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2026-09-02 - 19:31

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 Wed Sep 02, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811290,0rcu_preempt19-21ksoftirqd/110:49:501
811280,0rcu_preempt19-21ksoftirqd/109:54:381
811240,0rcu_preempt19-21ksoftirqd/111:52:591
811110,0rcu_preempt5864-1kworker/1:3H09:17:221
811080,0rcu_preempt54-21kswapd011:30:541
811070,0rcu_preempt19-21ksoftirqd/107:19:291
10050800,0irq/346-4848400111rcuc/012:35:560
10050780,0irq/346-4848400111rcuc/009:46:120
10050780,0irq/346-4848400111rcuc/009:46:120
10050770,0irq/346-4848400111rcuc/010:45:480
10050750,0irq/346-4848400111rcuc/009:52:400
81740,0rcu_preempt3-21ksoftirqd/011:21:010
10050740,0irq/346-484840041ktimersoftd/012:16:550
10050740,0irq/346-4848400111rcuc/012:33:560
10050740,0irq/346-4848400111rcuc/010:39:040
10050730,0irq/346-4848400111rcuc/011:39:360
10050730,0irq/346-4848400111rcuc/010:30:580
81720,0rcu_preempt3-21ksoftirqd/009:11:470
81710,0rcu_preempt3-21ksoftirqd/010:55:450
81710,0rcu_preempt3-21ksoftirqd/009:28:260
81710,0rcu_preempt25019-1kworker/0:2H12:24:160
81710,0rcu_preempt19-21ksoftirqd/109:39:281
81710,0rcu_preempt19-21ksoftirqd/109:23:061
2358899691,0cyclictest0-21swapper/009:58:500
81680,0rcu_preempt3-21ksoftirqd/009:20:590
81680,0rcu_preempt19-21ksoftirqd/112:28:361
81680,0rcu_preempt19-21ksoftirqd/110:18:111
81670,0rcu_preempt19-21ksoftirqd/110:44:161
81670,0rcu_preempt19-21ksoftirqd/110:20:331
2358899676,0cyclictest786-1kworker/0:0H09:30:070
2358899672,0cyclictest2960-21apt-get11:54:380
2358899672,0cyclictest2960-21apt-get11:54:380
23588996710,0cyclictest19008-1kworker/0:2H10:04:280
23588996710,0cyclictest19008-1kworker/0:2H10:04:280
81660,0rcu_preempt19-21ksoftirqd/111:00:431
81660,0rcu_preempt19-21ksoftirqd/109:42:271
2358899669,0cyclictest29149-1kworker/0:3H10:14:120
23588996610,0cyclictest1761250kworker/0:3H11:08:340
81640,0rcu_preempt19-21ksoftirqd/111:09:471
81640,0rcu_preempt19-21ksoftirqd/111:09:471
81640,0rcu_preempt19-21ksoftirqd/110:58:091
81640,0rcu_preempt19-21ksoftirqd/109:50:501
10050640,0irq/346-484840054-21kswapd011:26:010
81630,0rcu_preempt30058-1kworker/1:1H12:30:171
81620,0rcu_preempt19-21ksoftirqd/112:02:561
81620,0rcu_preempt19-21ksoftirqd/111:48:331
81620,0rcu_preempt0-21swapper/110:06:021
10050620,0irq/346-484840019009-1kworker/1:0H10:01:351
10050620,0irq/346-484840019009-1kworker/1:0H10:01:351
81610,0rcu_preempt3-21ksoftirqd/011:59:560
81610,0rcu_preempt3-21ksoftirqd/009:14:380
81610,0rcu_preempt19-21ksoftirqd/110:38:311
81610,0rcu_preempt19-21ksoftirqd/110:28:201
2358899612,0cyclictest26869-21ping07:39:460
81600,0rcu_preempt19-21ksoftirqd/112:38:491
81600,0rcu_preempt19-21ksoftirqd/109:14:191
2358899604,0cyclictest271450kworker/0:3H12:27:020
23588996013,0cyclictest0-21swapper/011:50:200
10050600,0irq/346-484840054-21kswapd011:34:391
10050600,0irq/346-484840030074-1kworker/0:3H11:17:320
81590,0rcu_preempt19-21ksoftirqd/112:10:121
81590,0rcu_preempt19-21ksoftirqd/109:33:481
2358899592,0cyclictest3793-1kworker/0:1H10:19:390
2358899592,0cyclictest26869-21ping07:29:400
2358899592,0cyclictest13086-21ssh12:04:390
2358899592,0cyclictest0-21swapper/009:34:590
23588995918,0cyclictest24442-1kworker/0:3H10:49:400
2358899591,0cyclictest31796-21munin-node0
10050590,0irq/346-484840054-21kswapd010:13:131
10050590,0irq/346-484840054-21kswapd009:25:181
2358899581,0cyclictest26869-21ping07:19:290
