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2026-08-28 - 22:40

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 28, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811480,0rcu_preempt19-21ksoftirqd/107:40:001
81940,0rcu_preempt3-21ksoftirqd/009:30:220
81940,0rcu_preempt3-21ksoftirqd/009:30:220
81930,0rcu_preempt3-21ksoftirqd/008:54:590
81910,0rcu_preempt19-21ksoftirqd/109:35:211
81910,0rcu_preempt19-21ksoftirqd/108:04:571
81910,0rcu_preempt19-21ksoftirqd/108:04:571
81870,0rcu_preempt19-21ksoftirqd/109:39:341
10050820,0irq/346-484840041ktimersoftd/009:59:410
10050820,0irq/346-4848400111rcuc/009:16:580
81810,0rcu_preempt20317-21kworker/1:211:29:491
10050810,0irq/346-4848400111rcuc/009:45:240
10050810,0irq/346-4848400111rcuc/009:45:240
32282997810,0cyclictest10414-1kworker/0:2H11:27:360
81770,0rcu_preempt3-21ksoftirqd/012:26:570
10050770,0irq/346-4848400111rcuc/010:17:010
81760,0rcu_preempt19-21ksoftirqd/107:19:351
10050760,0irq/346-484840041ktimersoftd/010:47:080
10050760,0irq/346-4848400111rcuc/010:32:490
81750,0rcu_preempt3-21ksoftirqd/011:52:550
81740,0rcu_preempt3-21ksoftirqd/010:05:120
81740,0rcu_preempt3-21ksoftirqd/009:57:310
10050740,0irq/346-4848400111rcuc/010:23:500
81730,0rcu_preempt3-21ksoftirqd/012:30:310
81730,0rcu_preempt3-21ksoftirqd/011:12:570
81730,0rcu_preempt3-21ksoftirqd/011:05:090
81730,0rcu_preempt3-21ksoftirqd/010:56:430
81730,0rcu_preempt3-21ksoftirqd/010:40:310
81730,0rcu_preempt19-21ksoftirqd/110:25:091
81720,0rcu_preempt3-21ksoftirqd/010:11:200
81720,0rcu_preempt19-21ksoftirqd/107:59:491
10050720,0irq/346-4848400111rcuc/011:29:490
81710,0rcu_preempt54-21kswapd012:26:561
81710,0rcu_preempt54-21kswapd010:09:301
81710,0rcu_preempt3-21ksoftirqd/011:55:540
81710,0rcu_preempt3-21ksoftirqd/011:47:210
81710,0rcu_preempt3-21ksoftirqd/011:21:480
10050710,0irq/346-4848400111rcuc/010:28:330
81700,0rcu_preempt3-21ksoftirqd/012:13:450
81700,0rcu_preempt19-21ksoftirqd/112:15:001
81690,0rcu_preempt3-21ksoftirqd/011:41:520
81690,0rcu_preempt3-21ksoftirqd/011:37:040
81690,0rcu_preempt19-21ksoftirqd/110:59:281
81680,0rcu_preempt32427-21ssh11:12:241
81680,0rcu_preempt19-21ksoftirqd/110:49:461
81670,0rcu_preempt3-21ksoftirqd/012:08:520
81670,0rcu_preempt3-21ksoftirqd/010:34:490
81670,0rcu_preempt19-21ksoftirqd/111:48:301
81670,0rcu_preempt19-21ksoftirqd/109:16:231
81660,0rcu_preempt19-21ksoftirqd/110:23:231
81660,0rcu_preempt19-21ksoftirqd/109:54:051
81650,0rcu_preempt3-21ksoftirqd/009:04:470
81640,0rcu_preempt3-21ksoftirqd/008:09:490
81640,0rcu_preempt19-21ksoftirqd/112:02:381
3228299642,0cyclictest0-21swapper/009:40:530
81630,0rcu_preempt19-21ksoftirqd/112:23:161
81630,0rcu_preempt19-21ksoftirqd/111:03:461
81620,0rcu_preempt19-21ksoftirqd/110:02:111
3228299621,0cyclictest3157-21ping07:32:440
10050620,0irq/346-48484006776-1kworker/1:2H09:45:591
10050620,0irq/346-48484006776-1kworker/1:2H09:45:591
81610,0rcu_preempt3-21ksoftirqd/009:21:470
81610,0rcu_preempt19-21ksoftirqd/112:11:421
81610,0rcu_preempt19-21ksoftirqd/109:11:531
32282996111,0cyclictest7732-1kworker/0:0H07:35:060
10050610,0irq/346-484840031927-1kworker/0:1H12:19:080
10050610,0irq/346-484840021179-1kworker/1:3H12:06:481
81600,0rcu_preempt3-21ksoftirqd/008:39:490
81600,0rcu_preempt19-21ksoftirqd/111:39:261
81600,0rcu_preempt19-21ksoftirqd/109:32:261
81600,0rcu_preempt19-21ksoftirqd/109:32:261
81600,0rcu_preempt10050irq/346-484840007:40:080
3228299607,0cyclictest9668-21ssh10:49:480
3228299602,0cyclictest22469-21munin-node0
3228299602,0cyclictest0-21swapper/008:21:490
32282996014,0cyclictest0-21swapper/009:49:570
10050600,0irq/346-484840031961-21ssh09:34:420
3228299596,0cyclictest836-21rngd09:14:160
81580,0rcu_preempt19-21ksoftirqd/111:49:581
3228299581,0cyclictest14282-1kworker/0:3H12:04:040
3228299578,0cyclictest3157-21ping07:19:340
32282995713,0cyclictest0-21swapper/007:59:280
10050570,0irq/346-48484001990-1kworker/1:1H11:56:141
81560,0rcu_preempt3-21ksoftirqd/008:44:440
81560,0rcu_preempt19-21ksoftirqd/111:41:171
3228299563,0cyclictest0-21swapper/008:14:520
3228299562,0cyclictest3157-21ping07:44:460
3228299562,0cyclictest3157-21ping07:19:440
32282995614,0cyclictest0-21swapper/011:02:420
81550,0rcu_preempt3-21ksoftirqd/012:34:490
81550,0rcu_preempt3-21ksoftirqd/011:18:530
81550,0rcu_preempt19-21ksoftirqd/110:09:461
81550,0rcu_preempt19-21ksoftirqd/109:54:481
81540,0rcu_preempt19-21ksoftirqd/110:33:411
81540,0rcu_preempt19-21ksoftirqd/110:14:521
81540,0rcu_preempt19-21ksoftirqd/109:24:531
3228299542,0cyclictest0-21swapper/012:22:150
32282995412,0cyclictest0-21swapper/007:50:040
81530,0rcu_preempt3-21ksoftirqd/007:09:480
3228299532,0cyclictest4966-21chrt07:24:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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