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2026-03-09 - 22:32

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Mon Mar 09, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811490,0rcu_preempt3-21ksoftirqd/012:09:220
811490,0rcu_preempt3-21ksoftirqd/012:09:220
811400,0rcu_preempt3-21ksoftirqd/011:00:110
811400,0rcu_preempt3-21ksoftirqd/010:06:070
811360,0rcu_preempt3-21ksoftirqd/010:51:000
811350,0rcu_preempt3-21ksoftirqd/009:59:220
811330,0rcu_preempt3-21ksoftirqd/011:34:210
811320,0rcu_preempt3-21ksoftirqd/010:24:020
811260,0rcu_preempt3-21ksoftirqd/011:25:470
811250,0rcu_preempt3-21ksoftirqd/011:31:200
811030,0rcu_preempt3-21ksoftirqd/009:29:310
81970,0rcu_preempt3-21ksoftirqd/008:04:050
81900,0rcu_preempt3-21ksoftirqd/010:34:160
81880,0rcu_preempt3-21ksoftirqd/012:29:260
81840,0rcu_preempt3-21ksoftirqd/007:49:150
81830,0rcu_preempt3-21ksoftirqd/011:09:360
81820,0rcu_preempt3-21ksoftirqd/009:18:530
10050800,0irq/346-484840054-21kswapd011:04:320
81790,0rcu_preempt54-21kswapd008:09:350
81790,0rcu_preempt3-21ksoftirqd/008:19:330
81780,0rcu_preempt3-21ksoftirqd/012:24:470
81770,0rcu_preempt3-21ksoftirqd/012:15:470
81770,0rcu_preempt3-21ksoftirqd/011:49:490
81770,0rcu_preempt3-21ksoftirqd/011:14:060
81770,0rcu_preempt3-21ksoftirqd/010:33:040
81740,0rcu_preempt3-21ksoftirqd/009:24:310
81730,0rcu_preempt3-21ksoftirqd/010:43:090
81730,0rcu_preempt3-21ksoftirqd/010:43:090
81730,0rcu_preempt3-21ksoftirqd/009:34:320
81720,0rcu_preempt3-21ksoftirqd/012:04:170
10050720,0irq/346-4848400171rcuc/110:44:361
10050710,0irq/346-484840015275-1kworker/0:3H11:42:070
81700,0rcu_preempt3-21ksoftirqd/010:54:520
10050700,0irq/346-48484007581-1kworker/0:2H09:23:540
81690,0rcu_preempt3-21ksoftirqd/011:54:080
81690,0rcu_preempt3-21ksoftirqd/009:44:160
10050690,0irq/346-48484002334-1kworker/0:1H12:00:500
81680,0rcu_preempt54-21kswapd010:09:220
10050670,0irq/346-48484009657-1kworker/0:1H09:57:530
10050670,0irq/346-484840028080-1kworker/0:1H11:23:160
10050630,0irq/346-484840026939-1kworker/0:2H09:10:240
81620,0rcu_preempt0-21swapper/109:50:271
81620,0rcu_preempt0-21swapper/109:50:271
10050620,0irq/346-4848400171rcuc/112:18:431
10050620,0irq/346-4848400171rcuc/111:46:491
10050620,0irq/346-4848400171rcuc/110:57:361
10050610,0irq/346-484840027307-1kworker/0:2H09:42:430
10050610,0irq/346-484840017996-21munin-node0
81600,0rcu_preempt3-21ksoftirqd/010:24:420
10050600,0irq/346-48484003594-21ssh12:35:130
10050600,0irq/346-4848400181ktimersoftd/110:40:291
10050600,0irq/346-4848400181ktimersoftd/110:40:291
10050600,0irq/346-4848400171rcuc/109:40:291
10050600,0irq/346-4848400171rcuc/109:31:541
10050590,0irq/346-4848400181ktimersoftd/111:43:231
10050580,0irq/346-4848400171rcuc/111:54:491
10050580,0irq/346-4848400171rcuc/111:17:101
10050580,0irq/346-4848400171rcuc/109:26:181
81570,0rcu_preempt3-21ksoftirqd/010:17:300
81560,0rcu_preempt54-21kswapd009:52:210
81560,0rcu_preempt54-21kswapd009:52:210
10050560,0irq/346-484840027116-21rm10:47:190
10050560,0irq/346-48484002334-1kworker/0:1H12:20:440
10050560,0irq/346-4848400181ktimersoftd/110:52:271
10050560,0irq/346-4848400171rcuc/109:48:131
9950550,0irq/345-4848400181ktimersoftd/109:19:221
81550,0rcu_preempt3-21ksoftirqd/008:24:180
81550,0rcu_preempt22342-21kworker/1:112:13:311
81550,0rcu_preempt22342-21kworker/1:112:13:311
10050550,0irq/346-4848400181ktimersoftd/112:32:011
9950540,0irq/345-4848400171rcuc/111:24:241
