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2026-04-12 - 08:05

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 Sun Apr 12, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81700,0rcu_preempt3-21ksoftirqd/020:14:070
81680,0rcu_preempt16087-1kworker/0:3H23:58:580
81660,0rcu_preempt3-21ksoftirqd/000:24:030
10050610,0irq/346-484840054-21kswapd021:58:440
10050610,0irq/346-484840054-21kswapd021:58:440
10050590,0irq/346-48484003-21ksoftirqd/021:12:360
81580,0rcu_preempt3-21ksoftirqd/023:23:470
10050560,0irq/346-484840054-21kswapd000:17:110
81550,0rcu_preempt3-21ksoftirqd/023:39:000
81530,0rcu_preempt3-21ksoftirqd/022:09:010
81530,0rcu_preempt3-21ksoftirqd/022:09:010
81530,0rcu_preempt3-21ksoftirqd/021:33:450
10050530,0irq/346-484840054-21kswapd022:56:170
10050530,0irq/346-484840021451-1kworker/0:0H22:58:400
10050520,0irq/346-484840054-21kswapd022:47:580
10050520,0irq/346-484840019151-1kworker/0:2H22:20:120
81510,0rcu_preempt3-21ksoftirqd/023:48:510
10050510,0irq/346-484840054-21kswapd000:36:250
10050510,0irq/346-484840026224-21ssh21:21:570
9950500,0irq/345-48484003-21ksoftirqd/020:00:460
81500,0rcu_preempt3-21ksoftirqd/020:22:450
10050500,0irq/346-48484006590-21rm23:45:530
10050500,0irq/346-48484006118-21apt-get00:18:430
10050500,0irq/346-484840054-21kswapd023:56:180
10050500,0irq/346-484840054-21kswapd023:30:440
10050500,0irq/346-484840054-21kswapd021:49:540
10050500,0irq/346-484840054-21kswapd021:25:110
10050500,0irq/346-484840054-21kswapd000:09:050
10050500,0irq/346-484840031363-1kworker/0:0H23:08:350
10050500,0irq/346-484840024803-21apt-get21:53:440
9950490,0irq/345-4848400851-21rngd22:29:570
9950490,0irq/345-4848400851-21rngd21:16:510
81490,0rcu_preempt3-21ksoftirqd/021:03:340
10050490,0irq/346-48484009231-1kworker/0:0H22:25:080
10050490,0irq/346-484840054-21kswapd000:06:340
10050490,0irq/346-484840031960-21munin-node0
10050490,0irq/346-484840016000-21apt-get00:28:460
10050490,0irq/346-4848400111rcuc/022:52:580
10050480,0irq/346-48484008895-21ping19:43:590
10050480,0irq/346-48484000-21swapper/023:21:450
10050480,0irq/346-48484000-21swapper/023:13:570
10050480,0irq/346-48484000-21swapper/023:13:570
81470,0rcu_preempt404-21df_abs21:28:480
81470,0rcu_preempt3-21ksoftirqd/020:58:560
81470,0rcu_preempt3-21ksoftirqd/020:09:080
10050470,0irq/346-484840027807-21ssh23:34:100
10050470,0irq/346-48484002235-21ssh22:03:420
81460,0rcu_preempt3-21ksoftirqd/022:38:390
81460,0rcu_preempt21809-21ping19:56:560
10050460,0irq/346-484840016089-21ssh22:17:390
10050460,0irq/346-48484000-21swapper/021:39:490
81450,0rcu_preempt8895-21ping19:38:530
81450,0rcu_preempt4559-21munin-node0
81450,0rcu_preempt3-21ksoftirqd/020:53:570
81450,0rcu_preempt3-21ksoftirqd/020:06:410
10050450,0irq/346-484840031363-1kworker/0:0H23:05:160
81440,0rcu_preempt3-21ksoftirqd/020:38:590
81440,0rcu_preempt3-21ksoftirqd/020:23:550
81440,0rcu_preempt3-21ksoftirqd/019:33:470
81440,0rcu_preempt3-21ksoftirqd/019:33:470
81440,0rcu_preempt23747-1kworker/1:1H23:39:171
10050440,0irq/346-484840028231-1kworker/0:2H20:38:330
81430,0rcu_preempt3-21ksoftirqd/020:48:530
81430,0rcu_preempt3-21ksoftirqd/019:48:560
10050430,0irq/346-48484008913-21runrttasks19:18:330
10050430,0irq/346-48484008895-21ping19:27:400
10050430,0irq/346-484840018986-21ssh21:47:440
81420,0rcu_preempt30940-1kworker/1:1H00:13:571
81420,0rcu_preempt19-21ksoftirqd/122:28:571
81410,0rcu_preempt3-21ksoftirqd/019:28:580
