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2026-08-18 - 14:35

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 Tue Aug 18, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81940,0rcu_preempt3907-21ssh22:30:031
81880,0rcu_preempt3-21ksoftirqd/022:20:480
10050780,0irq/346-484840032304-1kworker/0:1H23:31:520
81760,0rcu_preempt3-21ksoftirqd/023:05:040
81750,0rcu_preempt54-21kswapd023:40:100
81730,0rcu_preempt3-21ksoftirqd/023:35:110
81730,0rcu_preempt3-21ksoftirqd/022:38:080
81730,0rcu_preempt19-21ksoftirqd/122:45:111
81720,0rcu_preempt3-21ksoftirqd/022:16:300
81720,0rcu_preempt3-21ksoftirqd/021:14:090
81720,0rcu_preempt19-21ksoftirqd/121:53:021
81710,0rcu_preempt3-21ksoftirqd/021:56:230
81710,0rcu_preempt3-21ksoftirqd/000:23:180
81700,0rcu_preempt3-21ksoftirqd/022:04:160
81700,0rcu_preempt3-21ksoftirqd/022:04:160
81700,0rcu_preempt3-21ksoftirqd/021:46:460
81700,0rcu_preempt19-21ksoftirqd/100:25:301
81700,0rcu_preempt19-21ksoftirqd/100:12:081
10050700,0irq/346-48484003521-1kworker/0:1H22:06:460
81690,0rcu_preempt32447-21ntp_states21:20:081
81690,0rcu_preempt3-21ksoftirqd/023:17:180
81690,0rcu_preempt3-21ksoftirqd/023:03:470
81690,0rcu_preempt3-21ksoftirqd/021:35:530
81680,0rcu_preempt3-21ksoftirqd/022:54:590
81680,0rcu_preempt3-21ksoftirqd/022:31:560
81680,0rcu_preempt3-21ksoftirqd/021:52:230
81680,0rcu_preempt3-21ksoftirqd/021:42:340
81680,0rcu_preempt3-21ksoftirqd/000:33:490
81680,0rcu_preempt19-21ksoftirqd/122:52:161
81670,0rcu_preempt3-21ksoftirqd/022:26:280
81670,0rcu_preempt3-21ksoftirqd/021:26:290
81660,0rcu_preempt3-21ksoftirqd/021:32:370
81660,0rcu_preempt19-21ksoftirqd/121:32:081
81650,0rcu_preempt23839-21taskset23:55:430
81650,0rcu_preempt23839-21taskset23:55:430
81650,0rcu_preempt19-21ksoftirqd/123:35:371
81650,0rcu_preempt19-21ksoftirqd/122:59:531
81640,0rcu_preempt19-21ksoftirqd/122:57:591
81640,0rcu_preempt19-21ksoftirqd/100:16:411
81630,0rcu_preempt19-21ksoftirqd/123:05:561
81630,0rcu_preempt19-21ksoftirqd/121:54:571
81630,0rcu_preempt19-21ksoftirqd/100:02:421
81620,0rcu_preempt3-21ksoftirqd/023:46:550
81620,0rcu_preempt19-21ksoftirqd/123:27:011
81620,0rcu_preempt19-21ksoftirqd/119:39:431
81620,0rcu_preempt19-21ksoftirqd/100:34:181
81610,0rcu_preempt19-21ksoftirqd/100:36:551
81600,0rcu_preempt3-21ksoftirqd/023:49:540
81600,0rcu_preempt3-21ksoftirqd/021:00:040
81600,0rcu_preempt19-21ksoftirqd/123:48:251
81600,0rcu_preempt19-21ksoftirqd/123:42:291
81600,0rcu_preempt19-21ksoftirqd/120:09:561
81590,0rcu_preempt3-21ksoftirqd/019:10:060
81590,0rcu_preempt19-21ksoftirqd/122:41:111
81590,0rcu_preempt19-21ksoftirqd/100:08:091
223602590,0chrt10050irq/346-484840019:31:090
81580,0rcu_preempt21482-21diskmemload22:40:130
81570,0rcu_preempt19-21ksoftirqd/123:11:061
81560,0rcu_preempt640-21if_eth020:05:031
81560,0rcu_preempt19-21ksoftirqd/119:30:151
81550,0rcu_preempt54-21kswapd022:07:001
81550,0rcu_preempt3-21ksoftirqd/000:14:520
81550,0rcu_preempt30670-21ping20:15:120
81550,0rcu_preempt19-21ksoftirqd/122:35:251
81550,0rcu_preempt19-21ksoftirqd/121:41:581
81540,0rcu_preempt3-21ksoftirqd/021:04:590
81540,0rcu_preempt3-21ksoftirqd/020:55:010
81540,0rcu_preempt3-21ksoftirqd/020:55:010
81540,0rcu_preempt19-21ksoftirqd/120:19:541
10050540,0irq/346-484840027400-1kworker/0:2H23:27:370