81540,0rcu_preempt24362-1kworker/1:0H10:17:201
13250540,0irq/301-480200017701-21ssh08:39:190
13250540,0irq/301-480200017701-21ssh08:39:190
10050540,0irq/346-4848400181ktimersoftd/111:13:341
10050540,0irq/346-4848400181ktimersoftd/107:44:331
10050540,0irq/346-4848400171rcuc/110:20:331
10050540,0irq/346-4848400171rcuc/110:00:411
81530,0rcu_preempt54-21kswapd011:36:171
81530,0rcu_preempt54-21kswapd009:55:141
81530,0rcu_preempt19-21ksoftirqd/111:59:251
10050530,0irq/346-4848400181ktimersoftd/110:06:081
10050530,0irq/346-4848400171rcuc/110:11:021
81520,0rcu_preempt3-21ksoftirqd/008:04:200
81520,0rcu_preempt19-21ksoftirqd/109:09:241
10050520,0irq/346-4848400181ktimersoftd/110:28:061
2020299512,0cyclictest0-21swapper/112:34:171
10050510,0irq/346-484840025125-21cron07:24:040
10050510,0irq/346-4848400181ktimersoftd/111:04:451
81500,0rcu_preempt19-21ksoftirqd/108:09:281
10050500,0irq/346-4848400171rcuc/111:19:411
81490,0rcu_preempt19-21ksoftirqd/107:14:281
2020299499,0cyclictest20853-21diskmemload12:19:351
20202994912,0cyclictest8693-21ssh11:01:111
20202994910,0cyclictest24303-21forks08:59:211
10050490,0irq/346-484840025295-21ssh11:51:121
10050490,0irq/346-4848400181ktimersoftd/109:39:001
81480,0rcu_preempt3-21ksoftirqd/008:44:200
81480,0rcu_preempt26501-21ssh12:25:311
81480,0rcu_preempt19-21ksoftirqd/108:03:021
10050480,0irq/346-484840025961-21ntp_states07:24:310
81470,0rcu_preempt25624-21wc09:04:050
2020299472,0cyclictest0-21swapper/112:04:471
20202994710,0cyclictest27198-21diskmemload09:17:361
2020199479,0cyclictest3-21ksoftirqd/008:14:310
81460,0rcu_preempt19-21ksoftirqd/107:26:091
81460,0rcu_preempt19-21ksoftirqd/107:19:311
2020299469,0cyclictest13693-21runrttasks08:25:231
2020299465,0cyclictest23484-21ping07:40:421
2020299462,0cyclictest3728-21ssh11:29:211
20201994612,0cyclictest3-21ksoftirqd/007:14:280
10050460,0irq/346-48484003479-21zcat07:54:280
81450,0rcu_preempt19-21ksoftirqd/110:36:561
2020299459,0cyclictest5568-1kworker/1:3H08:05:281
2020299459,0cyclictest29291-1kworker/1:2H10:30:431
2020299459,0cyclictest1470-21runrttasks08:15:311
20202994510,0cyclictest10050irq/346-484840008:54:251
9950440,0irq/345-484840027284-21cat09:09:050
81440,0rcu_preempt19-21ksoftirqd/108:23:331
81440,0rcu_preempt19-21ksoftirqd/107:04:221
187002440,0chrt18244-1kworker/0:2H07:04:160
81430,0rcu_preempt19-21ksoftirqd/107:09:261
2020299438,0cyclictest2910-21sh07:54:181
2020299432,0cyclictest14194-21apt-get08:29:141
2020199432,0cyclictest23484-21ping07:29:270
10050430,0irq/346-484840023484-21ping07:34:411
10050430,0irq/346-484840013771-1kworker/0:2H08:29:250
2020299428,0cyclictest10050irq/346-484840008:49:231
2020299422,0cyclictest27187-21runrttasks09:09:041
20202994211,0cyclictest1470-21runrttasks08:44:031
20202994211,0cyclictest1470-21runrttasks08:44:031
20202994210,0cyclictest0-21swapper/108:34:281
9950410,0irq/345-4848400588-1kworker/0:1H07:49:050
9950410,0irq/345-484840021160-21munin-node0
81410,0rcu_preempt19-21ksoftirqd/107:49:231
2020299418,0cyclictest26478-1kworker/1:1H07:29:241
2020299411,0cyclictest19777-21ntpdc08:44:271
9950400,0irq/345-484840031564-21runrttasks07:42:510
81400,0rcu_preempt16639-21wc08:34:300
10050400,0irq/346-48484000-21swapper/008:54:270
10050390,0irq/346-484840020606-21http_loadtime07:09:210
81370,0rcu_preempt3-21ksoftirqd/007:34:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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