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2026-05-25 - 14:21

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 May 25, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81830,0rcu_preempt0-21swapper/100:35:331
10050730,0irq/346-4848400833-1kworker/0:2H21:19:240
10050710,0irq/346-484840017149-1kworker/0:1H00:20:020
81700,0rcu_preempt19-21ksoftirqd/122:44:531
81690,0rcu_preempt19-21ksoftirqd/120:08:441
10050680,0irq/346-484840015721-1kworker/0:2H21:31:240
10050670,0irq/346-48484002343-1kworker/0:2H00:04:300
81660,0rcu_preempt19-21ksoftirqd/120:02:081
107672660,0chrt10050irq/346-484840020:19:170
10050660,0irq/346-484840012620-1kworker/0:0H23:07:530
81640,0rcu_preempt54-21kswapd021:27:091
81640,0rcu_preempt3-21ksoftirqd/022:05:160
81630,0rcu_preempt19-21ksoftirqd/120:03:051
81630,0rcu_preempt19-21ksoftirqd/119:13:021
10050630,0irq/346-484840023305-1kworker/0:2H23:19:560
81610,0rcu_preempt19-21ksoftirqd/122:23:121
81610,0rcu_preempt19-21ksoftirqd/122:18:031
81610,0rcu_preempt19-21ksoftirqd/122:10:591
81610,0rcu_preempt19-21ksoftirqd/121:09:351
81610,0rcu_preempt19-21ksoftirqd/119:57:391
10050610,0irq/346-484840054-21kswapd000:08:350
81600,0rcu_preempt19-21ksoftirqd/123:48:021
81600,0rcu_preempt19-21ksoftirqd/120:15:341
81600,0rcu_preempt19-21ksoftirqd/120:15:341
81600,0rcu_preempt15607-21kworker/1:122:56:381
81600,0rcu_preempt15607-21kworker/1:122:56:381
10050600,0irq/346-484840054-21kswapd000:13:581
81590,0rcu_preempt54-21kswapd023:22:381
81590,0rcu_preempt3377-21runrttasks23:28:171
81590,0rcu_preempt19-21ksoftirqd/123:38:191
81580,0rcu_preempt54-21kswapd021:51:111
81580,0rcu_preempt3-21ksoftirqd/021:50:430
81580,0rcu_preempt3-21ksoftirqd/020:53:100
81580,0rcu_preempt19-21ksoftirqd/123:53:171
81580,0rcu_preempt19-21ksoftirqd/121:28:171
81580,0rcu_preempt19-21ksoftirqd/120:18:511
81570,0rcu_preempt5548-21df22:58:081
81570,0rcu_preempt19-21ksoftirqd/123:43:191
81570,0rcu_preempt19-21ksoftirqd/122:33:111
81570,0rcu_preempt19-21ksoftirqd/120:29:511
81570,0rcu_preempt19-21ksoftirqd/120:26:491
81570,0rcu_preempt19-21ksoftirqd/120:26:491
81560,0rcu_preempt3-21ksoftirqd/023:46:500
81560,0rcu_preempt3-21ksoftirqd/022:29:300
81560,0rcu_preempt3-21ksoftirqd/000:26:110
81560,0rcu_preempt3-21ksoftirqd/000:26:110
81560,0rcu_preempt19-21ksoftirqd/123:23:031
81550,0rcu_preempt54-21kswapd023:14:530
81550,0rcu_preempt3-21ksoftirqd/020:13:230
81550,0rcu_preempt3-21ksoftirqd/020:13:230
81550,0rcu_preempt25894-21diskmemload00:27:151
81550,0rcu_preempt25894-21diskmemload00:27:151
81550,0rcu_preempt19-21ksoftirqd/121:38:111
81550,0rcu_preempt19-21ksoftirqd/120:48:161
81550,0rcu_preempt19-21ksoftirqd/100:28:201
81550,0rcu_preempt0-21swapper/123:08:251
81540,0rcu_preempt3-21ksoftirqd/022:09:500
81540,0rcu_preempt31851-21ssh22:52:071
81540,0rcu_preempt25894-21diskmemload23:33:241
81540,0rcu_preempt25894-21diskmemload23:14:031
81540,0rcu_preempt25894-21diskmemload00:07:351
81540,0rcu_preempt19-21ksoftirqd/120:36:321
81540,0rcu_preempt19-21ksoftirqd/119:48:051
81540,0rcu_preempt19-21ksoftirqd/100:18:051
81530,0rcu_preempt19-21ksoftirqd/121:58:121
81530,0rcu_preempt10348-1kworker/dying22:39:481
81530,0rcu_preempt0-21swapper/122:30:071
81530,0rcu_preempt0-21swapper/121:34:041
81530,0rcu_preempt0-21swapper/121:17:201
81520,0rcu_preempt3-21ksoftirqd/019:58:020
81520,0rcu_preempt25894-21diskmemload23:59:071
