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2026-04-28 - 22:13

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 Tue Apr 28, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81930,0rcu_preempt19-21ksoftirqd/111:13:431
81920,0rcu_preempt54-21kswapd009:28:411
81920,0rcu_preempt19-21ksoftirqd/110:43:341
81770,0rcu_preempt20179-21ssh11:53:391
81750,0rcu_preempt19-21ksoftirqd/109:43:451
81740,0rcu_preempt19-21ksoftirqd/111:45:581
81730,0rcu_preempt19-21ksoftirqd/110:21:581
81720,0rcu_preempt19-21ksoftirqd/109:13:371
81710,0rcu_preempt54-21kswapd011:14:520
81700,0rcu_preempt3-21ksoftirqd/011:23:270
81700,0rcu_preempt19-21ksoftirqd/112:36:061
81700,0rcu_preempt19-21ksoftirqd/111:34:071
81680,0rcu_preempt3-21ksoftirqd/011:07:020
81680,0rcu_preempt19-21ksoftirqd/111:03:301
81660,0rcu_preempt54-21kswapd009:38:440
81650,0rcu_preempt27226-21ping08:13:411
81650,0rcu_preempt19-21ksoftirqd/111:51:291
81650,0rcu_preempt19-21ksoftirqd/110:06:561
81640,0rcu_preempt18181-21diskmemload12:23:340
9950630,0irq/345-48484000-21swapper/109:50:141
81630,0rcu_preempt19-21ksoftirqd/112:32:591
81630,0rcu_preempt19-21ksoftirqd/110:38:281
81620,0rcu_preempt19-21ksoftirqd/110:37:181
81620,0rcu_preempt19-21ksoftirqd/110:13:331
9950610,0irq/345-4848400181ktimersoftd/110:02:201
81610,0rcu_preempt5449-21php-cgi08:28:340
81610,0rcu_preempt19-21ksoftirqd/111:42:381
81610,0rcu_preempt19-21ksoftirqd/109:38:521
10050610,0irq/346-484840011781-21ssh11:12:501
10050610,0irq/346-484840011781-21ssh11:12:501
81600,0rcu_preempt19-21ksoftirqd/111:18:231
10050600,0irq/346-4848400181ktimersoftd/112:13:291
9950590,0irq/345-484840081rcu_preempt12:24:381
81590,0rcu_preempt29728-21kworker/0:010:53:340
81590,0rcu_preempt19-21ksoftirqd/109:11:531
9950580,0irq/345-484840021738-1kworker/0:1H11:59:590
81580,0rcu_preempt2274-1kworker/0:3H10:33:420
81580,0rcu_preempt19-21ksoftirqd/112:09:591
9950570,0irq/345-4848400181ktimersoftd/109:58:171
81570,0rcu_preempt3-21ksoftirqd/010:38:270
81570,0rcu_preempt3015-21kworker/0:209:23:320
81570,0rcu_preempt19-21ksoftirqd/110:53:421
81570,0rcu_preempt19-21ksoftirqd/110:10:491
81570,0rcu_preempt19-21ksoftirqd/110:10:491
9950560,0irq/345-484840019-21ksoftirqd/110:30:131
9950560,0irq/345-4848400181ktimersoftd/112:21:171
81560,0rcu_preempt3-21ksoftirqd/010:28:280
81560,0rcu_preempt0-21swapper/108:25:341
10050560,0irq/346-484840027500-1kworker/0:2H10:27:190
9950550,0irq/345-4848400181ktimersoftd/109:20:441
9950550,0irq/345-4848400171rcuc/111:26:321
81550,0rcu_preempt54-21kswapd012:06:501
81550,0rcu_preempt32459-21kworker/0:108:13:290
81550,0rcu_preempt3-21ksoftirqd/011:33:420
81550,0rcu_preempt3-21ksoftirqd/009:43:280
81550,0rcu_preempt3-21ksoftirqd/007:48:360
81550,0rcu_preempt3-21ksoftirqd/007:08:320
81550,0rcu_preempt29153-21kworker/0:108:06:000
10050550,0irq/346-484840021738-1kworker/0:1H12:03:230
10050550,0irq/346-484840015255-1kworker/0:2H11:50:350
81540,0rcu_preempt3-21ksoftirqd/010:58:330
81540,0rcu_preempt3-21ksoftirqd/009:32:270
81540,0rcu_preempt19-21ksoftirqd/110:50:031
81540,0rcu_preempt19-21ksoftirqd/108:03:291
10050540,0irq/346-48484009503-1kworker/0:2H11:22:560
9950530,0irq/345-4848400181ktimersoftd/111:59:431
81530,0rcu_preempt3-21ksoftirqd/012:33:300
81530,0rcu_preempt3-21ksoftirqd/012:18:430
81530,0rcu_preempt3-21ksoftirqd/009:18:460
