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2026-08-15 - 07:33

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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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 Sat Aug 15, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
100501010,0irq/346-4848400836-21rngd23:11:560
811000,0rcu_preempt19-21ksoftirqd/121:55:071
10050920,0irq/346-484840011080-1kworker/0:2H00:14:180
81910,0rcu_preempt54-21kswapd000:24:121
10050910,0irq/346-484840029415-1kworker/0:2H21:50:530
81830,0rcu_preempt3-21ksoftirqd/000:06:500
81830,0rcu_preempt19-21ksoftirqd/122:07:021
81800,0rcu_preempt836-21rngd21:34:491
81800,0rcu_preempt26855-21munin-node1
81790,0rcu_preempt14703-21kworker/1:100:02:191
81770,0rcu_preempt28539-21kworker/0:223:02:200
81750,0rcu_preempt3-21ksoftirqd/023:46:300
81740,0rcu_preempt19-21ksoftirqd/122:45:171
81740,0rcu_preempt19-21ksoftirqd/100:37:221
81740,0rcu_preempt19-21ksoftirqd/100:37:221
81700,0rcu_preempt19-21ksoftirqd/119:20:181
9950690,0irq/345-484840019-21ksoftirqd/123:45:141
81690,0rcu_preempt3-21ksoftirqd/023:57:310
81690,0rcu_preempt3-21ksoftirqd/021:56:220
81690,0rcu_preempt19-21ksoftirqd/122:20:451
81690,0rcu_preempt0-21swapper/122:32:361
81680,0rcu_preempt836-21rngd23:49:570
81680,0rcu_preempt3-21ksoftirqd/023:41:280
81680,0rcu_preempt3-21ksoftirqd/021:46:560
81680,0rcu_preempt3-21ksoftirqd/000:29:340
81670,0rcu_preempt3-21ksoftirqd/023:08:470
81670,0rcu_preempt3-21ksoftirqd/022:33:210
81670,0rcu_preempt3-21ksoftirqd/021:29:170
81670,0rcu_preempt19-21ksoftirqd/122:17:401
81670,0rcu_preempt19-21ksoftirqd/122:17:401
9950660,0irq/345-484840030982-1kworker/0:0H00:33:310
81660,0rcu_preempt3-21ksoftirqd/022:01:030
81660,0rcu_preempt3-21ksoftirqd/021:19:050
81660,0rcu_preempt3-21ksoftirqd/000:20:510
81660,0rcu_preempt19-21ksoftirqd/100:09:431
81650,0rcu_preempt19-21ksoftirqd/123:37:551
81650,0rcu_preempt19-21ksoftirqd/100:11:401
81640,0rcu_preempt19-21ksoftirqd/122:42:161
81630,0rcu_preempt19-21ksoftirqd/121:15:071
81630,0rcu_preempt19-21ksoftirqd/100:16:361
9950620,0irq/345-48484000-21swapper/122:12:141
81610,0rcu_preempt9950irq/345-484840019:27:501
81600,0rcu_preempt19-21ksoftirqd/123:40:351
81600,0rcu_preempt19-21ksoftirqd/123:32:021
81600,0rcu_preempt19-21ksoftirqd/122:51:441
9950590,0irq/345-484840019-21ksoftirqd/123:13:061
81590,0rcu_preempt32083-21apt-get19:54:551
81590,0rcu_preempt19-21ksoftirqd/123:53:191
81590,0rcu_preempt19-21ksoftirqd/122:35:271
10050590,0irq/346-48484008568-1kworker/0:0H23:37:040
81580,0rcu_preempt3-21ksoftirqd/022:10:150
81580,0rcu_preempt19-21ksoftirqd/123:25:141
81570,0rcu_preempt19-21ksoftirqd/121:49:571
81560,0rcu_preempt3-21ksoftirqd/021:35:310
81560,0rcu_preempt19-21ksoftirqd/120:34:101
10050560,0irq/346-484840026906-1kworker/0:3H21:14:360
9950550,0irq/345-484840019-21ksoftirqd/121:24:031
81540,0rcu_preempt3-21ksoftirqd/020:20:060
10050540,0irq/346-484840029130-1kworker/0:2H22:23:280
10050540,0irq/346-484840024337-1kworker/0:1H22:50:030
81530,0rcu_preempt3-21ksoftirqd/022:36:560
81530,0rcu_preempt3-21ksoftirqd/022:15:040
81530,0rcu_preempt3-21ksoftirqd/022:15:040
81530,0rcu_preempt30718-21kworker/0:023:31:130
81530,0rcu_preempt19-21ksoftirqd/122:55:301
81520,0rcu_preempt54-21kswapd019:11:460
81520,0rcu_preempt3476-21kworker/0:121:31:410
81520,0rcu_preempt3-21ksoftirqd/000:00:080
81520,0rcu_preempt24167-21diskmemload23:22:360
81520,0rcu_preempt19-21ksoftirqd/120:24:551
81520,0rcu_preempt19-21ksoftirqd/120:20:031
10050520,0irq/346-484840029320-1kworker/0:0H22:56:000
81510,0rcu_preempt5795-1kworker/1:3H20:14:461
81510,0rcu_preempt5795-1kworker/1:3H20:14:461
81510,0rcu_preempt3-21ksoftirqd/022:29:410
81510,0rcu_preempt24167-21diskmemload00:15:020
10050510,0irq/346-484840024337-1kworker/0:1H22:48:250
10050510,0irq/346-484840019359-1kworker/0:0H22:44:350
81500,0rcu_preempt3-21ksoftirqd/000:34:560
81500,0rcu_preempt3-21ksoftirqd/000:34:560
81500,0rcu_preempt19-21ksoftirqd/121:25:001
81500,0rcu_preempt19-21ksoftirqd/119:44:571
10050500,0irq/346-48484009228-1kworker/0:3H22:06:350
10050500,0irq/346-484840026072-1kworker/0:1H23:25:200
81490,0rcu_preempt3-21ksoftirqd/020:45:020
81490,0rcu_preempt19-21ksoftirqd/123:03:521
81490,0rcu_preempt19-21ksoftirqd/122:25:061
9950480,0irq/345-4848400181ktimersoftd/123:09:171
81480,0rcu_preempt54-21kswapd021:30:041
81480,0rcu_preempt3-21ksoftirqd/020:17:510
81480,0rcu_preempt3-21ksoftirqd/020:04:580
81480,0rcu_preempt3-21ksoftirqd/020:01:090
81480,0rcu_preempt3-21ksoftirqd/020:01:090
81480,0rcu_preempt19-21ksoftirqd/120:15:491
81480,0rcu_preempt19-21ksoftirqd/100:25:101
81470,0rcu_preempt883-21ping20:10:050
81470,0rcu_preempt883-21ping20:10:050
81470,0rcu_preempt3-21ksoftirqd/023:15:020
81470,0rcu_preempt3-21ksoftirqd/021:20:130
81470,0rcu_preempt3-21ksoftirqd/020:40:040
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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