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2026-09-07 - 18:36

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 Mon Sep 07, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811080,0rcu_preempt3-21ksoftirqd/010:26:010
811040,0rcu_preempt54-21kswapd012:17:270
81970,0rcu_preempt3-21ksoftirqd/010:43:120
81960,0rcu_preempt3-21ksoftirqd/010:33:390
81960,0rcu_preempt3-21ksoftirqd/009:32:510
81940,0rcu_preempt3-21ksoftirqd/009:14:030
81920,0rcu_preempt19-21ksoftirqd/109:19:241
81850,0rcu_preempt19-21ksoftirqd/112:04:491
81850,0rcu_preempt19-21ksoftirqd/112:04:491
81810,0rcu_preempt3-21ksoftirqd/009:20:420
81800,0rcu_preempt0-21swapper/008:04:510
81790,0rcu_preempt3-21ksoftirqd/012:01:400
81790,0rcu_preempt3-21ksoftirqd/009:40:570
81770,0rcu_preempt3-21ksoftirqd/010:49:390
81750,0rcu_preempt3-21ksoftirqd/012:23:430
81750,0rcu_preempt3-21ksoftirqd/011:49:140
81750,0rcu_preempt19-21ksoftirqd/112:22:161
2315799753,0cyclictest0-21swapper/011:14:350
81740,0rcu_preempt3-21ksoftirqd/010:35:350
81730,0rcu_preempt3-21ksoftirqd/011:24:510
81730,0rcu_preempt3-21ksoftirqd/010:47:350
81730,0rcu_preempt3-21ksoftirqd/010:47:350
81730,0rcu_preempt3-21ksoftirqd/010:10:540
81730,0rcu_preempt3-21ksoftirqd/009:35:310
10050730,0irq/346-484840041ktimersoftd/010:19:260
81720,0rcu_preempt3-21ksoftirqd/010:19:010
81710,0rcu_preempt3-21ksoftirqd/012:34:020
81710,0rcu_preempt3-21ksoftirqd/011:44:180
81710,0rcu_preempt3-21ksoftirqd/011:44:180
81710,0rcu_preempt3-21ksoftirqd/011:24:140
81710,0rcu_preempt3-21ksoftirqd/011:24:140
81710,0rcu_preempt3-21ksoftirqd/009:51:450
81710,0rcu_preempt3-21ksoftirqd/009:46:270
81700,0rcu_preempt7996-21ssh10:24:401
81700,0rcu_preempt3-21ksoftirqd/012:38:430
81700,0rcu_preempt3-21ksoftirqd/012:38:430
81700,0rcu_preempt3-21ksoftirqd/011:53:520
81700,0rcu_preempt3-21ksoftirqd/009:19:060
2315799701,0cyclictest20026-21apt-get11:09:360
81690,0rcu_preempt3-21ksoftirqd/012:28:110
81690,0rcu_preempt3-21ksoftirqd/012:07:480
81690,0rcu_preempt3-21ksoftirqd/012:07:480
81690,0rcu_preempt3-21ksoftirqd/011:58:090
81690,0rcu_preempt3-21ksoftirqd/009:25:550
81690,0rcu_preempt3-21ksoftirqd/008:34:400
2315799692,0cyclictest26435-21ping07:19:360
81680,0rcu_preempt3-21ksoftirqd/011:07:510
81680,0rcu_preempt3-21ksoftirqd/010:58:170
81680,0rcu_preempt3-21ksoftirqd/010:08:290
81680,0rcu_preempt3-21ksoftirqd/009:59:550
81680,0rcu_preempt3-21ksoftirqd/009:54:540
81680,0rcu_preempt3-21ksoftirqd/007:49:410
81670,0rcu_preempt3-21ksoftirqd/011:35:590
81670,0rcu_preempt3-21ksoftirqd/011:02:590
81670,0rcu_preempt3-21ksoftirqd/011:02:590
81670,0rcu_preempt20917-21taskset08:39:480
81660,0rcu_preempt3-21ksoftirqd/008:09:340
81650,0rcu_preempt3-21ksoftirqd/011:32:250
81650,0rcu_preempt3-21ksoftirqd/011:32:250
81650,0rcu_preempt19-21ksoftirqd/111:05:011
2315799652,0cyclictest2533450munin-node0
81640,0rcu_preempt19-21ksoftirqd/109:18:061
81630,0rcu_preempt3-21ksoftirqd/012:09:340
81630,0rcu_preempt19-21ksoftirqd/112:30:441
81630,0rcu_preempt19-21ksoftirqd/108:29:411
81620,0rcu_preempt19-21ksoftirqd/110:23:521
10050620,0irq/346-484840029272-1kworker/1:0H11:53:101
10050620,0irq/346-484840025318-1kworker/1:0H09:38:141
10050620,0irq/346-484840012781-1kworker/1:2H11:17:471
81610,0rcu_preempt3-21ksoftirqd/008:19:440
81610,0rcu_preempt26741-21kworker/1:110:44:501
81610,0rcu_preempt26741-21kworker/1:110:44:501
81610,0rcu_preempt26116-1kworker/0:1H07:24:590
23157996112,0cyclictest17146-21apt-get08:29:340
81600,0rcu_preempt27594-21memory08:59:460
2315799602,0cyclictest26435-21ping07:44:340
10050600,0irq/346-484840016775-1kworker/1:1H12:11:151
81590,0rcu_preempt25563-21diskstats08:54:370
81590,0rcu_preempt23010-21kworker/0:107:54:460
2315799591,0cyclictest16702-21192.168.115.60-08:26:200
10050590,0irq/346-48484009244-1kworker/1:1H12:37:231
10050590,0irq/346-48484009244-1kworker/1:1H12:37:231
10050590,0irq/346-484840030284-1kworker/1:1H10:06:511
10050590,0irq/346-484840021953-1kworker/1:3H11:12:261
81580,0rcu_preempt23156-21cyclictest11:23:121
81580,0rcu_preempt23156-21cyclictest11:23:121
2315799573,0cyclictest0-21swapper/009:09:220
23157995710,0cyclictest1445-21runrttasks08:44:470
10050570,0irq/346-484840030255-1kworker/1:3H10:51:261
81560,0rcu_preempt19-21ksoftirqd/111:39:401
81560,0rcu_preempt19-21ksoftirqd/111:39:401
81560,0rcu_preempt19-21ksoftirqd/109:24:431
81560,0rcu_preempt19-21ksoftirqd/108:28:431
2315799562,0cyclictest0-21swapper/008:49:450
81550,0rcu_preempt19-21ksoftirqd/111:36:031
305462550,0chrt10050irq/346-484840007:29:590
81540,0rcu_preempt19-21ksoftirqd/111:30:291
81540,0rcu_preempt19-21ksoftirqd/111:30:291
81540,0rcu_preempt19-21ksoftirqd/108:14:401
81540,0rcu_preempt19-21ksoftirqd/108:11:371
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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