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2026-07-21 - 13:06

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 Jul 21, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811080,0rcu_preempt19-21ksoftirqd/122:47:091
81960,0rcu_preempt19-21ksoftirqd/122:07:501
10050960,0irq/346-484840041ktimersoftd/022:07:150
81890,0rcu_preempt13577-21ping19:57:221
81800,0rcu_preempt4370-21diskmemload23:23:581
81760,0rcu_preempt19-21ksoftirqd/123:57:241
81760,0rcu_preempt19-21ksoftirqd/123:07:111
81750,0rcu_preempt19-21ksoftirqd/121:42:151
81730,0rcu_preempt19-21ksoftirqd/100:07:091
10050720,0irq/346-484840011475-1kworker/0:0H22:22:010
81710,0rcu_preempt7160-21kworker/1:021:50:521
81710,0rcu_preempt27265-1kworker/1:1H00:18:421
81700,0rcu_preempt19-21ksoftirqd/123:19:581
81690,0rcu_preempt17567-21ssh21:19:491
81680,0rcu_preempt3-21ksoftirqd/022:27:090
81680,0rcu_preempt19-21ksoftirqd/122:06:571
81670,0rcu_preempt19-21ksoftirqd/121:32:201
81650,0rcu_preempt19-21ksoftirqd/100:23:051
81640,0rcu_preempt19-21ksoftirqd/122:42:221
81640,0rcu_preempt19-21ksoftirqd/122:27:541
81640,0rcu_preempt19-21ksoftirqd/120:57:141
81630,0rcu_preempt19-21ksoftirqd/121:07:161
29776996319,0cyclictest16654-21apt-get21:52:080
81620,0rcu_preempt3-21ksoftirqd/023:15:060
81620,0rcu_preempt19-21ksoftirqd/123:34:351
81610,0rcu_preempt3-21ksoftirqd/023:01:300
29776996116,0cyclictest27266-1kworker/0:0H00:16:330
81600,0rcu_preempt19-21ksoftirqd/121:52:091
29776996019,0cyclictest6476-1kworker/0:3H22:17:580
29776995919,0cyclictest27880-21ssh22:02:370
81580,0rcu_preempt3-21ksoftirqd/021:08:260
81580,0rcu_preempt19-21ksoftirqd/123:30:151
81580,0rcu_preempt19-21ksoftirqd/122:36:461
81570,0rcu_preempt19-21ksoftirqd/123:43:151
81570,0rcu_preempt19-21ksoftirqd/123:38:551
81570,0rcu_preempt19-21ksoftirqd/123:12:091
81570,0rcu_preempt19-21ksoftirqd/123:05:381
29776995621,0cyclictest29324-21apt-get21:32:090
81550,0rcu_preempt3-21ksoftirqd/019:52:220
81550,0rcu_preempt19-21ksoftirqd/122:12:181
81550,0rcu_preempt19-21ksoftirqd/120:46:571
29776995528,0cyclictest20323-21apt-get00:07:080
29776995519,0cyclictest25427-21ssh23:06:390
29776995518,0cyclictest10109-21ssh23:56:510
29776995518,0cyclictest10109-21ssh23:56:510
81540,0rcu_preempt19-21ksoftirqd/120:22:231
81540,0rcu_preempt19-21ksoftirqd/120:22:231
81540,0rcu_preempt19-21ksoftirqd/100:35:361
29776995416,0cyclictest24054-1kworker/0:1H21:59:150
81530,0rcu_preempt19-21ksoftirqd/123:52:371
81530,0rcu_preempt19-21ksoftirqd/123:52:371
81530,0rcu_preempt19-21ksoftirqd/123:47:231
81530,0rcu_preempt19-21ksoftirqd/122:37:131
29776995318,0cyclictest12034-21sort21:47:150
29776995318,0cyclictest11448-21ssh22:52:150
81520,0rcu_preempt1350-21lldpd19:47:101
29776995218,0cyclictest450-21taskset22:41:210
29776995215,0cyclictest0-21swapper/021:13:200
29776995215,0cyclictest0-21swapper/021:02:100
29776995215,0cyclictest0-21swapper/021:02:100
29776995213,0cyclictest0-21swapper/023:42:160
10050520,0irq/346-484840054-21kswapd022:21:581
81510,0rcu_preempt19-21ksoftirqd/121:31:061
81510,0rcu_preempt16555-21cat22:57:191
29776995121,0cyclictest0-21swapper/021:23:200
29776995119,0cyclictest12530-21ssh23:26:210
29776995117,0cyclictest13133-21awk00:32:170
29776995116,0cyclictest10723-21ssh23:57:120
29776995110,0cyclictest0-21swapper/021:41:290
