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2026-08-17 - 13:08

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 Mon Aug 17, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811240,0rcu_preempt3-21ksoftirqd/021:10:180
811090,0rcu_preempt19-21ksoftirqd/123:10:091
81810,0rcu_preempt19-21ksoftirqd/123:41:051
81810,0rcu_preempt19-21ksoftirqd/100:35:581
81790,0rcu_preempt19-21ksoftirqd/121:13:441
81770,0rcu_preempt24742-21kworker/1:020:24:141
81770,0rcu_preempt19-21ksoftirqd/120:19:031
81770,0rcu_preempt19-21ksoftirqd/120:14:431
81770,0rcu_preempt19-21ksoftirqd/119:27:181
81760,0rcu_preempt19-21ksoftirqd/120:02:441
81760,0rcu_preempt19-21ksoftirqd/119:35:421
81760,0rcu_preempt19-21ksoftirqd/119:23:261
81760,0rcu_preempt19-21ksoftirqd/100:22:481
81750,0rcu_preempt25589-21diskmemload23:22:201
81750,0rcu_preempt19-21ksoftirqd/120:25:331
81750,0rcu_preempt19-21ksoftirqd/120:05:241
81750,0rcu_preempt19-21ksoftirqd/119:40:171
81750,0rcu_preempt19-21ksoftirqd/100:03:441
81750,0rcu_preempt0-21swapper/121:30:341
81750,0rcu_preempt0-21swapper/100:17:211
81740,0rcu_preempt24742-21kworker/1:022:06:161
81740,0rcu_preempt19-21ksoftirqd/122:51:201
81740,0rcu_preempt19-21ksoftirqd/122:43:021
81740,0rcu_preempt19-21ksoftirqd/119:46:291
81740,0rcu_preempt19-21ksoftirqd/119:29:521
81740,0rcu_preempt19-21ksoftirqd/100:30:051
81740,0rcu_preempt19-21ksoftirqd/100:12:251
81740,0rcu_preempt11610-21ssh21:27:531
81730,0rcu_preempt19-21ksoftirqd/123:59:011
81730,0rcu_preempt19-21ksoftirqd/123:59:011
81730,0rcu_preempt19-21ksoftirqd/123:37:491
81730,0rcu_preempt19-21ksoftirqd/123:03:561
81730,0rcu_preempt19-21ksoftirqd/122:36:131
81730,0rcu_preempt19-21ksoftirqd/122:34:331
81730,0rcu_preempt19-21ksoftirqd/122:29:201
81730,0rcu_preempt19-21ksoftirqd/122:10:251
81730,0rcu_preempt19-21ksoftirqd/121:48:291
81730,0rcu_preempt19-21ksoftirqd/121:18:521
81730,0rcu_preempt19-21ksoftirqd/120:30:201
81730,0rcu_preempt19-21ksoftirqd/119:58:031
81720,0rcu_preempt25796-21ssh22:47:271
81720,0rcu_preempt19-21ksoftirqd/121:49:451
81720,0rcu_preempt19-21ksoftirqd/121:43:251
81720,0rcu_preempt19-21ksoftirqd/119:16:181
81720,0rcu_preempt1445-21runrttasks23:48:591
81710,0rcu_preempt19-21ksoftirqd/123:27:371
81710,0rcu_preempt19-21ksoftirqd/123:18:131
81710,0rcu_preempt19-21ksoftirqd/122:16:311
81710,0rcu_preempt19-21ksoftirqd/122:00:301
81710,0rcu_preempt19-21ksoftirqd/121:36:181
81710,0rcu_preempt19-21ksoftirqd/121:05:381
81710,0rcu_preempt19-21ksoftirqd/100:05:451
81700,0rcu_preempt7106-21ssh21:55:271
81700,0rcu_preempt54-21kswapd019:51:511
81700,0rcu_preempt19-21ksoftirqd/123:04:441
81700,0rcu_preempt19-21ksoftirqd/122:57:591
81700,0rcu_preempt19-21ksoftirqd/121:20:271
81700,0rcu_preempt19-21ksoftirqd/120:53:241
81690,0rcu_preempt4294-21ssh23:30:491
81690,0rcu_preempt19-21ksoftirqd/123:54:401
81690,0rcu_preempt19-21ksoftirqd/122:20:491
81690,0rcu_preempt19-21ksoftirqd/120:39:561
81680,0rcu_preempt19-21ksoftirqd/120:59:251
81680,0rcu_preempt19-21ksoftirqd/120:38:301
81670,0rcu_preempt19-21ksoftirqd/120:59:531
81670,0rcu_preempt19-21ksoftirqd/119:09:451
81670,0rcu_preempt19-21ksoftirqd/100:25:161
81660,0rcu_preempt19-21ksoftirqd/120:44:571
81630,0rcu_preempt25589-21diskmemload23:25:080
81630,0rcu_preempt23002-21kernelversion23:50:060
81600,0rcu_preempt3-21ksoftirqd/022:28:450
81600,0rcu_preempt25589-21diskmemload22:59:580
81590,0rcu_preempt3-21ksoftirqd/023:11:480
10050580,0irq/346-484840012256-1kworker/0:0H00:20:150
81570,0rcu_preempt3-21ksoftirqd/023:56:160
81570,0rcu_preempt3-21ksoftirqd/023:56:160
81570,0rcu_preempt3-21ksoftirqd/021:51:320
10050550,0irq/346-484840054-21kswapd000:33:550
10050550,0irq/346-484840025386-21runrttasks22:46:550
10050550,0irq/346-484840025278-1kworker/0:1H21:15:400
81540,0rcu_preempt54-21kswapd022:43:320
10050540,0irq/346-4848400836-21rngd00:38:570
10050540,0irq/346-484840054-21kswapd023:39:590
10050540,0irq/346-484840054-21kswapd023:33:280
10050540,0irq/346-484840054-21kswapd022:52:160
10050540,0irq/346-484840054-21kswapd021:47:490
10050540,0irq/346-484840054-21kswapd021:42:160
10050540,0irq/346-484840054-21kswapd021:23:130
10050540,0irq/346-484840010018-1kworker/0:2H23:36:570
10050530,0irq/346-484840054-21kswapd000:28:530
81520,0rcu_preempt9950irq/345-484840020:50:020
10050520,0irq/346-484840054-21kswapd023:49:230
10050520,0irq/346-484840054-21kswapd021:59:160
10050520,0irq/346-484840054-21kswapd000:07:480
10050510,0irq/346-484840054-21kswapd023:21:410
10050510,0irq/346-484840054-21kswapd022:10:220
10050510,0irq/346-484840018507-21tail20:45:110
10050510,0irq/346-484840012256-1kworker/0:0H00:12:420
10050500,0irq/346-48484008711-21http_loadtime21:25:040
10050500,0irq/346-484840054-21kswapd023:18:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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