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2026-07-24 - 02:56

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Fri Jul 24, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81850,0rcu_preempt3-21ksoftirqd/023:07:020
81830,0rcu_preempt3-21ksoftirqd/022:55:360
81830,0rcu_preempt3-21ksoftirqd/021:37:080
81770,0rcu_preempt3-21ksoftirqd/021:21:520
81750,0rcu_preempt3-21ksoftirqd/021:36:220
81740,0rcu_preempt3-21ksoftirqd/023:54:160
81740,0rcu_preempt3-21ksoftirqd/022:27:460
81740,0rcu_preempt3-21ksoftirqd/022:00:090
81740,0rcu_preempt18510-21cyclictest23:50:250
81730,0rcu_preempt3-21ksoftirqd/023:05:050
81730,0rcu_preempt3-21ksoftirqd/021:56:340
81720,0rcu_preempt3-21ksoftirqd/023:58:160
81710,0rcu_preempt3-21ksoftirqd/021:46:030
81710,0rcu_preempt3-21ksoftirqd/000:26:110
81690,0rcu_preempt3-21ksoftirqd/000:27:200
81680,0rcu_preempt3-21ksoftirqd/000:17:050
81670,0rcu_preempt19-21ksoftirqd/120:12:241
81670,0rcu_preempt19-21ksoftirqd/100:00:531
81630,0rcu_preempt19-21ksoftirqd/122:15:101
81620,0rcu_preempt3-21ksoftirqd/021:01:540
81620,0rcu_preempt3-21ksoftirqd/019:07:110
81610,0rcu_preempt3-21ksoftirqd/021:02:120
81610,0rcu_preempt3-21ksoftirqd/020:02:050
81610,0rcu_preempt19-21ksoftirqd/100:32:171
81610,0rcu_preempt19-21ksoftirqd/100:19:221
81610,0rcu_preempt12046-21kworker/0:220:47:050
10050610,0irq/346-48484000-21swapper/021:48:520
81600,0rcu_preempt25812-21kworker/0:023:32:160
81600,0rcu_preempt19-21ksoftirqd/123:39:221
81600,0rcu_preempt19-21ksoftirqd/119:07:051
81600,0rcu_preempt0-21swapper/100:29:451
81580,0rcu_preempt3-21ksoftirqd/000:11:460
81580,0rcu_preempt19-21ksoftirqd/123:24:391
81580,0rcu_preempt19-21ksoftirqd/123:03:421
81580,0rcu_preempt19-21ksoftirqd/119:27:271
81570,0rcu_preempt3-21ksoftirqd/000:01:540
81570,0rcu_preempt19-21ksoftirqd/123:26:571
10050570,0irq/346-48484006613-1kworker/0:3H23:00:460
10050570,0irq/346-484840030988-21ssh23:23:240
10050570,0irq/346-48484000-21swapper/021:25:000
81560,0rcu_preempt15397-1kworker/1:1H20:36:541
81560,0rcu_preempt0-21swapper/122:51:591
81560,0rcu_preempt0-21swapper/120:02:171
81560,0rcu_preempt0-21swapper/000:14:530
298952560,0chrt10050irq/346-484840019:40:510
10050560,0irq/346-484840014848-21ssh22:34:200
10050560,0irq/346-48484000-21swapper/022:08:130
81550,0rcu_preempt3-21ksoftirqd/022:42:110
81550,0rcu_preempt19-21ksoftirqd/100:09:271
81540,0rcu_preempt3-21ksoftirqd/022:47:220
81540,0rcu_preempt3-21ksoftirqd/022:37:250
81540,0rcu_preempt3-21ksoftirqd/022:02:130
81540,0rcu_preempt3-21ksoftirqd/021:12:190
81540,0rcu_preempt3-21ksoftirqd/019:47:100
81540,0rcu_preempt19-21ksoftirqd/123:46:101
81540,0rcu_preempt19-21ksoftirqd/123:46:101
81540,0rcu_preempt19-21ksoftirqd/122:09:241
81540,0rcu_preempt19-21ksoftirqd/121:37:191
81540,0rcu_preempt19-21ksoftirqd/119:32:071
81530,0rcu_preempt9453-21kworker/0:123:43:590
81530,0rcu_preempt9453-21kworker/0:123:43:590
81530,0rcu_preempt3-21ksoftirqd/023:27:170
81530,0rcu_preempt3-21ksoftirqd/023:12:110
81530,0rcu_preempt3-21ksoftirqd/023:12:110
81530,0rcu_preempt3-21ksoftirqd/022:12:190
81530,0rcu_preempt0-21swapper/122:45:081
81530,0rcu_preempt0-21swapper/120:07:111
10050530,0irq/346-48484000-21swapper/021:11:250
81520,0rcu_preempt3-21ksoftirqd/020:27:080
81520,0rcu_preempt3-21ksoftirqd/020:07:050
81520,0rcu_preempt3-21ksoftirqd/019:52:210
81520,0rcu_preempt21180-21if_eth220:52:130
81520,0rcu_preempt19-21ksoftirqd/123:53:511
81520,0rcu_preempt0-21swapper/121:11:581
10050520,0irq/346-484840015635-21sendmail-mta00:35:430
10050520,0irq/346-484840014927-1kworker/0:2H19:02:090
81510,0rcu_preempt3-21ksoftirqd/021:27:500
81510,0rcu_preempt3-21ksoftirqd/020:42:180
81510,0rcu_preempt3-21ksoftirqd/020:42:180
81510,0rcu_preempt26257-21grep19:27:280
81510,0rcu_preempt0-21swapper/123:13:591
81510,0rcu_preempt0-21swapper/123:13:591
81510,0rcu_preempt0-21swapper/121:22:061
10050510,0irq/346-484840031943-1kworker/0:2H22:21:580
81500,0rcu_preempt54-21kswapd021:42:201
81500,0rcu_preempt3-21ksoftirqd/022:17:120
81500,0rcu_preempt3-21ksoftirqd/020:38:210
81500,0rcu_preempt3-21ksoftirqd/020:11:550
81490,0rcu_preempt6003-21kworker/u4:223:32:201
81490,0rcu_preempt3-21ksoftirqd/019:57:110
81490,0rcu_preempt3-21ksoftirqd/019:22:210
81480,0rcu_preempt54-21kswapd022:06:151
81480,0rcu_preempt3-21ksoftirqd/023:37:130
81480,0rcu_preempt3-21ksoftirqd/020:32:050
81480,0rcu_preempt3-21ksoftirqd/020:22:190
81480,0rcu_preempt3-21ksoftirqd/020:22:190
81480,0rcu_preempt3-21ksoftirqd/020:16:550
81480,0rcu_preempt31120-21unixbench_multi19:42:310
81480,0rcu_preempt19-21ksoftirqd/121:52:051
81480,0rcu_preempt19-21ksoftirqd/100:25:161
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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