550,0irq/346-484840023297-1kworker/1:0H09:08:571
9950540,0irq/345-48484002154699cyclictest10:30:411
81540,0rcu_preempt5168-21ping08:11:180
81540,0rcu_preempt0-21swapper/012:02:580
81540,0rcu_preempt0-21swapper/008:33:110
10050540,0irq/346-48484006996-1kworker/1:0H12:07:191
10050540,0irq/346-484840030386-1kworker/1:2H10:49:201
10050540,0irq/346-484840022163-1kworker/1:1H11:58:261
10050540,0irq/346-4848400181ktimersoftd/112:21:371
10050540,0irq/346-484840012310-1kworker/1:1H11:36:551
10050540,0irq/346-484840010687-1kworker/1:0H09:57:481
81530,0rcu_preempt3-21ksoftirqd/009:03:230
81530,0rcu_preempt0-21swapper/008:00:460
10050530,0irq/346-484840017901-1kworker/0:3H07:03:170
10050530,0irq/346-4848400171rcuc/110:58:311
10050520,0irq/346-484840054-21kswapd009:14:211
81510,0rcu_preempt3-21ksoftirqd/008:38:250
81510,0rcu_preempt3-21ksoftirqd/008:28:250
81510,0rcu_preempt11948-21kworker/0:208:18:040
10050510,0irq/346-484840020155-21ssh10:38:111
81500,0rcu_preempt3-21ksoftirqd/008:58:190
81500,0rcu_preempt3-21ksoftirqd/008:48:230
10050500,0irq/346-484840024713-1kworker/1:1H10:14:001
81490,0rcu_preempt3-21ksoftirqd/007:43:360
10050490,0irq/346-484840054-21kswapd012:28:571
81480,0rcu_preempt3-21ksoftirqd/007:53:000
10050460,0irq/346-484840012890-21ssh09:24:121
10050450,0irq/346-4848400181ktimersoftd/110:05:181
10050440,0irq/346-484840027842-21ssh10:45:261
10050430,0irq/346-484840024829-21ping07:28:111
10050430,0irq/346-484840024829-21ping07:23:321
9950420,0irq/345-48484000-21swapper/107:38:221
81420,0rcu_preempt19-21ksoftirqd/107:33:111
10050420,0irq/346-48484000-21swapper/108:48:151
81400,0rcu_preempt19-21ksoftirqd/109:04:561
81390,0rcu_preempt19-21ksoftirqd/107:58:131
81390,0rcu_preempt14617-21ps08:23:271
10050390,0irq/346-48484000-21swapper/108:53:171
81380,0rcu_preempt19-21ksoftirqd/108:18:291
81380,0rcu_preempt19-21ksoftirqd/107:13:591
81370,0rcu_preempt19-21ksoftirqd/107:03:271
9950360,0irq/345-48484002154699cyclictest07:53:091
81360,0rcu_preempt20731-21php-cgi08:43:171
81360,0rcu_preempt19-21ksoftirqd/107:43:101
81350,0rcu_preempt19-21ksoftirqd/108:08:241
81340,0rcu_preempt19-21ksoftirqd/108:38:001
81340,0rcu_preempt19-21ksoftirqd/108:33:271
81340,0rcu_preempt19-21ksoftirqd/108:28:211
81340,0rcu_preempt19-21ksoftirqd/107:13:001
10050340,0irq/346-48484000-21swapper/108:06:481
81330,0rcu_preempt19-21ksoftirqd/107:48:001
81320,0rcu_preempt19-21ksoftirqd/109:01:361
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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