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2026-04-28 - 10:25

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Tue Apr 28, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81920,0rcu_preempt851-21rngd21:12:581
81840,0rcu_preempt19-21ksoftirqd/121:34:131
81760,0rcu_preempt54-21kswapd023:31:421
81740,0rcu_preempt19-21ksoftirqd/122:59:291
81740,0rcu_preempt19-21ksoftirqd/121:42:221
81740,0rcu_preempt19-21ksoftirqd/120:03:331
81730,0rcu_preempt19-21ksoftirqd/122:12:071
81730,0rcu_preempt19-21ksoftirqd/100:22:501
81730,0rcu_preempt19-21ksoftirqd/100:22:501
81730,0rcu_preempt0-21swapper/000:28:100
81720,0rcu_preempt3-21ksoftirqd/000:22:570
81720,0rcu_preempt3-21ksoftirqd/000:22:570
81720,0rcu_preempt19-21ksoftirqd/122:07:481
81710,0rcu_preempt19-21ksoftirqd/123:13:561
81710,0rcu_preempt19-21ksoftirqd/123:13:561
81690,0rcu_preempt27509-21dropbear23:38:321
81690,0rcu_preempt19-21ksoftirqd/119:43:391
81690,0rcu_preempt19-21ksoftirqd/119:43:391
81680,0rcu_preempt19-21ksoftirqd/122:26:481
81680,0rcu_preempt19-21ksoftirqd/122:26:481
81660,0rcu_preempt19-21ksoftirqd/122:47:151
81640,0rcu_preempt54-21kswapd023:46:351
81640,0rcu_preempt3-21ksoftirqd/020:18:430
81640,0rcu_preempt19-21ksoftirqd/120:23:431
81630,0rcu_preempt0-21swapper/100:03:541
10050630,0irq/346-48484003046-21apt-get22:08:290
81620,0rcu_preempt19-21ksoftirqd/123:55:241
81620,0rcu_preempt19-21ksoftirqd/121:59:421
81620,0rcu_preempt19-21ksoftirqd/121:23:331
81620,0rcu_preempt19-21ksoftirqd/119:35:571
81610,0rcu_preempt19-21ksoftirqd/123:18:541
81610,0rcu_preempt19-21ksoftirqd/122:13:531
81610,0rcu_preempt19-21ksoftirqd/122:13:531
10050610,0irq/346-48484005582-1kworker/0:3H21:39:310
81600,0rcu_preempt19-21ksoftirqd/123:36:151
81600,0rcu_preempt19-21ksoftirqd/120:08:441
10050600,0irq/346-484840028290-1kworker/0:3H22:17:350
10050600,0irq/346-484840028290-1kworker/0:3H22:17:350
81590,0rcu_preempt3-21ksoftirqd/000:08:360
81590,0rcu_preempt19-21ksoftirqd/123:05:171
81590,0rcu_preempt19-21ksoftirqd/119:22:261
10050590,0irq/346-484840021161-1kworker/0:0H21:21:390
81580,0rcu_preempt19-21ksoftirqd/123:11:491
10050580,0irq/346-48484004377-1kworker/0:3H19:23:400
10050580,0irq/346-484840028290-1kworker/0:3H22:04:190
81570,0rcu_preempt3-21ksoftirqd/023:58:310
81570,0rcu_preempt3-21ksoftirqd/023:58:310
10050570,0irq/346-48484006322-1kworker/0:1H19:33:410
9950560,0irq/345-484840081rcu_preempt21:20:011
81560,0rcu_preempt14430-21kworker/0:223:48:340
9950550,0irq/345-484840081rcu_preempt00:36:501
81550,0rcu_preempt8385-21diskmemload21:35:080
81550,0rcu_preempt7730-21kworker/0:122:19:100
81550,0rcu_preempt3-21ksoftirqd/023:33:420
81550,0rcu_preempt3-21ksoftirqd/022:38:430
81550,0rcu_preempt3-21ksoftirqd/020:03:360
81550,0rcu_preempt2140-21kworker/1:021:15:251
81550,0rcu_preempt19-21ksoftirqd/123:25:261
10050550,0irq/346-484840024862-1kworker/1:2H00:08:581
10050550,0irq/346-4848400181ktimersoftd/100:23:531
81540,0rcu_preempt8216-21kworker/0:221:08:430
81540,0rcu_preempt3-21ksoftirqd/023:44:340
81540,0rcu_preempt3-21ksoftirqd/021:26:410
81540,0rcu_preempt3-21ksoftirqd/019:58:300
81540,0rcu_preempt3-21ksoftirqd/019:48:340
10050540,0irq/346-484840032064-1kworker/0:0H23:10:460
10050540,0irq/346-484840018395-1kworker/0:1H21:57:340
9950530,0irq/345-4848400181ktimersoftd/122:53:141
9950530,0irq/345-4848400181ktimersoftd/122:22:081
81530,0rcu_preempt7701-21kworker/0:023:56:090
81530,0rcu_preempt3-21ksoftirqd/023:23:320
81530,0rcu_preempt3-21ksoftirqd/023:17:130
