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2026-04-15 - 22:37

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 highest latencies:
System rackaslot5s.osadl.org (updated Wed Apr 15, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811060,0rcu_preempt3-21ksoftirqd/012:33:450
811060,0rcu_preempt3-21ksoftirqd/011:56:440
811060,0rcu_preempt3-21ksoftirqd/011:56:440
811020,0rcu_preempt3-21ksoftirqd/012:10:430
81990,0rcu_preempt3-21ksoftirqd/010:23:460
185832970,0sleep09950irq/345-484840007:31:030
81940,0rcu_preempt3-21ksoftirqd/010:00:200
301162910,0chrt10050irq/346-484840008:06:350
81760,0rcu_preempt3-21ksoftirqd/011:53:080
81730,0rcu_preempt3-21ksoftirqd/011:18:510
81730,0rcu_preempt3-21ksoftirqd/011:18:510
81730,0rcu_preempt3-21ksoftirqd/010:52:460
81690,0rcu_preempt3-21ksoftirqd/010:44:540
81670,0rcu_preempt54-21kswapd008:43:510
81660,0rcu_preempt6930-21munin-node0
81660,0rcu_preempt3-21ksoftirqd/008:28:300
81640,0rcu_preempt8402-21taskset10:38:160
81640,0rcu_preempt3-21ksoftirqd/009:13:180
81640,0rcu_preempt19-21ksoftirqd/109:48:461
10050640,0irq/346-484840054-21kswapd009:23:320
81630,0rcu_preempt3-21ksoftirqd/007:12:280
10050630,0irq/346-484840024077-1kworker/1:1H10:23:101
10050630,0irq/346-484840017672-1kworker/1:0H11:22:311
10050630,0irq/346-484840017672-1kworker/1:0H11:22:311
10050630,0irq/346-484840010618-21cyclictest10:50:071
81620,0rcu_preempt28218-21kworker/0:011:28:560
10050620,0irq/346-484840022781-21ssh12:33:441
81610,0rcu_preempt3-21ksoftirqd/011:08:420
81610,0rcu_preempt3-21ksoftirqd/011:08:420
81610,0rcu_preempt3-21ksoftirqd/007:58:440
81610,0rcu_preempt3-21ksoftirqd/007:43:560
10050610,0irq/346-484840025101-1kworker/1:0H09:21:161
10050610,0irq/346-484840019158-1kworker/1:3H10:16:371
10050600,0irq/346-484840054-21kswapd010:44:551
10050600,0irq/346-484840032202-1kworker/1:0H11:36:391
9950590,0irq/345-484840020678-21ssh11:23:511
81590,0rcu_preempt3-21ksoftirqd/010:08:540
10050590,0irq/346-48484007505-1kworker/1:0H09:39:121
10050590,0irq/346-484840054-21kswapd011:51:491
10050590,0irq/346-484840027358-1kworker/1:2H11:30:471
10050590,0irq/346-484840019629-1kworker/0:1H12:30:100
10050590,0irq/346-484840017344-1kworker/1:2H09:44:331
10050590,0irq/346-48484000-21swapper/111:13:051
10050590,0irq/346-48484000-21swapper/111:13:051
9950580,0irq/345-48484001062099cyclictest12:13:391
81580,0rcu_preempt3-21ksoftirqd/008:38:490
10050580,0irq/346-48484001453-1kworker/1:0H10:33:331
81570,0rcu_preempt6259-21apt-get08:33:400
81570,0rcu_preempt5246-1kworker/0:2H12:16:520
81570,0rcu_preempt3-21ksoftirqd/010:28:420
81570,0rcu_preempt3-21ksoftirqd/009:48:410
10050570,0irq/346-484840021101-1kworker/0:1H10:55:030
10050570,0irq/346-484840014287-1kworker/1:1H11:54:281
10050570,0irq/346-484840014287-1kworker/1:1H11:54:281
10050570,0irq/346-484840011295-1kworker/1:1H10:41:371
81560,0rcu_preempt4409-21ssh10:00:181
81560,0rcu_preempt3-21ksoftirqd/008:53:540
81560,0rcu_preempt3-21ksoftirqd/007:53:550
81560,0rcu_preempt19-21ksoftirqd/110:03:461
10050560,0irq/346-48484000-21swapper/110:13:281
81550,0rcu_preempt8240-21apt-get12:18:410
81550,0rcu_preempt3-21ksoftirqd/012:25:420
81550,0rcu_preempt3-21ksoftirqd/009:54:020
81550,0rcu_preempt3-21ksoftirqd/008:58:450
81550,0rcu_preempt3-21ksoftirqd/007:48:440
81550,0rcu_preempt31689-21kworker/0:108:13:430
81550,0rcu_preempt15002-21kworker/u4:210:16:570
10619995514,0cyclictest0-21swapper/011:03:510
10050550,0irq/346-484840028758-1kworker/1:1H12:09:071