81410,0rcu_preempt19-21ksoftirqd/123:23:471
81410,0rcu_preempt19-21ksoftirqd/120:17:361
10050410,0irq/346-484840041ktimersoftd/019:08:430
81400,0rcu_preempt3-21ksoftirqd/020:28:350
81400,0rcu_preempt3-21ksoftirqd/020:28:350
81400,0rcu_preempt19-21ksoftirqd/120:07:401
81400,0rcu_preempt19-21ksoftirqd/119:57:331
81390,0rcu_preempt3-21ksoftirqd/019:18:500
81390,0rcu_preempt19-21ksoftirqd/121:36:131
81390,0rcu_preempt19-21ksoftirqd/119:03:371
81380,0rcu_preempt3574-21kworker/0:219:03:440
81380,0rcu_preempt19-21ksoftirqd/123:46:361
81380,0rcu_preempt19-21ksoftirqd/120:36:221
81380,0rcu_preempt19-21ksoftirqd/120:31:201
81380,0rcu_preempt19-21ksoftirqd/120:31:201
81380,0rcu_preempt19-21ksoftirqd/119:59:101
81380,0rcu_preempt19-21ksoftirqd/119:21:571
10050380,0irq/346-484840021717-21cpu23:28:461
81370,0rcu_preempt19-21ksoftirqd/123:55:041
81370,0rcu_preempt19-21ksoftirqd/123:53:081
81370,0rcu_preempt19-21ksoftirqd/123:37:161
81370,0rcu_preempt19-21ksoftirqd/123:21:591
81370,0rcu_preempt19-21ksoftirqd/123:09:021
81370,0rcu_preempt19-21ksoftirqd/122:47:241
81370,0rcu_preempt19-21ksoftirqd/122:42:141
81370,0rcu_preempt19-21ksoftirqd/122:00:351
81370,0rcu_preempt19-21ksoftirqd/122:00:351
81370,0rcu_preempt19-21ksoftirqd/121:56:451
81370,0rcu_preempt19-21ksoftirqd/121:42:021
81370,0rcu_preempt19-21ksoftirqd/121:28:481
81370,0rcu_preempt19-21ksoftirqd/121:25:011
81370,0rcu_preempt19-21ksoftirqd/121:18:331
81370,0rcu_preempt19-21ksoftirqd/121:09:261
81370,0rcu_preempt19-21ksoftirqd/100:31:521
81370,0rcu_preempt19-21ksoftirqd/100:10:271
81360,0rcu_preempt19-21ksoftirqd/123:02:391
81360,0rcu_preempt19-21ksoftirqd/122:48:461
81360,0rcu_preempt19-21ksoftirqd/122:35:151
81360,0rcu_preempt19-21ksoftirqd/121:49:471
81360,0rcu_preempt19-21ksoftirqd/121:45:521
81360,0rcu_preempt19-21ksoftirqd/121:22:421
81360,0rcu_preempt19-21ksoftirqd/121:06:481
81360,0rcu_preempt19-21ksoftirqd/120:46:561
81360,0rcu_preempt19-21ksoftirqd/120:26:521
81360,0rcu_preempt19-21ksoftirqd/120:12:171
81360,0rcu_preempt19-21ksoftirqd/119:16:121
81360,0rcu_preempt19-21ksoftirqd/119:10:531
81360,0rcu_preempt19-21ksoftirqd/100:03:091
1699360,0migration/117701-21latency22:18:541
1699360,0migration/111562-21diskmemload00:23:541
10050360,0irq/346-4848400880-21ssh23:07:491
81350,0rcu_preempt19-21ksoftirqd/122:57:481
81350,0rcu_preempt19-21ksoftirqd/122:09:451
81350,0rcu_preempt19-21ksoftirqd/122:09:451
81350,0rcu_preempt19-21ksoftirqd/122:04:121
81350,0rcu_preempt19-21ksoftirqd/120:58:381
81350,0rcu_preempt19-21ksoftirqd/120:49:131
81350,0rcu_preempt19-21ksoftirqd/120:43:001
81350,0rcu_preempt19-21ksoftirqd/119:50:501
81350,0rcu_preempt19-21ksoftirqd/119:43:341
81350,0rcu_preempt19-21ksoftirqd/100:38:151
81350,0rcu_preempt19-21ksoftirqd/100:21:541
81350,0rcu_preempt19-21ksoftirqd/100:04:201
10050350,0irq/346-48484009230-1kworker/1:2H22:13:521
10050350,0irq/346-484840021450-1kworker/1:1H23:14:071
10050350,0irq/346-484840021450-1kworker/1:1H23:14:071
81340,0rcu_preempt54-21kswapd019:30:171
81340,0rcu_preempt19-21ksoftirqd/120:54:151
81340,0rcu_preempt19-21ksoftirqd/119:47:211
10050340,0irq/346-484840022994-21ssh22:23:581
81330,0rcu_preempt54-21kswapd019:25:361
81320,0rcu_preempt19-21ksoftirqd/119:33:551
81320,0rcu_preempt19-21ksoftirqd/119:33:551
10050310,0irq/346-484840030228-21sshd20:23:261
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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