81530,0rcu_preempt3-21ksoftirqd/008:43:380
81530,0rcu_preempt19-21ksoftirqd/109:33:411
10050530,0irq/346-484840010767-1kworker/0:0H09:35:030
9950520,0irq/345-4848400171rcuc/109:25:121
9950520,0irq/345-4848400171rcuc/107:58:171
81520,0rcu_preempt3-21ksoftirqd/009:17:310
81520,0rcu_preempt3-21ksoftirqd/009:08:280
81520,0rcu_preempt19-21ksoftirqd/108:18:291
10050520,0irq/346-48484000-21swapper/010:13:190
81510,0rcu_preempt3-21ksoftirqd/012:31:420
81510,0rcu_preempt3-21ksoftirqd/010:08:380
81510,0rcu_preempt3-21ksoftirqd/010:08:380
81510,0rcu_preempt19-21ksoftirqd/107:58:281
10050510,0irq/346-484840020742-1kworker/0:2H07:38:370
9950500,0irq/345-48484000-21swapper/011:10:070
9950500,0irq/345-48484000-21swapper/011:10:070
81500,0rcu_preempt7555-21kworker/0:011:54:460
81500,0rcu_preempt7387-21cat12:13:330
81500,0rcu_preempt3-21ksoftirqd/011:47:530
81500,0rcu_preempt3-21ksoftirqd/010:23:000
81500,0rcu_preempt3-21ksoftirqd/009:58:280
81500,0rcu_preempt3-21ksoftirqd/008:22:530
10050500,0irq/346-484840022117-1kworker/0:0H10:52:110
81490,0rcu_preempt9697-21apt-get07:03:290
81490,0rcu_preempt3-21ksoftirqd/011:30:400
81490,0rcu_preempt3-21ksoftirqd/009:05:180
81490,0rcu_preempt3-21ksoftirqd/008:55:320
81490,0rcu_preempt3-21ksoftirqd/008:48:350
10050490,0irq/346-48484005418-21ssh11:38:400
10050490,0irq/346-484840023302-1kworker/0:3H09:50:320
9950480,0irq/345-48484003018-21switchtime12:08:430
81480,0rcu_preempt3-21ksoftirqd/009:54:030
81480,0rcu_preempt19-21ksoftirqd/111:02:011
81480,0rcu_preempt0-21swapper/111:30:311
81470,0rcu_preempt3-21ksoftirqd/008:08:440
81470,0rcu_preempt3-21ksoftirqd/008:00:360
81470,0rcu_preempt3-21ksoftirqd/007:53:410
81470,0rcu_preempt19-21ksoftirqd/107:40:391
81470,0rcu_preempt19-21ksoftirqd/107:34:471
10050470,0irq/346-48484007974-21ssh10:03:300
10050470,0irq/346-484840017475-21rm10:45:110
81460,0rcu_preempt19-21ksoftirqd/108:33:281
10050460,0irq/346-48484008306-1kworker/0:0H08:38:410
81450,0rcu_preempt3-21ksoftirqd/008:33:350
81450,0rcu_preempt3-21ksoftirqd/008:23:470
81450,0rcu_preempt19-21ksoftirqd/107:48:381
81450,0rcu_preempt19-21ksoftirqd/107:25:131
81450,0rcu_preempt19-21ksoftirqd/107:05:131
81440,0rcu_preempt19-21ksoftirqd/110:23:391
81440,0rcu_preempt19-21ksoftirqd/107:43:531
81440,0rcu_preempt19-21ksoftirqd/107:33:061
81440,0rcu_preempt19-21ksoftirqd/107:18:421
81430,0rcu_preempt19276-21kworker/0:207:46:450
81430,0rcu_preempt19-21ksoftirqd/108:51:361
81430,0rcu_preempt13399-21apt-get08:53:291
81420,0rcu_preempt3-21ksoftirqd/007:13:320
81420,0rcu_preempt3-21ksoftirqd/007:13:320
81420,0rcu_preempt19-21ksoftirqd/108:58:311
81420,0rcu_preempt19-21ksoftirqd/108:08:421
81410,0rcu_preempt19-21ksoftirqd/108:46:421
81410,0rcu_preempt15774-21ps08:58:430
81400,0rcu_preempt17868-21runrttasks09:05:051
81400,0rcu_preempt11549-21df_inode07:08:351
81390,0rcu_preempt19-21ksoftirqd/108:32:381
9950380,0irq/345-484840014482-21ping07:28:350
81380,0rcu_preempt3-21ksoftirqd/007:33:300
81380,0rcu_preempt0-21swapper/107:13:401
81380,0rcu_preempt0-21swapper/107:13:401
10050370,0irq/346-484840017769-21munin-run07:28:180
81350,0rcu_preempt3-21ksoftirqd/007:18:290
81350,0rcu_preempt19-21ksoftirqd/108:41:381
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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