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2026-08-14 - 23:11

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Fri Aug 14, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811450,0rcu_preempt3-21ksoftirqd/012:11:520
811450,0rcu_preempt0-21swapper/012:24:160
811420,0rcu_preempt3-21ksoftirqd/011:22:160
811420,0rcu_preempt3-21ksoftirqd/011:22:160
811410,0rcu_preempt3-21ksoftirqd/010:35:540
811410,0rcu_preempt3-21ksoftirqd/010:35:540
811380,0rcu_preempt3-21ksoftirqd/011:44:510
811370,0rcu_preempt3-21ksoftirqd/011:12:210
811300,0rcu_preempt3-21ksoftirqd/009:14:520
811290,0rcu_preempt3-21ksoftirqd/009:45:080
811260,0rcu_preempt3-21ksoftirqd/010:25:310
811240,0rcu_preempt3-21ksoftirqd/010:56:510
811230,0rcu_preempt3-21ksoftirqd/010:08:130
811200,0rcu_preempt3-21ksoftirqd/011:53:590
811160,0rcu_preempt3-21ksoftirqd/009:44:050
811140,0rcu_preempt3-21ksoftirqd/010:15:490
811020,0rcu_preempt3-21ksoftirqd/010:21:240
81890,0rcu_preempt3-21ksoftirqd/012:16:330
81840,0rcu_preempt3-21ksoftirqd/010:49:490
81810,0rcu_preempt3-21ksoftirqd/012:26:370
81810,0rcu_preempt3-21ksoftirqd/009:53:420
81810,0rcu_preempt27941-21ssh09:25:020
81800,0rcu_preempt3-21ksoftirqd/010:44:460
81800,0rcu_preempt3-21ksoftirqd/008:01:180
81780,0rcu_preempt3-21ksoftirqd/011:40:070
81780,0rcu_preempt3-21ksoftirqd/010:10:030
81770,0rcu_preempt3-21ksoftirqd/009:58:530
81770,0rcu_preempt3-21ksoftirqd/009:58:530
10050770,0irq/346-484840054-21kswapd012:05:270
10050770,0irq/346-484840054-21kswapd011:19:250
81760,0rcu_preempt3-21ksoftirqd/012:37:130
81760,0rcu_preempt3-21ksoftirqd/012:03:260
81760,0rcu_preempt3-21ksoftirqd/011:35:000
81760,0rcu_preempt3-21ksoftirqd/008:25:040
10050760,0irq/346-484840054-21kswapd011:25:300
10050760,0irq/346-484840054-21kswapd009:14:130
81750,0rcu_preempt3-21ksoftirqd/010:45:100
81750,0rcu_preempt3-21ksoftirqd/009:30:170
81750,0rcu_preempt3-21ksoftirqd/009:23:260
10050750,0irq/346-484840054-21kswapd011:32:270
10050750,0irq/346-484840054-21kswapd011:32:270
81740,0rcu_preempt3-21ksoftirqd/011:59:460
10050740,0irq/346-484840054-21kswapd011:03:290
10050730,0irq/346-484840054-21kswapd010:30:240
10050730,0irq/346-484840054-21kswapd009:38:400
10050730,0irq/346-484840031689-1kworker/0:1H11:09:160
81690,0rcu_preempt3-21ksoftirqd/010:03:550
81690,0rcu_preempt3-21ksoftirqd/008:19:560
81680,0rcu_preempt3-21ksoftirqd/008:41:020
81670,0rcu_preempt3-21ksoftirqd/008:50:030
10050650,0irq/346-4848400171rcuc/110:50:161
81640,0rcu_preempt3-21ksoftirqd/012:30:180
10050640,0irq/346-4848400181ktimersoftd/109:18:151
10050630,0irq/346-4848400171rcuc/111:33:101
10050630,0irq/346-4848400171rcuc/111:33:101
10050630,0irq/346-4848400171rcuc/109:32:351
10050620,0irq/346-4848400171rcuc/112:26:581
9950610,0irq/345-4848400181ktimersoftd/110:46:021
10050610,0irq/346-4848400181ktimersoftd/111:07:241
10050610,0irq/346-4848400181ktimersoftd/111:02:081
10050610,0irq/346-4848400181ktimersoftd/110:55:541
10050610,0irq/346-4848400171rcuc/112:22:201
10050610,0irq/346-4848400171rcuc/109:45:051
10050600,0irq/346-4848400171rcuc/111:13:141
10050600,0irq/346-4848400171rcuc/109:09:471
10050590,0irq/346-4848400171rcuc/110:06:041
81580,0rcu_preempt0-21swapper/109:39:481
10050580,0irq/346-4848400171rcuc/112:04:571
10050580,0irq/346-4848400171rcuc/109:20:061
10050570,0irq/346-4848400171rcuc/112:18:261
10050570,0irq/346-4848400171rcuc/111:55:511
10050570,0irq/346-4848400171rcuc/111:40:111
10050570,0irq/346-4848400171rcuc/109:36:121
9950560,0irq/345-4848400181ktimersoftd/111:29:451
10050560,0irq/346-4848400181ktimersoftd/111:17:421
10050560,0irq/346-4848400181ktimersoftd/110:26:301
10050560,0irq/346-4848400171rcuc/112:39:091
9950550,0irq/345-48484000-21swapper/008:45:050
81550,0rcu_preempt54-21kswapd010:00:221
10050550,0irq/346-4848400181ktimersoftd/111:36:371
9950540,0irq/345-4848400171rcuc/110:23:561
10050540,0irq/346-4848400181ktimersoftd/109:25:001
10050540,0irq/346-48484000-21swapper/109:55:161
10050540,0irq/346-48484000-21swapper/109:55:161
9950530,0irq/345-48484009306-21latency_hist08:59:450
9950530,0irq/345-4848400171rcuc/112:32:131
10050530,0irq/346-48484002453-1kworker/0:3H08:39:460
10050530,0irq/346-4848400171rcuc/111:48:551
10050530,0irq/346-4848400171rcuc/110:19:411
10050530,0irq/346-48484001106-21latency_hist08:34:460
9950510,0irq/345-4848400171rcuc/107:11:371
9950490,0irq/345-48484008907-21ping07:44:460
81490,0rcu_preempt14623-21ntpdc07:35:140
562999497,0cyclictest7484-21diskstats10:10:031
10050490,0irq/346-484840020086-1kworker/0:0H07:55:140
9950480,0irq/345-48484000-21swapper/008:04:570
81480,0rcu_preempt54-21kswapd008:04:491
81480,0rcu_preempt19-21ksoftirqd/110:33:041
10050480,0irq/346-484840026656-1kworker/0:0H08:16:480
562999479,0cyclictest31769-21sh10:34:561
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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