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2026-08-23 - 18:20

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 23, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811140,0rcu_preempt19-21ksoftirqd/110:04:481
811050,0rcu_preempt9950irq/345-484840009:39:381
81870,0rcu_preempt3-21ksoftirqd/010:53:410
81850,0rcu_preempt19-21ksoftirqd/111:14:381
81840,0rcu_preempt3-21ksoftirqd/009:42:520
81840,0rcu_preempt3-21ksoftirqd/009:42:520
81840,0rcu_preempt3-21ksoftirqd/009:09:500
81840,0rcu_preempt3-21ksoftirqd/009:09:500
81840,0rcu_preempt3-21ksoftirqd/008:21:400
81840,0rcu_preempt3-21ksoftirqd/008:15:320
81820,0rcu_preempt3-21ksoftirqd/012:20:280
81810,0rcu_preempt3-21ksoftirqd/011:26:480
81810,0rcu_preempt3-21ksoftirqd/011:04:360
81810,0rcu_preempt3-21ksoftirqd/010:59:120
81810,0rcu_preempt3-21ksoftirqd/009:15:380
81810,0rcu_preempt3-21ksoftirqd/009:15:380
81810,0rcu_preempt3-21ksoftirqd/008:09:290
81810,0rcu_preempt29120-21diskmemload10:03:070
81800,0rcu_preempt3-21ksoftirqd/010:14:280
81800,0rcu_preempt3-21ksoftirqd/008:14:150
81800,0rcu_preempt3-21ksoftirqd/007:48:590
81790,0rcu_preempt3-21ksoftirqd/010:43:080
81790,0rcu_preempt29120-21diskmemload12:04:310
81790,0rcu_preempt12553-21ssh09:24:590
81780,0rcu_preempt3-21ksoftirqd/011:46:390
81780,0rcu_preempt3-21ksoftirqd/011:34:380
81780,0rcu_preempt3-21ksoftirqd/008:45:050
81780,0rcu_preempt3-21ksoftirqd/008:41:190
81780,0rcu_preempt29648-21ssh11:20:010
81770,0rcu_preempt9655-21ssh09:22:060
81770,0rcu_preempt3-21ksoftirqd/012:25:050
81770,0rcu_preempt3-21ksoftirqd/011:42:170
81770,0rcu_preempt3-21ksoftirqd/010:48:530
81770,0rcu_preempt3-21ksoftirqd/009:56:210
81770,0rcu_preempt3-21ksoftirqd/008:24:390
81770,0rcu_preempt3-21ksoftirqd/008:01:020
81770,0rcu_preempt29857-21ssh11:53:100
81760,0rcu_preempt3-21ksoftirqd/012:12:590
81760,0rcu_preempt3-21ksoftirqd/010:35:060
81760,0rcu_preempt3-21ksoftirqd/010:35:060
81760,0rcu_preempt3-21ksoftirqd/010:17:410
81760,0rcu_preempt3-21ksoftirqd/009:52:410
81760,0rcu_preempt3-21ksoftirqd/009:33:200
81760,0rcu_preempt3-21ksoftirqd/009:07:140
81760,0rcu_preempt3-21ksoftirqd/009:03:080
81760,0rcu_preempt3-21ksoftirqd/008:32:440
81760,0rcu_preempt26551-21kworker/0:111:05:410
81760,0rcu_preempt17523-21kworker/0:208:37:460
81760,0rcu_preempt11105-21kworker/0:210:23:060
81750,0rcu_preempt3-21ksoftirqd/012:30:000
81750,0rcu_preempt3-21ksoftirqd/012:08:000
81750,0rcu_preempt3-21ksoftirqd/011:34:220
81750,0rcu_preempt3-21ksoftirqd/011:12:430
81750,0rcu_preempt3-21ksoftirqd/010:29:470
81750,0rcu_preempt3-21ksoftirqd/010:24:480
81750,0rcu_preempt3-21ksoftirqd/009:45:120
81750,0rcu_preempt3-21ksoftirqd/007:58:110
81750,0rcu_preempt3-21ksoftirqd/007:09:560
81740,0rcu_preempt3-21ksoftirqd/011:54:470
81740,0rcu_preempt3-21ksoftirqd/011:19:040
81740,0rcu_preempt3-21ksoftirqd/010:08:510
81740,0rcu_preempt3-21ksoftirqd/009:36:460
81740,0rcu_preempt3-21ksoftirqd/008:58:280
81740,0rcu_preempt3-21ksoftirqd/007:17:160
81730,0rcu_preempt3-21ksoftirqd/012:37:210
81730,0rcu_preempt3-21ksoftirqd/007:54:200
81730,0rcu_preempt3-21ksoftirqd/007:34:590
81720,0rcu_preempt3-21ksoftirqd/012:18:290
81720,0rcu_preempt3-21ksoftirqd/008:50:280
81690,0rcu_preempt3-21ksoftirqd/007:39:560
81690,0rcu_preempt3-21ksoftirqd/007:30:070
81680,0rcu_preempt3-21ksoftirqd/007:25:080
81660,0rcu_preempt3-21ksoftirqd/007:19:490
81610,0rcu_preempt19-21ksoftirqd/111:59:561
10050580,0irq/346-484840054-21kswapd010:33:511
10050570,0irq/346-484840054-21kswapd011:01:081
10050540,0irq/346-484840054-21kswapd010:26:381
10050530,0irq/346-48484005776-1kworker/1:1H07:59:561
10050530,0irq/346-484840019247-21latency_hist08:39:371
81520,0rcu_preempt19-21ksoftirqd/108:55:001
10050520,0irq/346-484840054-21kswapd012:16:451
10050520,0irq/346-484840054-21kswapd011:38:571
10050510,0irq/346-484840054-21kswapd010:52:481
9950500,0irq/345-4848400836-21rngd10:36:061
9950500,0irq/345-4848400836-21rngd10:36:061
9950490,0irq/345-48484005974-21sshd09:50:481
9950490,0irq/345-484840026280-1kworker/1:2H11:20:441
10050490,0irq/346-484840054-21kswapd011:17:171
10050490,0irq/346-484840054-21kswapd009:45:421
10050490,0irq/346-484840054-21kswapd009:30:101
10050490,0irq/346-484840054-21kswapd009:28:031
10050480,0irq/346-484840054-21kswapd011:57:331
10050480,0irq/346-484840026811-1kworker/1:1H07:39:381
10050470,0irq/346-484840054-21kswapd011:32:181
10050470,0irq/346-484840054-21kswapd010:14:251
10050470,0irq/346-484840029563-21ps12:25:031
10050470,0irq/346-484840019-21ksoftirqd/112:21:321
10050460,0irq/346-484840025417-21ping07:45:141
10050460,0irq/346-4848400128392chrt09:58:161
10050460,0irq/346-48484000-21swapper/109:10:111
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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