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2026-06-27 - 12:18

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 highest latencies:
System rackaslot5s.osadl.org (updated Sat Jun 27, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811420,0rcu_preempt12626-21cyclictest22:47:320
81940,0rcu_preempt19-21ksoftirqd/120:24:141
81880,0rcu_preempt19-21ksoftirqd/100:28:151
81870,0rcu_preempt19-21ksoftirqd/121:23:141
81860,0rcu_preempt19-21ksoftirqd/123:52:411
81830,0rcu_preempt19-21ksoftirqd/121:15:481
81820,0rcu_preempt19-21ksoftirqd/122:34:331
81820,0rcu_preempt19-21ksoftirqd/121:10:251
81780,0rcu_preempt19-21ksoftirqd/123:12:111
81750,0rcu_preempt54-21kswapd022:17:421
81750,0rcu_preempt19-21ksoftirqd/119:24:081
81740,0rcu_preempt3-21ksoftirqd/000:01:420
81740,0rcu_preempt19-21ksoftirqd/122:11:021
81730,0rcu_preempt3-21ksoftirqd/022:33:020
81730,0rcu_preempt19-21ksoftirqd/100:13:251
81700,0rcu_preempt3-21ksoftirqd/023:36:010
81690,0rcu_preempt19-21ksoftirqd/122:48:581
10050690,0irq/346-4848400181ktimersoftd/123:00:161
81670,0rcu_preempt19-21ksoftirqd/121:43:081
81670,0rcu_preempt0-21swapper/122:52:461
10050670,0irq/346-4848400171rcuc/122:14:481
81660,0rcu_preempt3-21ksoftirqd/021:14:260
10050660,0irq/346-484840054-21kswapd022:12:190
81650,0rcu_preempt19-21ksoftirqd/123:59:351
81650,0rcu_preempt19-21ksoftirqd/122:43:551
10050650,0irq/346-484840027764-21ssh21:47:420
10050650,0irq/346-4848400181ktimersoftd/123:32:221
81640,0rcu_preempt3-21ksoftirqd/022:57:430
81640,0rcu_preempt19-21ksoftirqd/123:25:371
10050640,0irq/346-4848400181ktimersoftd/123:17:401
81630,0rcu_preempt1429-21kworker/1:221:48:241
10050630,0irq/346-484840017945-1kworker/0:2H00:27:190
10050630,0irq/346-4848400171rcuc/122:27:321
10050630,0irq/346-4848400171rcuc/122:27:321
10050630,0irq/346-484840013167-1kworker/0:3H23:46:010
81620,0rcu_preempt19-21ksoftirqd/121:36:321
10050620,0irq/346-4848400171rcuc/122:41:251
10050620,0irq/346-4848400171rcuc/122:41:251
10050620,0irq/346-4848400171rcuc/100:35:071
9950610,0irq/345-484840024590-1kworker/0:2H21:46:290
81610,0rcu_preempt54-21kswapd023:38:250
10050610,0irq/346-48484000-21swapper/022:18:120
10050610,0irq/346-48484000-21swapper/021:21:540
9950600,0irq/345-484840026776-21munin-node0
9950600,0irq/345-4848400171rcuc/100:20:231
81600,0rcu_preempt3-21ksoftirqd/021:42:200
81600,0rcu_preempt0-21swapper/121:55:431
10050600,0irq/346-484840025760-1kworker/0:1H23:24:450
10050600,0irq/346-4848400181ktimersoftd/123:12:231
10050600,0irq/346-4848400171rcuc/121:30:211
10050600,0irq/346-4848400171rcuc/100:25:561
9950590,0irq/345-4848400492-1kworker/0:3H00:04:120
9950590,0irq/345-4848400181ktimersoftd/123:48:191
81590,0rcu_preempt19-21ksoftirqd/119:57:411
10050590,0irq/346-48484003797-21ssh21:56:490
10050590,0irq/346-484840028208-21munin-node0
10050590,0irq/346-4848400171rcuc/122:25:501
10050580,0irq/346-484840031545-21ssh22:24:150
81570,0rcu_preempt54-21kswapd022:07:081
81570,0rcu_preempt54-21kswapd022:00:480
81570,0rcu_preempt19-21ksoftirqd/120:17:421
10050570,0irq/346-48484004751-1kworker/0:2H21:27:190
10050570,0irq/346-4848400171rcuc/123:37:421
10050570,0irq/346-4848400111rcuc/023:17:420
10050570,0irq/346-484840010920-1kworker/0:1H23:09:430
9950560,0irq/345-484840019344-1kworker/0:1H21:07:470
9950560,0irq/345-4848400181ktimersoftd/121:18:131
9950560,0irq/345-4848400171rcuc/121:58:501