81500,0rcu_preempt3-21ksoftirqd/019:51:560
81500,0rcu_preempt19-21ksoftirqd/121:16:571
29776995016,0cyclictest511-1kworker/0:3H00:31:240
29776995016,0cyclictest11982-1kworker/0:0H21:17:150
29776995013,0cyclictest0-21swapper/022:51:000
13250500,0irq/301-48020000-21swapper/119:42:111
81490,0rcu_preempt3-21ksoftirqd/000:24:270
29776994919,0cyclictest22983-21runrttasks20:22:250
29776994919,0cyclictest22983-21runrttasks20:22:250
29776994918,0cyclictest1470-21runrttasks22:15:370
29776994918,0cyclictest1058-21latency_hist20:56:570
29776994915,0cyclictest0-21swapper/019:07:210
29776994914,0cyclictest6215-21taskset23:19:320
29776994913,0cyclictest10050irq/346-484840023:48:410
29776994913,0cyclictest0-21swapper/021:46:510
81480,0rcu_preempt3-21ksoftirqd/023:07:150
81480,0rcu_preempt3-21ksoftirqd/019:57:270
81480,0rcu_preempt26138-21ps20:32:230
81480,0rcu_preempt24604-21df_abs21:27:120
29776994819,0cyclictest16361-21munin-node0
29776994818,0cyclictest2112-21proc_pri22:42:230
29776994816,0cyclictest31839-21cron20:51:560
29776994813,0cyclictest18505-21munin-node0
9950470,0irq/345-484840011814-1kworker/1:3H19:52:131
81470,0rcu_preempt606-21ping19:41:570
81470,0rcu_preempt4370-21diskmemload00:05:491
81470,0rcu_preempt3-21ksoftirqd/023:37:200
81470,0rcu_preempt3-21ksoftirqd/023:28:040
81470,0rcu_preempt3-21ksoftirqd/022:32:160
81470,0rcu_preempt3-21ksoftirqd/020:17:110
81470,0rcu_preempt3-21ksoftirqd/000:17:270
81470,0rcu_preempt32137-21meminfo19:12:190
81470,0rcu_preempt19-21ksoftirqd/100:12:101
29776994719,0cyclictest3-21ksoftirqd/019:27:080
81460,0rcu_preempt3-21ksoftirqd/020:28:270
81460,0rcu_preempt3-21ksoftirqd/020:02:290
81460,0rcu_preempt19569-21ps20:12:250
81460,0rcu_preempt19-21ksoftirqd/121:02:161
81460,0rcu_preempt19-21ksoftirqd/121:02:161
81460,0rcu_preempt19-21ksoftirqd/120:27:111
81460,0rcu_preempt19-21ksoftirqd/100:28:511
10050460,0irq/346-484840054-21kswapd021:59:201
10050460,0irq/346-484840032727-1kworker/1:2H19:16:561
81450,0rcu_preempt28455-21df_abs19:02:110
81450,0rcu_preempt28269-21apt-get19:02:081
10050450,0irq/346-484840024086-21ssh21:26:561
10050450,0irq/346-48484001907-21ssh21:37:101
10050450,0irq/346-48484001536-1kworker/1:3H22:17:401
81440,0rcu_preempt3-21ksoftirqd/020:37:240
81440,0rcu_preempt3-21ksoftirqd/019:22:190
81440,0rcu_preempt19-21ksoftirqd/120:17:151
81440,0rcu_preempt19-21ksoftirqd/119:07:081
29776994418,0cyclictest606-21ping19:32:090
29776994416,0cyclictest0-21swapper/020:42:220
81430,0rcu_preempt3-21ksoftirqd/020:07:220
81430,0rcu_preempt13577-21ping20:07:191
29776994319,0cyclictest606-21ping19:17:080
85262420,0chrt10050irq/346-484840019:38:350
81420,0rcu_preempt19-21ksoftirqd/120:52:171
81420,0rcu_preempt19-21ksoftirqd/120:12:181
29776994221,0cyclictest1231-21apt-get20:57:080
81410,0rcu_preempt0-21swapper/120:37:181
9950400,0irq/345-484840015848-21sort20:02:171
81400,0rcu_preempt19-21ksoftirqd/122:52:111
81400,0rcu_preempt19-21ksoftirqd/120:32:141
81390,0rcu_preempt29117-21iwlist20:42:151
81380,0rcu_preempt7160-21kworker/1:019:27:071
81370,0rcu_preempt19-21ksoftirqd/119:37:201
81360,0rcu_preempt19-21ksoftirqd/119:33:271
81360,0rcu_preempt19-21ksoftirqd/119:21:371
81350,0rcu_preempt19-21ksoftirqd/119:26:431
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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