81530,0rcu_preempt3-21ksoftirqd/023:17:130
81530,0rcu_preempt3-21ksoftirqd/022:48:460
81530,0rcu_preempt3-21ksoftirqd/022:26:550
81530,0rcu_preempt3-21ksoftirqd/022:26:550
81530,0rcu_preempt3-21ksoftirqd/021:02:390
81530,0rcu_preempt3-21ksoftirqd/020:33:420
81530,0rcu_preempt3-21ksoftirqd/020:14:380
81530,0rcu_preempt19-21ksoftirqd/119:53:341
81530,0rcu_preempt19-21ksoftirqd/100:15:471
81530,0rcu_preempt13345-21kworker/0:200:31:410
10050530,0irq/346-484840013562-1kworker/0:0H22:47:380
81520,0rcu_preempt21160-21kworker/0:121:48:220
81520,0rcu_preempt19-21ksoftirqd/123:58:431
81520,0rcu_preempt19-21ksoftirqd/123:58:431
81520,0rcu_preempt19-21ksoftirqd/122:28:411
81520,0rcu_preempt11052-21chrt21:43:340
81510,0rcu_preempt4400-21kworker/0:022:57:270
81510,0rcu_preempt4400-21kworker/0:022:57:270
81510,0rcu_preempt3-21ksoftirqd/000:04:390
81510,0rcu_preempt19-21ksoftirqd/121:33:051
81510,0rcu_preempt13345-21kworker/0:200:34:170
81510,0rcu_preempt11120-21kworker/0:019:08:300
10050510,0irq/346-484840026743-1kworker/0:2H00:15:110
81500,0rcu_preempt3-21ksoftirqd/021:17:460
81500,0rcu_preempt28074-21ntpdc23:38:420
81500,0rcu_preempt19-21ksoftirqd/120:38:401
81490,0rcu_preempt3-21ksoftirqd/022:58:510
81490,0rcu_preempt3-21ksoftirqd/022:31:210
81490,0rcu_preempt3-21ksoftirqd/020:57:020
81490,0rcu_preempt3-21ksoftirqd/020:48:280
81480,0rcu_preempt3-21ksoftirqd/023:18:410
81480,0rcu_preempt3-21ksoftirqd/020:25:410
81480,0rcu_preempt3-21ksoftirqd/019:13:390
81470,0rcu_preempt3-21ksoftirqd/021:31:590
81470,0rcu_preempt3-21ksoftirqd/020:39:500
81470,0rcu_preempt3-21ksoftirqd/019:54:280
81470,0rcu_preempt3-21ksoftirqd/019:03:370
81470,0rcu_preempt21720-21kworker/0:123:05:370
81470,0rcu_preempt21160-21kworker/0:121:59:120
81470,0rcu_preempt19-21ksoftirqd/121:03:371
10050470,0irq/346-484840026238-1kworker/0:2H22:34:260
10050470,0irq/346-484840019352-21rm23:29:450
81460,0rcu_preempt3-21ksoftirqd/020:28:420
81460,0rcu_preempt3-21ksoftirqd/020:08:390
81460,0rcu_preempt25706-21kworker/0:020:43:490
81460,0rcu_preempt19-21ksoftirqd/121:48:301
81460,0rcu_preempt19-21ksoftirqd/120:13:431
81460,0rcu_preempt19-21ksoftirqd/120:00:461
81460,0rcu_preempt19-21ksoftirqd/119:23:581
81460,0rcu_preempt19-21ksoftirqd/100:28:291
81450,0rcu_preempt8385-21diskmemload22:53:301
81450,0rcu_preempt8385-21diskmemload22:53:301
81450,0rcu_preempt8385-21diskmemload22:38:401
81450,0rcu_preempt5078-21php-cgi23:48:351
81450,0rcu_preempt3-21ksoftirqd/021:06:360
81450,0rcu_preempt19-21ksoftirqd/119:42:271
81450,0rcu_preempt19-21ksoftirqd/119:32:411
81450,0rcu_preempt19-21ksoftirqd/119:13:361
81440,0rcu_preempt19-21ksoftirqd/121:53:391
81440,0rcu_preempt19-21ksoftirqd/120:48:371
81440,0rcu_preempt19-21ksoftirqd/120:43:401
81440,0rcu_preempt19-21ksoftirqd/120:19:341
81440,0rcu_preempt1547-21apt-get19:08:291
81430,0rcu_preempt1396-21cyclictest20:33:371
81420,0rcu_preempt4679-21ping19:18:320
81420,0rcu_preempt19-21ksoftirqd/121:43:401
81420,0rcu_preempt19-21ksoftirqd/120:58:421
81420,0rcu_preempt19-21ksoftirqd/119:48:371
10050420,0irq/346-48484009185-21sshd19:29:020
81410,0rcu_preempt19-21ksoftirqd/122:33:281
10050410,0irq/346-484840012872-21munin-run19:43:190
81400,0rcu_preempt3-21ksoftirqd/019:43:530
81400,0rcu_preempt3-21ksoftirqd/019:43:530
81390,0rcu_preempt19-21ksoftirqd/120:55:531
81390,0rcu_preempt19-21ksoftirqd/119:03:351
81370,0rcu_preempt19-21ksoftirqd/120:29:301
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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