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2026-04-18 - 23:03

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 highest latencies:
System rackaslot5s.osadl.org (updated Sat Apr 18, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81920,0rcu_preempt54-21kswapd011:02:240
10050810,0irq/346-484840054-21kswapd009:24:030
81740,0rcu_preempt3-21ksoftirqd/011:18:380
81730,0rcu_preempt19-21ksoftirqd/107:23:271
10050730,0irq/346-484840012718-1kworker/0:0H11:17:580
81710,0rcu_preempt3-21ksoftirqd/007:58:500
10050700,0irq/346-48484005730-1kworker/0:0H10:37:240
81690,0rcu_preempt3-21ksoftirqd/011:43:510
81690,0rcu_preempt3-21ksoftirqd/008:03:540
81680,0rcu_preempt9239-21apt-get08:43:390
81680,0rcu_preempt4306-21apt-get08:28:390
10050680,0irq/346-4848400792-1kworker/0:1H10:30:390
81670,0rcu_preempt17663-21kworker/0:211:30:060
81670,0rcu_preempt10554-21kworker/0:112:19:260
81660,0rcu_preempt5322-21kworker/0:111:34:360
81660,0rcu_preempt3-21ksoftirqd/009:33:540
81650,0rcu_preempt27719-21ping08:18:500
81650,0rcu_preempt12363-21php-cgi07:13:450
81650,0rcu_preempt12363-21php-cgi07:13:450
81650,0rcu_preempt0-21swapper/010:28:230
81640,0rcu_preempt3-21ksoftirqd/011:53:530
81640,0rcu_preempt3-21ksoftirqd/008:48:510
81640,0rcu_preempt22282-21ssh11:58:370
81630,0rcu_preempt19961-21ssh12:28:490
81620,0rcu_preempt6661-21ps08:33:520
81620,0rcu_preempt3-21ksoftirqd/012:09:550
81620,0rcu_preempt0-21swapper/010:43:460
81610,0rcu_preempt3-21ksoftirqd/009:44:020
81610,0rcu_preempt3-21ksoftirqd/009:38:390
81610,0rcu_preempt21544-21sh10:18:410
81610,0rcu_preempt15791-21ssh10:13:000
10050610,0irq/346-484840054-21kswapd009:13:400
81600,0rcu_preempt3-21ksoftirqd/012:17:490
81600,0rcu_preempt20335-21apt-get11:23:390
81600,0rcu_preempt20335-21apt-get11:23:390
81600,0rcu_preempt0-21swapper/011:05:440
81590,0rcu_preempt30336-21df_abs08:08:420
81590,0rcu_preempt17604-21apt-get09:08:400
81590,0rcu_preempt0-21swapper/012:24:020
81590,0rcu_preempt0-21swapper/010:52:380
81590,0rcu_preempt0-21swapper/009:55:010
81590,0rcu_preempt0-21swapper/009:03:470
81590,0rcu_preempt0-21swapper/009:03:470
81580,0rcu_preempt3-21ksoftirqd/008:53:520
81580,0rcu_preempt27372-21apt-get09:18:400
81580,0rcu_preempt0-21swapper/011:38:590
10050580,0irq/346-484840054-21kswapd011:16:591
10050580,0irq/346-4848400111rcuc/010:13:500
81570,0rcu_preempt3-21ksoftirqd/008:38:480
81570,0rcu_preempt3-21ksoftirqd/008:23:560
81570,0rcu_preempt3-21ksoftirqd/007:50:420
81570,0rcu_preempt0-21swapper/011:48:280
81570,0rcu_preempt0-21swapper/011:10:360
81570,0rcu_preempt0-21swapper/009:50:320
81570,0rcu_preempt0-21swapper/009:30:110
81560,0rcu_preempt3-21ksoftirqd/010:05:070
81560,0rcu_preempt0-21swapper/012:35:220
81550,0rcu_preempt3-21ksoftirqd/010:54:000
81550,0rcu_preempt3-21ksoftirqd/008:13:490
81550,0rcu_preempt14177-21apt-get08:58:390
81550,0rcu_preempt0-21swapper/010:38:590
81540,0rcu_preempt3-21ksoftirqd/009:58:440
81530,0rcu_preempt19-21ksoftirqd/112:06:241
81530,0rcu_preempt19-21ksoftirqd/108:23:381
81520,0rcu_preempt19-21ksoftirqd/111:22:491
81520,0rcu_preempt0-21swapper/012:07:510
10050520,0irq/346-484840054-21kswapd011:08:511
10050520,0irq/346-484840020518-1kworker/1:1H10:52:151
81510,0rcu_preempt19-21ksoftirqd/108:03:411
81510,0rcu_preempt19-21ksoftirqd/107:23:411