81530,0rcu_preempt3-21ksoftirqd/023:59:520
81530,0rcu_preempt3-21ksoftirqd/021:15:130
81530,0rcu_preempt3-21ksoftirqd/020:44:580
81530,0rcu_preempt3-21ksoftirqd/019:05:090
81530,0rcu_preempt10301-21chrt23:09:480
10050530,0irq/346-48484002046-1kworker/0:1H00:07:380
81520,0rcu_preempt3-21ksoftirqd/020:35:090
81520,0rcu_preempt3-21ksoftirqd/020:24:540
81520,0rcu_preempt3-21ksoftirqd/020:10:010
81520,0rcu_preempt19-21ksoftirqd/123:53:561
10050520,0irq/346-484840010601-1kworker/0:2H22:44:510
81510,0rcu_preempt3-21ksoftirqd/022:09:520
10050510,0irq/346-484840019681-1kworker/0:0H00:26:540
81500,0rcu_preempt3-21ksoftirqd/023:20:070
81500,0rcu_preempt3-21ksoftirqd/020:20:120
81500,0rcu_preempt3-21ksoftirqd/000:35:330
81500,0rcu_preempt23474-21php-cgi22:50:010
81500,0rcu_preempt19-21ksoftirqd/120:00:031
81490,0rcu_preempt32504-21kworker/0:220:06:020
81490,0rcu_preempt3-21ksoftirqd/020:43:090
81490,0rcu_preempt19-21ksoftirqd/122:04:041
81490,0rcu_preempt19-21ksoftirqd/122:04:041
81490,0rcu_preempt19-21ksoftirqd/120:15:161
10050490,0irq/346-48484006974-1kworker/0:2H00:13:100
81480,0rcu_preempt3-21ksoftirqd/021:20:070
81480,0rcu_preempt30670-21ping20:00:130
81480,0rcu_preempt19-21ksoftirqd/123:56:551
81480,0rcu_preempt19-21ksoftirqd/123:56:551
81480,0rcu_preempt19-21ksoftirqd/119:58:531
81470,0rcu_preempt3-21ksoftirqd/020:50:050
81470,0rcu_preempt3-21ksoftirqd/020:30:080
81470,0rcu_preempt3-21ksoftirqd/019:58:290
81470,0rcu_preempt3-21ksoftirqd/019:50:010
81470,0rcu_preempt2197-21kworker/0:119:14:590
81470,0rcu_preempt19-21ksoftirqd/123:23:271
81470,0rcu_preempt19-21ksoftirqd/121:00:001
81470,0rcu_preempt19-21ksoftirqd/120:40:031
10050470,0irq/346-484840023431-21meminfo19:35:080
9950460,0irq/345-484840028753-1kworker/1:3H21:16:351
9950460,0irq/345-48484000-21swapper/100:22:371
81460,0rcu_preempt3-21ksoftirqd/019:28:340
81460,0rcu_preempt19-21ksoftirqd/121:09:501
81460,0rcu_preempt19-21ksoftirqd/119:21:421
81460,0rcu_preempt17791-21ping19:45:101
81450,0rcu_preempt54-21kswapd021:48:461
81450,0rcu_preempt19-21ksoftirqd/119:41:341
81450,0rcu_preempt19-21ksoftirqd/119:26:061
81440,0rcu_preempt24693-21taskset19:39:590
81440,0rcu_preempt19-21ksoftirqd/123:30:081
81440,0rcu_preempt19-21ksoftirqd/121:37:431
81440,0rcu_preempt19-21ksoftirqd/119:17:331
81430,0rcu_preempt19-21ksoftirqd/122:25:111
81430,0rcu_preempt19-21ksoftirqd/121:29:431
81430,0rcu_preempt0-21swapper/122:17:591
81420,0rcu_preempt54-21kswapd022:11:251
81420,0rcu_preempt19-21ksoftirqd/120:34:591
9950410,0irq/345-48484003-21ksoftirqd/019:45:060
81410,0rcu_preempt19-21ksoftirqd/123:18:541
81410,0rcu_preempt19-21ksoftirqd/120:25:091
10050410,0irq/346-48484003-21ksoftirqd/019:20:010
81400,0rcu_preempt26269-21ssh22:19:591
81400,0rcu_preempt19-21ksoftirqd/120:49:371
81400,0rcu_preempt19-21ksoftirqd/119:50:041
81400,0rcu_preempt19-21ksoftirqd/119:04:571
81400,0rcu_preempt11275-1kworker/1:1H20:55:091
81400,0rcu_preempt11275-1kworker/1:1H20:55:091
81390,0rcu_preempt19-21ksoftirqd/120:49:551
81390,0rcu_preempt14868-21diskstats19:09:591
81370,0rcu_preempt19-21ksoftirqd/120:31:241
81360,0rcu_preempt19-21ksoftirqd/121:05:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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