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2026-04-20 - 05:11

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 Mon Apr 20, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10050970,0irq/346-484840028275-1kworker/1:0H22:16:581
10050970,0irq/346-484840028275-1kworker/1:0H22:16:581
81930,0rcu_preempt3-21ksoftirqd/021:43:380
9950800,0irq/345-4848400181ktimersoftd/123:04:191
81780,0rcu_preempt3-21ksoftirqd/023:52:020
81710,0rcu_preempt3-21ksoftirqd/000:33:490
81700,0rcu_preempt54-21kswapd023:46:550
81670,0rcu_preempt31237-1kworker/0:2H19:34:010
81670,0rcu_preempt19-21ksoftirqd/123:18:521
81660,0rcu_preempt54-21kswapd020:01:040
81650,0rcu_preempt54-21kswapd020:13:260
81650,0rcu_preempt19-21ksoftirqd/121:38:381
81630,0rcu_preempt3-21ksoftirqd/023:13:160
81630,0rcu_preempt19-21ksoftirqd/120:23:471
81620,0rcu_preempt19-21ksoftirqd/121:11:251
10050620,0irq/346-484840020858-21ssh23:39:491
81610,0rcu_preempt19-21ksoftirqd/123:26:441
81610,0rcu_preempt19-21ksoftirqd/100:32:301
81600,0rcu_preempt19-21ksoftirqd/123:17:571
81600,0rcu_preempt19-21ksoftirqd/122:29:571
81600,0rcu_preempt19-21ksoftirqd/100:08:421
10050600,0irq/346-484840054-21kswapd000:13:421
9950590,0irq/345-484840081rcu_preempt21:48:261
81590,0rcu_preempt19-21ksoftirqd/100:24:531
81590,0rcu_preempt19-21ksoftirqd/100:21:471
81590,0rcu_preempt19-21ksoftirqd/100:21:471
10050590,0irq/346-484840094182sleep100:01:111
10050590,0irq/346-48484008190-1kworker/1:1H21:53:081
10050590,0irq/346-484840023232-21ssh22:05:131
81580,0rcu_preempt3-21ksoftirqd/022:15:060
81580,0rcu_preempt3-21ksoftirqd/022:15:060
81580,0rcu_preempt19-21ksoftirqd/122:47:421
81580,0rcu_preempt19-21ksoftirqd/122:24:441
81570,0rcu_preempt19-21ksoftirqd/123:43:491
81570,0rcu_preempt19-21ksoftirqd/121:53:431
9950560,0irq/345-484840054-21kswapd000:33:391
9950560,0irq/345-484840025105-1kworker/1:1H21:28:511
81560,0rcu_preempt3-21ksoftirqd/020:53:440
81560,0rcu_preempt3-21ksoftirqd/020:38:430
81560,0rcu_preempt3-21ksoftirqd/020:28:380
81560,0rcu_preempt3-21ksoftirqd/020:28:380
81560,0rcu_preempt23386-21cyclictest23:33:490
81560,0rcu_preempt0-21swapper/121:18:111
81550,0rcu_preempt3-21ksoftirqd/022:54:340
81550,0rcu_preempt3-21ksoftirqd/021:03:430
10050550,0irq/346-484840011246-21ssh22:58:331
81540,0rcu_preempt3-21ksoftirqd/021:58:460
81540,0rcu_preempt3-21ksoftirqd/021:33:380
81540,0rcu_preempt3-21ksoftirqd/020:58:510
81540,0rcu_preempt19-21ksoftirqd/121:27:271
81540,0rcu_preempt19-21ksoftirqd/121:27:271
81540,0rcu_preempt19-21ksoftirqd/121:19:391
81530,0rcu_preempt7171-21ping20:18:450
81530,0rcu_preempt3-21ksoftirqd/023:58:520
81530,0rcu_preempt3-21ksoftirqd/023:13:420
81530,0rcu_preempt3-21ksoftirqd/022:43:380
81530,0rcu_preempt3-21ksoftirqd/022:20:590
81530,0rcu_preempt3-21ksoftirqd/022:08:460
81530,0rcu_preempt3-21ksoftirqd/000:28:460
10050530,0irq/346-4848400851-21rngd00:08:490
10050530,0irq/346-48484001324-21ssh23:53:260
9950520,0irq/345-484840020744-1kworker/1:1H22:20:561
9950520,0irq/345-4848400171rcuc/122:42:571
81520,0rcu_preempt3-21ksoftirqd/023:28:380
81520,0rcu_preempt3-21ksoftirqd/022:48:470
81520,0rcu_preempt3-21ksoftirqd/022:03:510
81520,0rcu_preempt3-21ksoftirqd/021:31:060
81520,0rcu_preempt10993-21ssh21:53:380
10050520,0irq/346-484840054-21kswapd022:02:111
9950510,0irq/345-484840025552-1kworker/1:3H21:36:161
9950510,0irq/345-484840019037-21ssh22:33:440