10050510,0irq/346-484840024600-1kworker/1:0H12:25:591
81500,0rcu_preempt3-21ksoftirqd/007:08:390
81500,0rcu_preempt19-21ksoftirqd/110:13:421
9950490,0irq/345-48484000-21swapper/110:54:501
10050490,0irq/346-484840029236-21ssh10:26:201
10050490,0irq/346-484840026405-1kworker/1:0H09:51:481
10050480,0irq/346-484840012281-21ssh10:08:501
81470,0rcu_preempt19-21ksoftirqd/107:48:411
10050470,0irq/346-48484006917-1kworker/1:1H12:18:041
1031699464,0cyclictest13598-21ping07:28:420
10050460,0irq/346-484840013598-21ping07:43:591
81450,0rcu_preempt19-21ksoftirqd/111:40:141
81450,0rcu_preempt19-21ksoftirqd/110:37:351
81450,0rcu_preempt0-21swapper/007:53:460
10050450,0irq/346-48484000-21swapper/112:20:081
10050450,0irq/346-48484000-21swapper/109:58:471
81440,0rcu_preempt3-21ksoftirqd/007:41:190
81440,0rcu_preempt3-21ksoftirqd/007:37:350
81440,0rcu_preempt3-21ksoftirqd/007:04:100
81440,0rcu_preempt19-21ksoftirqd/111:32:071
81440,0rcu_preempt19-21ksoftirqd/107:28:441
81440,0rcu_preempt10411-21kworker/1:209:33:531
10050440,0irq/346-48484007176-1kworker/1:0H08:35:481
81430,0rcu_preempt3439-21kworker/0:007:23:390
81430,0rcu_preempt3-21ksoftirqd/007:18:520
81430,0rcu_preempt20767-21munin-node1
81430,0rcu_preempt19-21ksoftirqd/109:28:421
81430,0rcu_preempt19-21ksoftirqd/107:38:571
81430,0rcu_preempt18388-21kworker/0:107:46:460
10050430,0irq/346-48484009823-1kworker/1:1H11:45:301
81420,0rcu_preempt19-21ksoftirqd/111:05:171
81420,0rcu_preempt19-21ksoftirqd/110:18:471
81420,0rcu_preempt19-21ksoftirqd/109:13:401
10050420,0irq/346-484840029804-21munin-node1
10050420,0irq/346-484840019658-1kworker/1:2H11:55:461
10050420,0irq/346-48484000-21swapper/109:21:391
81410,0rcu_preempt19-21ksoftirqd/111:23:511
81410,0rcu_preempt19-21ksoftirqd/111:23:511
81410,0rcu_preempt19-21ksoftirqd/109:09:111
10050410,0irq/346-484840029184-21ssh10:58:541
10050410,0irq/346-484840027868-21ssh12:37:041
10050410,0irq/346-48484001067-21lighttpd10:45:421
10050410,0irq/346-484840010469-21dropbear07:08:381
81400,0rcu_preempt19-21ksoftirqd/112:10:291
81400,0rcu_preempt19-21ksoftirqd/110:07:401
81400,0rcu_preempt19-21ksoftirqd/109:23:371
10050400,0irq/346-484840030415-21diskstats11:33:431
10050400,0irq/346-484840022395-21munin-node1
10050400,0irq/346-484840020115-21ssh12:28:511
10050400,0irq/346-484840014617-21ssh11:50:101
81390,0rcu_preempt31876-21wget08:13:411
81390,0rcu_preempt28010-1kworker/1:1H08:03:271
81390,0rcu_preempt19-21ksoftirqd/109:40:221
81390,0rcu_preempt19-21ksoftirqd/107:18:271
81390,0rcu_preempt19-21ksoftirqd/107:18:271
10050390,0irq/346-484840010293-21ssh10:39:381
81380,0rcu_preempt19-21ksoftirqd/108:38:421
81380,0rcu_preempt19-21ksoftirqd/108:08:451
10050380,0irq/346-484840030992-21ssh10:28:291
81360,0rcu_preempt19-21ksoftirqd/108:18:421
1699360,0migration/18981-21cpu07:03:411
154612360,0sleep115419-1kworker/1:3H09:01:211
81350,0rcu_preempt19-21ksoftirqd/108:33:261
81340,0rcu_preempt19-21ksoftirqd/107:33:441
138602340,0chrt13757-1kworker/1:2H08:56:591
104092340,0sleep18834-1kworker/1:1H08:45:061
10050340,0irq/346-48484000-21swapper/108:52:001
171752330,0sleep117059-1kworker/1:0H09:07:091
171752330,0sleep117059-1kworker/1:0H09:07:091
9950290,0irq/345-484840026698-21cron07:58:261
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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