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2026-08-16 - 09:12

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 Sun Aug 16, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811290,0rcu_preempt3-21ksoftirqd/021:33:580
811290,0rcu_preempt3-21ksoftirqd/021:33:580
811290,0rcu_preempt3-21ksoftirqd/021:21:100
811250,0rcu_preempt3-21ksoftirqd/023:09:160
811210,0rcu_preempt3-21ksoftirqd/000:24:080
811200,0rcu_preempt3-21ksoftirqd/022:20:030
811180,0rcu_preempt3-21ksoftirqd/023:17:490
811170,0rcu_preempt3-21ksoftirqd/022:57:010
811170,0rcu_preempt3-21ksoftirqd/000:34:020
811160,0rcu_preempt3-21ksoftirqd/023:57:250
811150,0rcu_preempt3-21ksoftirqd/022:35:470
811140,0rcu_preempt3-21ksoftirqd/000:36:190
811130,0rcu_preempt3-21ksoftirqd/023:42:370
811110,0rcu_preempt3-21ksoftirqd/022:54:270
811100,0rcu_preempt3-21ksoftirqd/023:52:250
811100,0rcu_preempt3-21ksoftirqd/022:43:500
811100,0rcu_preempt3-21ksoftirqd/021:53:300
811100,0rcu_preempt3-21ksoftirqd/000:09:310
811080,0rcu_preempt3-21ksoftirqd/021:58:010
811070,0rcu_preempt3-21ksoftirqd/022:29:070
811030,0rcu_preempt3-21ksoftirqd/021:38:070
811030,0rcu_preempt3-21ksoftirqd/000:10:520
811020,0rcu_preempt54-21kswapd022:04:450
811020,0rcu_preempt3-21ksoftirqd/021:49:050
811010,0rcu_preempt3-21ksoftirqd/021:40:010
81980,0rcu_preempt3-21ksoftirqd/000:25:100
81870,0rcu_preempt23875-21kworker/0:200:01:290
81850,0rcu_preempt3-21ksoftirqd/000:17:400
81850,0rcu_preempt24510-21kworker/0:120:10:380
81840,0rcu_preempt3-21ksoftirqd/020:07:140
81840,0rcu_preempt3-21ksoftirqd/019:57:030
81820,0rcu_preempt3-21ksoftirqd/023:22:030
81820,0rcu_preempt3-21ksoftirqd/022:18:550
81810,0rcu_preempt8810-21kworker/0:023:49:440
81810,0rcu_preempt3-21ksoftirqd/023:10:050
81810,0rcu_preempt3-21ksoftirqd/023:10:050
81810,0rcu_preempt3-21ksoftirqd/022:13:000
81810,0rcu_preempt23875-21kworker/0:223:32:370
81800,0rcu_preempt3-21ksoftirqd/023:01:200
81800,0rcu_preempt3-21ksoftirqd/022:49:150
81800,0rcu_preempt3-21ksoftirqd/021:17:510
81800,0rcu_preempt3-21ksoftirqd/021:00:080
81790,0rcu_preempt3-21ksoftirqd/022:04:340
81790,0rcu_preempt3-21ksoftirqd/021:10:460
81790,0rcu_preempt3-21ksoftirqd/020:18:260
81780,0rcu_preempt3-21ksoftirqd/023:37:460
81780,0rcu_preempt3-21ksoftirqd/020:39:560
81780,0rcu_preempt3-21ksoftirqd/020:22:080
81780,0rcu_preempt12064-21diskmemload23:25:470
81770,0rcu_preempt3-21ksoftirqd/020:49:460
81770,0rcu_preempt3-21ksoftirqd/020:49:460
81770,0rcu_preempt3-21ksoftirqd/019:10:080
81770,0rcu_preempt3033-21kworker/0:119:15:070
81770,0rcu_preempt12064-21diskmemload21:24:590
81760,0rcu_preempt27311-21cpu22:29:570
81750,0rcu_preempt3-21ksoftirqd/020:27:410
81750,0rcu_preempt3-21ksoftirqd/020:00:580
81740,0rcu_preempt3-21ksoftirqd/020:59:440
81740,0rcu_preempt22788-21kworker/0:219:34:010
81730,0rcu_preempt16213-21kworker/0:019:52:210
81700,0rcu_preempt3-21ksoftirqd/020:47:380
81690,0rcu_preempt3-21ksoftirqd/021:06:530
81690,0rcu_preempt3-21ksoftirqd/021:06:530
81680,0rcu_preempt3-21ksoftirqd/019:29:440
10050670,0irq/346-484840054-21kswapd023:40:131
10050660,0irq/346-48484005089-21cyclictest23:45:581
81640,0rcu_preempt3-21ksoftirqd/019:34:580
81620,0rcu_preempt3-21ksoftirqd/020:30:530
10050610,0irq/346-484840011362-21ssh21:40:351
9950600,0irq/345-4848400181ktimersoftd/122:00:221
9950590,0irq/345-4848400181ktimersoftd/100:18:521
10050590,0irq/346-484840029441-21ssh23:04:461
10050590,0irq/346-4848400171rcuc/123:18:321
10050590,0irq/346-48484001073-21ssh21:30:131
10050590,0irq/346-48484001073-21ssh21:30:131
10050590,0irq/346-48484000-21swapper/121:13:541
9950580,0irq/345-484840019-21ksoftirqd/121:59:451
10050580,0irq/346-48484009496-21ssh23:49:531
10050580,0irq/346-484840030342-21ssh22:32:441
10050570,0irq/346-48484000-21swapper/121:26:561
10050560,0irq/346-484840018537-21ssh22:20:171
509099551,0cyclictest8369-21ping19:44:580
10050550,0irq/346-484840027647-21ssh00:07:481
10050550,0irq/346-484840021950-21ssh21:19:381
10050550,0irq/346-4848400181ktimersoftd/100:11:081
9950540,0irq/345-484840019-21ksoftirqd/121:04:441
81540,0rcu_preempt3-21ksoftirqd/019:41:190
81540,0rcu_preempt3-21ksoftirqd/019:41:190
10050540,0irq/346-484840014767-21ssh22:16:521
81530,0rcu_preempt8027-1kworker/0:0H19:20:160
10050530,0irq/346-48484009702-21seq00:22:141
9950520,0irq/345-484840012242-1kworker/1:1H21:45:041
10050520,0irq/346-484840022205-21diskmemload21:19:461
9950510,0irq/345-4848400509199cyclictest23:20:471
9950510,0irq/345-4848400171rcuc/100:27:271
10050500,0irq/346-484840013886-21ssh22:49:081
10050500,0irq/346-48484000-21swapper/123:12:491
10050500,0irq/346-48484000-21swapper/123:12:491
9950480,0irq/345-48484002232-1kworker/1:0H22:37:471
9950480,0irq/345-4848400181ktimersoftd/100:37:071
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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