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2026-08-22 - 23:38

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 Aug 22, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811220,0rcu_preempt19-21ksoftirqd/111:12:391
100501000,0irq/346-484840017875-1kworker/0:2H12:29:490
10050840,0irq/346-4848400111rcuc/009:10:170
10050810,0irq/346-4848400111rcuc/009:24:170
81800,0rcu_preempt3-21ksoftirqd/010:28:390
81800,0rcu_preempt16991-21ssh09:43:310
10050790,0irq/346-4848400111rcuc/012:26:070
81770,0rcu_preempt3-21ksoftirqd/012:16:110
81760,0rcu_preempt3-21ksoftirqd/009:52:440
81760,0rcu_preempt19-21ksoftirqd/112:36:371
10050750,0irq/346-4848400111rcuc/010:30:170
81740,0rcu_preempt3-21ksoftirqd/011:41:540
81730,0rcu_preempt19-21ksoftirqd/112:20:181
81730,0rcu_preempt19-21ksoftirqd/112:20:181
81730,0rcu_preempt11156-21ssh09:37:231
81730,0rcu_preempt11156-21ssh09:37:231
10050730,0irq/346-4848400111rcuc/010:17:340
10050720,0irq/346-484840041ktimersoftd/012:07:120
81710,0rcu_preempt3-21ksoftirqd/010:06:040
81710,0rcu_preempt19-21ksoftirqd/107:30:011
81700,0rcu_preempt3-21ksoftirqd/012:11:400
81700,0rcu_preempt3-21ksoftirqd/009:38:310
81700,0rcu_preempt3-21ksoftirqd/009:38:310
81700,0rcu_preempt19-21ksoftirqd/110:54:571
81700,0rcu_preempt19-21ksoftirqd/110:54:571
81700,0rcu_preempt19-21ksoftirqd/109:09:501
9950690,0irq/345-4848400111rcuc/011:07:510
81690,0rcu_preempt3-21ksoftirqd/011:51:400
81690,0rcu_preempt19-21ksoftirqd/110:13:121
81680,0rcu_preempt19-21ksoftirqd/111:25:391
81680,0rcu_preempt19-21ksoftirqd/110:24:261
81680,0rcu_preempt19-21ksoftirqd/110:19:381
81670,0rcu_preempt3-21ksoftirqd/010:41:420
81670,0rcu_preempt3-21ksoftirqd/009:29:030
81670,0rcu_preempt19-21ksoftirqd/110:48:451
81670,0rcu_preempt19-21ksoftirqd/110:37:281
81660,0rcu_preempt19-21ksoftirqd/112:31:181
81660,0rcu_preempt19-21ksoftirqd/112:15:291
81650,0rcu_preempt19-21ksoftirqd/111:19:101
81650,0rcu_preempt19-21ksoftirqd/110:43:541
81650,0rcu_preempt19-21ksoftirqd/109:32:401
81640,0rcu_preempt19-21ksoftirqd/112:11:041
81640,0rcu_preempt19-21ksoftirqd/111:57:001
81630,0rcu_preempt19-21ksoftirqd/110:26:321
842799627,0cyclictest54-21kswapd010:24:030
81620,0rcu_preempt3266-21ssh11:39:561
81620,0rcu_preempt19-21ksoftirqd/111:00:301
81620,0rcu_preempt19-21ksoftirqd/110:07:071
81610,0rcu_preempt10478-1kworker/1:1H09:49:551
10050600,0irq/346-484840025361-1kworker/0:2H10:57:350
10050600,0irq/346-484840025361-1kworker/0:2H10:57:350
8427995910,0cyclictest5642-21latency_hist08:39:390
81590,0rcu_preempt9785-21kworker/u4:109:25:341
81590,0rcu_preempt19-21ksoftirqd/111:35:191
81590,0rcu_preempt19-21ksoftirqd/109:57:001
842799582,0cyclictest11713-21ping07:29:500
842799582,0cyclictest11713-21ping07:24:490
81580,0rcu_preempt19-21ksoftirqd/110:52:521
81580,0rcu_preempt19-21ksoftirqd/109:23:201
81580,0rcu_preempt19-21ksoftirqd/107:47:151
81580,0rcu_preempt0-21swapper/111:46:341
10050580,0irq/346-484840054-21kswapd010:04:071
10050580,0irq/346-484840029590-1kworker/1:0H12:06:461
842799572,0cyclictest11713-21ping07:19:510
842799572,0cyclictest11713-21ping07:19:510
842799572,0cyclictest0-21swapper/011:56:380
842799572,0cyclictest0-21swapper/011:29:380
842799571,0cyclictest32712-1kworker/0:3H08:24:370
842799571,0cyclictest17436-21munin-node0
842799571,0cyclictest11713-21ping07:44:500
10050570,0irq/346-48484002147-1kworker/0:0H11:23:310
279142560,0chrt10050irq/346-484840008:07:430
10050560,0irq/346-484840017904-1kworker/1:0H11:21:491