10050580,0irq/346-48484007755-1kworker/0:1H11:29:500
10050580,0irq/346-484840054-21kswapd011:55:101
10050580,0irq/346-484840054-21kswapd011:55:101
81570,0rcu_preempt3-21ksoftirqd/010:39:390
81570,0rcu_preempt26869-21ping07:34:520
81570,0rcu_preempt19-21ksoftirqd/111:40:021
81570,0rcu_preempt19-21ksoftirqd/111:05:571
81570,0rcu_preempt14530-21ssh10:29:401
2358899572,0cyclictest0-21swapper/008:54:530
2358899568,0cyclictest274150kworker/0:0H11:35:150
2358899562,0cyclictest29453-21grep09:39:510
2358899562,0cyclictest29443-21munin-node0
2358899561,0cyclictest26869-21ping07:44:400
2358899561,0cyclictest22279-21sh12:13:510
81550,0rcu_preempt16944-21kworker/0:207:14:410
81550,0rcu_preempt1445-21runrttasks08:08:221
23588995512,0cyclictest0-21swapper/011:10:320
23588995512,0cyclictest0-21swapper/011:10:320
10050550,0irq/346-4848400836-21rngd11:46:520
10050550,0irq/346-484840054-21kswapd011:27:031
10050550,0irq/346-484840054-21kswapd011:20:351
10050550,0irq/346-48484000-21swapper/010:04:390
81540,0rcu_preempt19-21ksoftirqd/111:14:571
2358899542,0cyclictest16210-21taskset08:24:470
10050540,0irq/346-484840054-21kswapd012:06:581
10050540,0irq/346-484840054-21kswapd009:45:091
10050540,0irq/346-484840054-21kswapd009:45:091
10050540,0irq/346-484840023262-21ssh12:14:431
81530,0rcu_preempt3-21ksoftirqd/008:44:510
81530,0rcu_preempt19-21ksoftirqd/108:24:401
81530,0rcu_preempt19-21ksoftirqd/108:09:401
2358899532,0cyclictest0-21swapper/011:02:370
10050520,0irq/346-48484009396-21munin-node0
10050520,0irq/346-484840054-21kswapd012:19:341
81510,0rcu_preempt3-21ksoftirqd/009:04:390
81510,0rcu_preempt3-21ksoftirqd/009:04:390
81510,0rcu_preempt3-21ksoftirqd/008:02:220
81510,0rcu_preempt17795-21diskstats08:29:430
81500,0rcu_preempt19-21ksoftirqd/108:19:451
81500,0rcu_preempt19-21ksoftirqd/107:24:481
2358899507,0cyclictest9950irq/345-484840007:59:280
2358899507,0cyclictest9950irq/345-484840007:59:280
81490,0rcu_preempt27157-21kworker/u4:210:49:051
81490,0rcu_preempt19-21ksoftirqd/108:14:391
81480,0rcu_preempt7299-21ping08:19:290
81480,0rcu_preempt19487-21php-cgi08:34:460
81470,0rcu_preempt7299-21ping08:04:510
81470,0rcu_preempt3-21ksoftirqd/008:39:500
81470,0rcu_preempt3-21ksoftirqd/007:04:460
81460,0rcu_preempt3-21ksoftirqd/008:21:010
81460,0rcu_preempt3-21ksoftirqd/008:09:570
81460,0rcu_preempt19-21ksoftirqd/107:59:291
81450,0rcu_preempt3-21ksoftirqd/008:49:430
81450,0rcu_preempt3-21ksoftirqd/007:49:390
81450,0rcu_preempt19-21ksoftirqd/107:40:191
81450,0rcu_preempt19-21ksoftirqd/107:04:491
81440,0rcu_preempt30981-21ntp_states07:29:571
81440,0rcu_preempt19-21ksoftirqd/107:54:481
81440,0rcu_preempt19-21ksoftirqd/107:54:481
81430,0rcu_preempt3-21ksoftirqd/007:09:410
81430,0rcu_preempt19-21ksoftirqd/107:35:031
81420,0rcu_preempt19-21ksoftirqd/109:04:381
81420,0rcu_preempt19-21ksoftirqd/109:04:381
81420,0rcu_preempt19-21ksoftirqd/107:45:031
81420,0rcu_preempt0-21swapper/008:59:470
81410,0rcu_preempt0-21swapper/107:09:451
9950400,0irq/345-484840026917-21latency_hist07:19:281
81400,0rcu_preempt19-21ksoftirqd/108:29:521
81390,0rcu_preempt19-21ksoftirqd/108:49:401
81380,0rcu_preempt19-21ksoftirqd/108:59:531
81380,0rcu_preempt19-21ksoftirqd/108:58:071
81380,0rcu_preempt19-21ksoftirqd/108:46:201
81380,0rcu_preempt19-21ksoftirqd/108:39:301
81370,0rcu_preempt19-21ksoftirqd/108:34:551
81370,0rcu_preempt19-21ksoftirqd/107:51:481
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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