9950510,0irq/345-484840015588-1kworker/1:1H23:34:401
9950510,0irq/345-48484000-21swapper/022:42:320
81510,0rcu_preempt7171-21ping20:13:450
81510,0rcu_preempt5883-21apt-get19:53:380
81510,0rcu_preempt3-21ksoftirqd/022:28:530
81510,0rcu_preempt3-21ksoftirqd/021:38:430
81510,0rcu_preempt3-21ksoftirqd/021:23:470
81510,0rcu_preempt3-21ksoftirqd/021:23:470
81510,0rcu_preempt3-21ksoftirqd/021:13:480
81510,0rcu_preempt3-21ksoftirqd/019:48:410
81510,0rcu_preempt3-21ksoftirqd/019:13:470
81510,0rcu_preempt3-21ksoftirqd/019:08:490
81510,0rcu_preempt3-21ksoftirqd/000:23:510
81510,0rcu_preempt19-21ksoftirqd/122:50:011
9950500,0irq/345-48484000-21swapper/023:05:000
81500,0rcu_preempt3-21ksoftirqd/023:38:440
81500,0rcu_preempt3-21ksoftirqd/023:23:480
81500,0rcu_preempt3-21ksoftirqd/023:18:460
81500,0rcu_preempt3-21ksoftirqd/023:01:420
81500,0rcu_preempt3-21ksoftirqd/020:43:370
81500,0rcu_preempt3-21ksoftirqd/020:28:000
81500,0rcu_preempt3-21ksoftirqd/019:03:430
81500,0rcu_preempt3-21ksoftirqd/000:13:540
81500,0rcu_preempt3-21ksoftirqd/000:08:260
81500,0rcu_preempt19-21ksoftirqd/120:17:251
9950490,0irq/345-48484008632-1kworker/1:2H22:58:171
9950490,0irq/345-48484003356-1kworker/1:2H22:36:011
81490,0rcu_preempt3-21ksoftirqd/021:48:380
81490,0rcu_preempt3-21ksoftirqd/020:03:560
81490,0rcu_preempt3-21ksoftirqd/000:18:500
81490,0rcu_preempt3-21ksoftirqd/000:18:500
81490,0rcu_preempt19-21ksoftirqd/120:18:441
10050490,0irq/346-4848400171rcuc/123:31:071
9950480,0irq/345-484840025552-1kworker/1:3H22:09:141
81480,0rcu_preempt8916-21ssh22:23:420
81480,0rcu_preempt19-21ksoftirqd/119:38:271
81480,0rcu_preempt19209-21df_inode20:33:420
81480,0rcu_preempt1672-21kworker/0:221:12:180
10050480,0irq/346-48484003-21ksoftirqd/019:38:500
10050480,0irq/346-4848400181ktimersoftd/100:06:291
9950470,0irq/345-48484003164-1kworker/1:0H23:55:361
9950470,0irq/345-484840030373-21basename21:08:251
9950470,0irq/345-48484000-21swapper/021:18:460
81470,0rcu_preempt3-21ksoftirqd/020:48:430
81470,0rcu_preempt26407-1kworker/0:0H19:23:400
81450,0rcu_preempt3-21ksoftirqd/019:43:500
81450,0rcu_preempt3-21ksoftirqd/019:43:500
81450,0rcu_preempt28469-21apt-get19:23:381
81450,0rcu_preempt19-21ksoftirqd/119:33:491
2338799452,0cyclictest26665-21ping19:28:460
10050450,0irq/346-48484000-21swapper/119:19:481
81440,0rcu_preempt19-21ksoftirqd/120:08:421
81440,0rcu_preempt19-21ksoftirqd/120:03:161
81430,0rcu_preempt19-21ksoftirqd/123:48:371
81430,0rcu_preempt14044-21kworker/0:219:23:240
81420,0rcu_preempt19-21ksoftirqd/123:10:551
81420,0rcu_preempt19-21ksoftirqd/119:43:501
81420,0rcu_preempt19-21ksoftirqd/119:43:501
81410,0rcu_preempt19-21ksoftirqd/119:29:051
81400,0rcu_preempt19-21ksoftirqd/120:43:511
81400,0rcu_preempt19-21ksoftirqd/120:03:461
81400,0rcu_preempt19-21ksoftirqd/119:53:381
81380,0rcu_preempt19-21ksoftirqd/119:07:311
81360,0rcu_preempt19-21ksoftirqd/120:53:471
81360,0rcu_preempt19013-21apt-get20:33:381
81350,0rcu_preempt19-21ksoftirqd/119:17:311
10050350,0irq/346-48484002213-1kworker/1:1H19:48:491
81340,0rcu_preempt23361-1kworker/1:1H19:11:321
81340,0rcu_preempt19-21ksoftirqd/121:03:171
81340,0rcu_preempt19-21ksoftirqd/120:38:481
188222340,0chrt13955-1kworker/1:2H20:33:081
188222340,0chrt13955-1kworker/1:2H20:33:081
9950300,0irq/345-48484000-21swapper/120:48:511
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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