10050550,0irq/346-484840025994-1kworker/1:3H10:59:481
10050550,0irq/346-484840014248-1kworker/1:0H10:23:441
81540,0rcu_preempt3861-21kworker/0:209:28:410
81540,0rcu_preempt3-21ksoftirqd/012:03:560
81540,0rcu_preempt3-21ksoftirqd/011:58:560
81540,0rcu_preempt3-21ksoftirqd/011:35:390
81540,0rcu_preempt3-21ksoftirqd/010:19:440
81540,0rcu_preempt3-21ksoftirqd/008:23:450
10050540,0irq/346-48484009854-21ssh11:46:151
10050540,0irq/346-48484007505-1kworker/1:0H09:37:111
10050540,0irq/346-484840054-21kswapd011:17:381
10050540,0irq/346-484840054-21kswapd011:03:020
10050540,0irq/346-484840023929-1kworker/1:2H12:04:011
10050540,0irq/346-484840019630-1kworker/1:0H12:33:171
10050540,0irq/346-484840015674-1kworker/1:3H09:09:221
81530,0rcu_preempt3327-21head11:38:590
81530,0rcu_preempt3-21ksoftirqd/011:23:590
81530,0rcu_preempt3-21ksoftirqd/009:38:480
81530,0rcu_preempt3-21ksoftirqd/009:33:470
81530,0rcu_preempt3-21ksoftirqd/007:13:520
81530,0rcu_preempt12293-21kworker/0:109:43:520
10050530,0irq/346-48484005976-1kworker/1:1H12:20:151
10050530,0irq/346-484840054-21kswapd010:32:351
10050530,0irq/346-484840025994-1kworker/1:3H10:58:061
10050530,0irq/346-48484000-21swapper/109:55:021
81520,0rcu_preempt3-21ksoftirqd/011:13:450
81520,0rcu_preempt3-21ksoftirqd/009:18:410
10050520,0irq/346-48484003191-1kworker/1:1H11:07:231
81510,0rcu_preempt3-21ksoftirqd/009:14:090
10050510,0irq/346-48484004640-1kworker/1:1H11:42:451
10050510,0irq/346-48484000-21swapper/107:28:411
9950500,0irq/345-484840014866-1kworker/1:3H12:24:521
81500,0rcu_preempt3-21ksoftirqd/009:03:550
81500,0rcu_preempt3-21ksoftirqd/008:09:210
10050500,0irq/346-48484006893-21ssh09:29:331
10050500,0irq/346-484840054-21kswapd010:05:460
9950490,0irq/345-48484009324-21entropy07:03:440
81490,0rcu_preempt3-21ksoftirqd/010:38:560
81490,0rcu_preempt19-21ksoftirqd/108:53:471
10050490,0irq/346-484840054-21kswapd008:20:100
10050480,0irq/346-484840019095-1kworker/1:0H11:59:231
81470,0rcu_preempt3-21ksoftirqd/008:48:410
10050470,0irq/346-484840013902-21ping07:42:031
9950450,0irq/345-48484000-21swapper/109:27:451
81450,0rcu_preempt19-21ksoftirqd/107:17:291
10050450,0irq/346-484840020160-1kworker/1:1H09:13:581
10050450,0irq/346-484840013902-21ping07:23:531
10050450,0irq/346-484840013902-21ping07:21:451
10050450,0irq/346-484840011914-1kworker/1:1H07:10:271
10619994413,0cyclictest0-21swapper/007:22:350
10619994412,0cyclictest13902-21ping07:39:040
10619994316,0cyclictest13902-21ping07:23:420
81420,0rcu_preempt19-21ksoftirqd/107:03:531
81410,0rcu_preempt13902-21ping07:34:020
81400,0rcu_preempt19-21ksoftirqd/107:43:561
81400,0rcu_preempt13902-21ping07:35:461
10050400,0irq/346-484840019-21ksoftirqd/108:08:481
81390,0rcu_preempt10159-21missed_timers08:43:521
81380,0rcu_preempt19-21ksoftirqd/108:48:551
81380,0rcu_preempt19-21ksoftirqd/108:37:361
81380,0rcu_preempt19-21ksoftirqd/108:23:441
81380,0rcu_preempt19-21ksoftirqd/108:04:001
81380,0rcu_preempt19-21ksoftirqd/108:03:301
81370,0rcu_preempt19-21ksoftirqd/107:48:431
81360,0rcu_preempt19-21ksoftirqd/108:38:531
320802350,0sleep126691-1kworker/1:1H08:13:341
10050350,0irq/346-48484000-21swapper/108:28:451
81340,0rcu_preempt19-21ksoftirqd/108:58:401
81340,0rcu_preempt19-21ksoftirqd/107:53:581
10050340,0irq/346-48484000-21swapper/109:03:331
9950320,0irq/345-48484000-21swapper/108:19:451
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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