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2026-05-20 - 05:17

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 Wed May 20, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811070,0rcu_preempt3-21ksoftirqd/023:54:070
811000,0rcu_preempt3-21ksoftirqd/021:24:090
10050970,0irq/346-48484003807-1kworker/0:0H23:48:450
10050940,0irq/346-4848400591-21kworker/0:022:46:030
81880,0rcu_preempt19-21ksoftirqd/122:22:261
81850,0rcu_preempt19-21ksoftirqd/123:56:251
81850,0rcu_preempt19-21ksoftirqd/123:13:261
81840,0rcu_preempt54-21kswapd022:49:321
81840,0rcu_preempt0-21swapper/100:33:391
10050830,0irq/346-484840016795-1kworker/0:3H22:21:270
81800,0rcu_preempt19-21ksoftirqd/121:48:291
81800,0rcu_preempt19-21ksoftirqd/121:48:291
81780,0rcu_preempt19-21ksoftirqd/119:33:101
81730,0rcu_preempt3-21ksoftirqd/022:38:190
81720,0rcu_preempt54-21kswapd021:41:540
10050720,0irq/346-484840020821-1kworker/0:0H00:35:350
81710,0rcu_preempt3-21ksoftirqd/022:52:100
81710,0rcu_preempt19-21ksoftirqd/121:35:251
81690,0rcu_preempt3-21ksoftirqd/023:12:530
81680,0rcu_preempt19-21ksoftirqd/122:31:331
81670,0rcu_preempt19-21ksoftirqd/121:44:431
81660,0rcu_preempt19-21ksoftirqd/100:08:331
81650,0rcu_preempt19-21ksoftirqd/123:49:311
81650,0rcu_preempt19-21ksoftirqd/123:41:121
81650,0rcu_preempt19-21ksoftirqd/100:20:461
81640,0rcu_preempt19-21ksoftirqd/122:37:021
81640,0rcu_preempt19-21ksoftirqd/122:11:171
81640,0rcu_preempt19-21ksoftirqd/100:31:451
81630,0rcu_preempt19-21ksoftirqd/123:36:171
81620,0rcu_preempt19-21ksoftirqd/121:19:211
9950610,0irq/345-4848400181ktimersoftd/123:31:561
9950610,0irq/345-4848400181ktimersoftd/121:11:221
9950610,0irq/345-4848400171rcuc/122:27:181
81610,0rcu_preempt3-21ksoftirqd/023:18:090
81610,0rcu_preempt19-21ksoftirqd/123:23:301
81610,0rcu_preempt19-21ksoftirqd/100:26:451
9950600,0irq/345-4848400181ktimersoftd/123:21:441
81600,0rcu_preempt19-21ksoftirqd/122:57:301
81600,0rcu_preempt19-21ksoftirqd/121:24:481
9950590,0irq/345-4848400171rcuc/123:11:091
81590,0rcu_preempt19-21ksoftirqd/121:53:201
81590,0rcu_preempt19-21ksoftirqd/121:31:041
10050590,0irq/346-484840054-21kswapd021:12:520
9950580,0irq/345-4848400181ktimersoftd/123:04:211
9950580,0irq/345-4848400181ktimersoftd/121:14:331
9950580,0irq/345-4848400171rcuc/122:16:431
9950580,0irq/345-4848400171rcuc/121:41:291
9950570,0irq/345-4848400181ktimersoftd/122:38:351
9950570,0irq/345-4848400181ktimersoftd/100:16:051
9950560,0irq/345-4848400181ktimersoftd/122:45:561
9950560,0irq/345-4848400171rcuc/123:01:221
81560,0rcu_preempt3-21ksoftirqd/021:57:320
81550,0rcu_preempt3-21ksoftirqd/022:55:380
81550,0rcu_preempt3-21ksoftirqd/022:14:390
9950540,0irq/345-484840032159-1kworker/0:2H21:32:530
9950540,0irq/345-4848400171rcuc/122:01:161
9950540,0irq/345-4848400171rcuc/100:02:431
81540,0rcu_preempt3-21ksoftirqd/023:13:070
81540,0rcu_preempt3-21ksoftirqd/022:33:160
10050540,0irq/346-484840029022-1kworker/0:0H23:07:300
9950530,0irq/345-4848400171rcuc/122:03:561
9950530,0irq/345-4848400171rcuc/100:05:251
81530,0rcu_preempt3-21ksoftirqd/021:43:290
81530,0rcu_preempt27020-21kworker/0:221:34:330
81530,0rcu_preempt19-21ksoftirqd/119:48:171
81530,0rcu_preempt19218-21kworker/0:220:14:040
81520,0rcu_preempt3-21ksoftirqd/023:58:100
81520,0rcu_preempt3-21ksoftirqd/000:23:210
81520,0rcu_preempt19-21ksoftirqd/120:08:101
81520,0rcu_preempt15068-21kworker/0:222:01:470
81520,0rcu_preempt1470-21runrttasks19:58:520
81510,0rcu_preempt3-21ksoftirqd/022:23:220
81510,0rcu_preempt3-21ksoftirqd/021:20:020
81510,0rcu_preempt3-21ksoftirqd/021:13:390
81510,0rcu_preempt3-21ksoftirqd/020:24:110
81510,0rcu_preempt3-21ksoftirqd/020:08:160
81510,0rcu_preempt3-21ksoftirqd/020:07:370
81510,0rcu_preempt3-21ksoftirqd/019:11:500
81510,0rcu_preempt10025-21diskmemload22:28:250
81500,0rcu_preempt3-21ksoftirqd/023:44:360
81500,0rcu_preempt3-21ksoftirqd/023:44:360
81500,0rcu_preempt3-21ksoftirqd/023:40:230
81500,0rcu_preempt3-21ksoftirqd/020:53:200
81500,0rcu_preempt3-21ksoftirqd/020:18:210
81500,0rcu_preempt2282-21kworker/0:200:17:230
81490,0rcu_preempt3-21ksoftirqd/021:07:580
81490,0rcu_preempt3-21ksoftirqd/000:18:570
81490,0rcu_preempt19-21ksoftirqd/120:53:091
81490,0rcu_preempt19-21ksoftirqd/120:18:171
81480,0rcu_preempt3-21ksoftirqd/023:33:200
81480,0rcu_preempt3-21ksoftirqd/023:30:070
81480,0rcu_preempt3-21ksoftirqd/019:56:390
81480,0rcu_preempt3-21ksoftirqd/000:30:470
81480,0rcu_preempt22479-21meminfo22:58:180
9950470,0irq/345-4848400181ktimersoftd/123:47:151
9950470,0irq/345-4848400181ktimersoftd/123:47:151
81470,0rcu_preempt3-21ksoftirqd/023:23:220
81470,0rcu_preempt3-21ksoftirqd/022:08:460
81470,0rcu_preempt3-21ksoftirqd/020:59:120
81470,0rcu_preempt3-21ksoftirqd/019:03:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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