81520,0rcu_preempt19-21ksoftirqd/100:08:151
10050520,0irq/346-4848400851-21rngd21:23:040
10050520,0irq/346-484840054-21kswapd023:58:440
81510,0rcu_preempt3-21ksoftirqd/020:09:080
81510,0rcu_preempt19-21ksoftirqd/121:43:031
81510,0rcu_preempt12639-21kworker/0:120:28:130
81510,0rcu_preempt0-21swapper/121:22:441
10050510,0irq/346-4848400851-21rngd21:33:100
10050510,0irq/346-484840054-21kswapd023:38:420
81500,0rcu_preempt3-21ksoftirqd/021:13:210
81500,0rcu_preempt19-21ksoftirqd/122:16:101
10050500,0irq/346-4848400851-21rngd00:16:070
10050500,0irq/346-484840054-21kswapd023:23:570
10050500,0irq/346-484840054-21kswapd022:25:180
10050500,0irq/346-484840054-21kswapd000:36:060
10050500,0irq/346-484840054-21kswapd000:31:210
10050500,0irq/346-484840025885-21cron21:07:520
10050500,0irq/346-484840021599-21ssh22:41:360
81490,0rcu_preempt54-21kswapd022:06:231
81490,0rcu_preempt3-21ksoftirqd/022:33:190
81490,0rcu_preempt3-21ksoftirqd/020:23:210
81490,0rcu_preempt3-21ksoftirqd/020:23:210
81490,0rcu_preempt25781-21kworker/u4:219:13:130
81490,0rcu_preempt19-21ksoftirqd/120:40:181
81490,0rcu_preempt15635-21sendmail-mta21:57:111
10050490,0irq/346-484840054-21kswapd023:30:260
10050490,0irq/346-484840018890-21latency_hist19:07:530
10050490,0irq/346-48484000-21swapper/022:57:100
10050490,0irq/346-48484000-21swapper/022:57:100
10050490,0irq/346-48484000-21swapper/022:48:290
10050480,0irq/346-484840054-21kswapd023:36:220
10050480,0irq/346-48484000-21swapper/023:57:000
10050480,0irq/346-48484000-21swapper/021:57:270
81470,0rcu_preempt19-21ksoftirqd/120:58:071
81470,0rcu_preempt19-21ksoftirqd/119:20:211
10050470,0irq/346-48484005293-21apt-get22:58:050
10050470,0irq/346-484840018908-21cyclictest21:04:331
10050470,0irq/346-48484000-21swapper/021:46:240
9950460,0irq/345-4848400273192sleep021:41:530
81460,0rcu_preempt3-21ksoftirqd/022:13:190
81460,0rcu_preempt3-21ksoftirqd/021:08:170
81460,0rcu_preempt19-21ksoftirqd/120:46:231
81460,0rcu_preempt19-21ksoftirqd/119:43:251
81460,0rcu_preempt19-21ksoftirqd/119:37:531
81460,0rcu_preempt19-21ksoftirqd/119:37:331
10050460,0irq/346-484840015813-21latency23:08:130
10050460,0irq/346-48484000-21swapper/023:50:320
10050460,0irq/346-48484000-21swapper/022:43:280
81450,0rcu_preempt4666-21kworker/0:219:40:080
81450,0rcu_preempt4666-21kworker/0:219:20:070
81450,0rcu_preempt3-21ksoftirqd/021:58:170
81450,0rcu_preempt3-21ksoftirqd/020:03:090
81450,0rcu_preempt25975-21munin-node0
81450,0rcu_preempt19-21ksoftirqd/119:28:421
10050450,0irq/346-484840018589-21sshd19:04:430
81440,0rcu_preempt19-21ksoftirqd/123:03:001
10050440,0irq/346-48484000-21swapper/022:18:100
81430,0rcu_preempt4666-21kworker/0:219:25:080
81430,0rcu_preempt3-21ksoftirqd/020:38:040
81430,0rcu_preempt32175-21apt-get19:48:040
81430,0rcu_preempt19-21ksoftirqd/119:27:521
174092430,0sleep116903-1kworker/1:0H19:03:041
81420,0rcu_preempt31232-21kworker/0:019:47:070
81420,0rcu_preempt14534-21apt-get20:33:050
81400,0rcu_preempt4666-21kworker/0:219:36:410
81400,0rcu_preempt21115-21apt-get20:53:021
81390,0rcu_preempt3-21ksoftirqd/020:58:190
81390,0rcu_preempt3-21ksoftirqd/019:53:120
81390,0rcu_preempt19-21ksoftirqd/119:08:131
194632390,0sleep019004-1kworker/0:1H20:47:540
10050380,0irq/346-484840017360-1kworker/0:0H20:43:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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