842799556,0cyclictest54-21kswapd011:11:430
842799551,0cyclictest11713-21ping07:19:380
81550,0rcu_preempt3-21ksoftirqd/009:14:500
10050550,0irq/346-484840027863-1kworker/1:0H11:32:281
10050550,0irq/346-484840015429-1kworker/0:1H10:49:390
842799545,0cyclictest1040850kworker/0:1H12:03:500
842799545,0cyclictest1040850kworker/0:1H12:03:500
842799542,0cyclictest11713-21ping07:44:380
81540,0rcu_preempt3-21ksoftirqd/011:45:010
10050540,0irq/346-484840054-21kswapd010:45:220
81530,0rcu_preempt3-21ksoftirqd/010:00:030
81530,0rcu_preempt19-21ksoftirqd/111:09:321
81530,0rcu_preempt19-21ksoftirqd/108:14:491
81530,0rcu_preempt19-21ksoftirqd/108:09:481
81530,0rcu_preempt19-21ksoftirqd/108:09:481
81530,0rcu_preempt13208-21kworker/1:008:50:031
10050530,0irq/346-4848400836-21rngd12:24:370
10050530,0irq/346-4848400836-21rngd12:24:370
10050530,0irq/346-4848400836-21rngd11:01:580
842799527,0cyclictest3-21ksoftirqd/008:01:150
81520,0rcu_preempt3-21ksoftirqd/010:09:560
81520,0rcu_preempt3-21ksoftirqd/008:34:530
81520,0rcu_preempt22116-21kworker/0:311:35:450
10050520,0irq/346-484840054-21kswapd011:51:011
81510,0rcu_preempt3-21ksoftirqd/011:14:540
81510,0rcu_preempt3-21ksoftirqd/009:54:500
81510,0rcu_preempt3-21ksoftirqd/009:29:580
81510,0rcu_preempt3-21ksoftirqd/008:58:300
81510,0rcu_preempt19-21ksoftirqd/107:37:071
81510,0rcu_preempt1051-21lighttpd09:39:581
10050510,0irq/346-484840054-21kswapd012:34:580
10050510,0irq/346-484840022118-1kworker/0:1H11:30:290
81500,0rcu_preempt3-21ksoftirqd/010:36:430
81500,0rcu_preempt3-21ksoftirqd/008:16:040
81500,0rcu_preempt3-21ksoftirqd/007:54:500
81500,0rcu_preempt19-21ksoftirqd/112:24:511
10050500,0irq/346-484840054-21kswapd010:32:241
10050500,0irq/346-484840024482-1kworker/1:2H07:59:381
81490,0rcu_preempt3-21ksoftirqd/009:44:510
81490,0rcu_preempt3-21ksoftirqd/009:44:510
81490,0rcu_preempt3-21ksoftirqd/008:59:530
81490,0rcu_preempt3-21ksoftirqd/008:44:590
81490,0rcu_preempt3-21ksoftirqd/008:26:390
81490,0rcu_preempt3-21ksoftirqd/007:09:560
81490,0rcu_preempt19-21ksoftirqd/108:19:481
81490,0rcu_preempt19-21ksoftirqd/108:04:511
81490,0rcu_preempt19-21ksoftirqd/108:03:491
10050490,0irq/346-484840054-21kswapd009:19:111
10050490,0irq/346-484840024744-21ssh12:01:051
10050490,0irq/346-484840024744-21ssh12:01:051
81480,0rcu_preempt19-21ksoftirqd/107:39:401
81470,0rcu_preempt3-21ksoftirqd/008:29:540
81470,0rcu_preempt19-21ksoftirqd/108:25:061
81470,0rcu_preempt19-21ksoftirqd/107:20:141
81470,0rcu_preempt19-21ksoftirqd/107:20:141
81460,0rcu_preempt3-21ksoftirqd/007:04:530
81450,0rcu_preempt3-21ksoftirqd/008:09:550
81450,0rcu_preempt3-21ksoftirqd/008:09:550
81440,0rcu_preempt3-21ksoftirqd/008:49:570
81440,0rcu_preempt19-21ksoftirqd/107:25:511
10050440,0irq/346-484840019926-21ssh09:45:491
10050440,0irq/346-484840019926-21ssh09:45:491
81430,0rcu_preempt19-21ksoftirqd/108:35:061
81430,0rcu_preempt19-21ksoftirqd/107:09:381
81410,0rcu_preempt10161-21kworker/0:209:04:500
81400,0rcu_preempt9146-21meminfo07:09:581
81400,0rcu_preempt19-21ksoftirqd/109:05:021
81400,0rcu_preempt19-21ksoftirqd/108:59:531
81400,0rcu_preempt19-21ksoftirqd/108:54:501
81400,0rcu_preempt19-21ksoftirqd/108:39:511
81400,0rcu_preempt19-21ksoftirqd/107:14:571
81390,0rcu_preempt3-21ksoftirqd/007:49:540
81390,0rcu_preempt19-21ksoftirqd/108:30:031
81380,0rcu_preempt19-21ksoftirqd/108:45:051
81380,0rcu_preempt0-21swapper/107:50:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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