10050560,0irq/346-48484005143-21ssh00:08:260
10050560,0irq/346-4848400181ktimersoftd/120:12:311
10050560,0irq/346-484840013548-1kworker/0:0H22:39:080
10050560,0irq/346-484840013548-1kworker/0:0H22:39:080
10050560,0irq/346-484840012615-21wc19:07:190
81550,0rcu_preempt9576-21kworker/0:220:42:340
81550,0rcu_preempt3-21ksoftirqd/022:05:530
10050550,0irq/346-484840023133-1kworker/0:0H00:32:300
10050550,0irq/346-4848400171rcuc/123:07:071
9950540,0irq/345-48484000-21swapper/023:31:350
81540,0rcu_preempt19-21ksoftirqd/100:07:301
10050540,0irq/346-484840018100-1kworker/0:1H23:53:170
10050540,0irq/346-48484000-21swapper/019:22:420
10050540,0irq/346-48484000-21swapper/000:12:400
81530,0rcu_preempt3-21ksoftirqd/023:47:380
10050530,0irq/346-484840023133-1kworker/0:0H00:29:090
10050530,0irq/346-4848400171rcuc/123:31:501
10050530,0irq/346-484840010920-1kworker/0:1H23:13:380
10050530,0irq/346-48484000-21swapper/021:35:300
81520,0rcu_preempt3-21ksoftirqd/020:47:430
10050520,0irq/346-48484009704-1kworker/0:3H21:31:210
10050520,0irq/346-484840019023-1kworker/0:1H22:13:250
10050520,0irq/346-4848400171rcuc/100:02:531
9950510,0irq/345-48484000-21swapper/019:52:200
81510,0rcu_preempt3-21ksoftirqd/000:18:190
1262899511,0cyclictest10050irq/346-484840023:42:291
10050510,0irq/346-484840028723-1kworker/0:1H19:57:330
81500,0rcu_preempt19-21ksoftirqd/120:12:191
10050500,0irq/346-4848400171rcuc/121:42:021
9950490,0irq/345-484840015915-21ping19:17:370
81490,0rcu_preempt3-21ksoftirqd/020:12:310
81490,0rcu_preempt26435-21kworker/0:223:02:360
81490,0rcu_preempt19-21ksoftirqd/120:47:381
81490,0rcu_preempt19-21ksoftirqd/120:02:291
10050490,0irq/346-48484009457-1kworker/0:0H20:37:200
10050490,0irq/346-484840016049-1kworker/0:2H20:57:520
10050490,0irq/346-484840013548-1kworker/0:0H22:44:440
9950480,0irq/345-48484000-21swapper/020:02:300
81480,0rcu_preempt3-21ksoftirqd/020:07:310
1262899488,0cyclictest0-21swapper/119:27:351
10050480,0irq/346-4848400171rcuc/120:27:331
81470,0rcu_preempt3-21ksoftirqd/020:22:350
81470,0rcu_preempt19-21ksoftirqd/120:52:441
81470,0rcu_preempt19-21ksoftirqd/120:42:411
81470,0rcu_preempt19-21ksoftirqd/119:32:461
9950460,0irq/345-484840031807-1kworker/0:3H22:28:380
9950460,0irq/345-484840031807-1kworker/0:3H22:28:380
81460,0rcu_preempt3-21ksoftirqd/021:02:300
81460,0rcu_preempt3-21ksoftirqd/020:27:410
81460,0rcu_preempt19-21ksoftirqd/119:39:431
81450,0rcu_preempt3-21ksoftirqd/020:17:390
81450,0rcu_preempt19-21ksoftirqd/119:43:311
81450,0rcu_preempt19-21ksoftirqd/119:19:211
81440,0rcu_preempt8257-21apt-get20:32:311
81440,0rcu_preempt3-21ksoftirqd/020:37:430
81440,0rcu_preempt19-21ksoftirqd/119:12:311
12628994411,0cyclictest1470-21runrttasks20:57:341
81430,0rcu_preempt3-21ksoftirqd/019:13:260
10050430,0irq/346-4848400181ktimersoftd/119:56:451
10050430,0irq/346-484840014403-1kworker/0:0H20:52:440
9950410,0irq/345-484840015915-21ping19:37:380
81410,0rcu_preempt3-21ksoftirqd/019:11:340
81400,0rcu_preempt19-21ksoftirqd/119:47:391
81400,0rcu_preempt1429-21kworker/1:220:40:331
81400,0rcu_preempt12299-1kworker/1:0H19:04:101
81390,0rcu_preempt54-21kswapd019:27:210
81390,0rcu_preempt24922-21ntp_kernel_pll_19:42:510
81390,0rcu_preempt19-21ksoftirqd/121:05:381
81380,0rcu_preempt19-21ksoftirqd/119:07:441
12627993711,0cyclictest15915-21ping19:32:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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