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2026-04-16 - 18:56

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 Thu Apr 16, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10050920,0irq/346-4848400111rcuc/010:33:580
81880,0rcu_preempt19-21ksoftirqd/110:28:471
81850,0rcu_preempt19-21ksoftirqd/109:26:381
81850,0rcu_preempt19-21ksoftirqd/109:26:381
81820,0rcu_preempt19-21ksoftirqd/107:57:291
81820,0rcu_preempt19-21ksoftirqd/107:57:291
81800,0rcu_preempt3-21ksoftirqd/011:38:540
81800,0rcu_preempt3-21ksoftirqd/011:38:540
81790,0rcu_preempt19-21ksoftirqd/109:13:471
81780,0rcu_preempt19-21ksoftirqd/109:34:551
81750,0rcu_preempt19-21ksoftirqd/110:38:531
81730,0rcu_preempt3-21ksoftirqd/010:14:280
81720,0rcu_preempt3-21ksoftirqd/012:23:570
81700,0rcu_preempt3-21ksoftirqd/010:11:330
81680,0rcu_preempt3-21ksoftirqd/011:43:360
9950670,0irq/345-48484000-21swapper/009:43:150
81670,0rcu_preempt19-21ksoftirqd/112:13:501
81670,0rcu_preempt19-21ksoftirqd/107:36:071
81650,0rcu_preempt3-21ksoftirqd/010:06:220
81620,0rcu_preempt851-21rngd10:25:060
81610,0rcu_preempt3-21ksoftirqd/007:58:390
81600,0rcu_preempt19-21ksoftirqd/111:47:331
81590,0rcu_preempt19-21ksoftirqd/111:20:191
81590,0rcu_preempt1889-21ping08:23:560
81580,0rcu_preempt3-21ksoftirqd/010:18:510
81580,0rcu_preempt3-21ksoftirqd/009:23:480
81580,0rcu_preempt3-21ksoftirqd/009:23:480
81580,0rcu_preempt3-21ksoftirqd/008:08:530
81570,0rcu_preempt19-21ksoftirqd/109:29:481
81560,0rcu_preempt3-21ksoftirqd/011:33:440
81560,0rcu_preempt19-21ksoftirqd/112:34:561
81560,0rcu_preempt19-21ksoftirqd/110:13:481
81560,0rcu_preempt19-21ksoftirqd/110:07:381
81560,0rcu_preempt10649-21dropbear08:23:431
81560,0rcu_preempt0-21swapper/109:18:561
81550,0rcu_preempt19-21ksoftirqd/111:59:481
81550,0rcu_preempt19-21ksoftirqd/110:55:091
10050550,0irq/346-48484003-21ksoftirqd/009:17:230
10050550,0irq/346-484840030910-21apt-get11:58:400
10050550,0irq/346-48484000-21swapper/011:23:240
81540,0rcu_preempt3-21ksoftirqd/011:03:460
81540,0rcu_preempt3-21ksoftirqd/008:33:410
81540,0rcu_preempt30336-21ssh09:46:120
81540,0rcu_preempt19-21ksoftirqd/111:38:491
81540,0rcu_preempt19-21ksoftirqd/111:38:491
81540,0rcu_preempt15542-21kworker/0:211:23:390
81520,0rcu_preempt3-21ksoftirqd/012:18:550
81520,0rcu_preempt3-21ksoftirqd/011:53:490
81520,0rcu_preempt3-21ksoftirqd/011:08:560
81520,0rcu_preempt3-21ksoftirqd/009:53:480
81520,0rcu_preempt3-21ksoftirqd/009:18:520
81520,0rcu_preempt1889-21ping08:01:121
309782520,0chrt10050irq/346-484840007:45:510
81510,0rcu_preempt3-21ksoftirqd/012:33:570
81510,0rcu_preempt3-21ksoftirqd/012:32:030
81510,0rcu_preempt3-21ksoftirqd/012:11:490
81510,0rcu_preempt3-21ksoftirqd/010:58:580
81510,0rcu_preempt3-21ksoftirqd/010:28:560
81510,0rcu_preempt3-21ksoftirqd/008:18:410
81510,0rcu_preempt19-21ksoftirqd/111:08:511
81510,0rcu_preempt19-21ksoftirqd/110:58:571
10050510,0irq/346-48484001404-21ssh10:55:130
10050510,0irq/346-48484000-21swapper/012:07:250
10050510,0irq/346-48484000-21swapper/009:33:190
81500,0rcu_preempt9382-1kworker/0:1H10:43:570
81500,0rcu_preempt3-21ksoftirqd/011:50:220
81500,0rcu_preempt3-21ksoftirqd/011:17:040
81500,0rcu_preempt3-21ksoftirqd/009:48:530
81500,0rcu_preempt3-21ksoftirqd/008:43:460
81500,0rcu_preempt3-21ksoftirqd/007:53:410
81500,0rcu_preempt3-21ksoftirqd/007:53:410
81500,0rcu_preempt27813-21if_err_eth009:43:471
81500,0rcu_preempt19330-21grep08:48:520
81500,0rcu_preempt19-21ksoftirqd/112:23:451
81500,0rcu_preempt19-21ksoftirqd/110:43:411
81500,0rcu_preempt19-21ksoftirqd/108:18:551
10050500,0irq/346-484840027613-1kworker/0:2H09:12:550
81490,0rcu_preempt3-21ksoftirqd/010:48:410
81490,0rcu_preempt3-21ksoftirqd/009:34:390
81490,0rcu_preempt3-21ksoftirqd/008:13:530
81490,0rcu_preempt3-21ksoftirqd/008:03:420
81490,0rcu_preempt3-21ksoftirqd/007:48:490
81490,0rcu_preempt19-21ksoftirqd/112:30:351
10050490,0irq/346-48484003765-1kworker/0:2H11:31:040
10050490,0irq/346-48484003765-1kworker/0:2H11:31:040
81480,0rcu_preempt4429-21kworker/1:009:11:491
81480,0rcu_preempt3-21ksoftirqd/010:38:570
81480,0rcu_preempt3-21ksoftirqd/009:59:350
81480,0rcu_preempt3-21ksoftirqd/008:43:290
81480,0rcu_preempt3-21ksoftirqd/008:28:420
10050480,0irq/346-48484000-21swapper/012:14:010
81470,0rcu_preempt3-21ksoftirqd/007:24:020
81470,0rcu_preempt3-21ksoftirqd/007:24:020
81470,0rcu_preempt3-21ksoftirqd/007:06:030
81470,0rcu_preempt19-21ksoftirqd/111:28:411
81470,0rcu_preempt19-21ksoftirqd/111:28:411
81470,0rcu_preempt19-21ksoftirqd/111:06:481
81470,0rcu_preempt19-21ksoftirqd/107:03:461
10050470,0irq/346-484840024342-1kworker/0:0H07:28:400
81460,0rcu_preempt54-21kswapd010:11:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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