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2026-03-06 - 14:01

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Fri Mar 06, 2026 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811060,0rcu_preempt10757-21diskmemload22:29:370
81900,0rcu_preempt19-21ksoftirqd/123:59:081
81850,0rcu_preempt26701-1kworker/1:2H22:34:311
10050840,0irq/346-484840054-21kswapd022:54:190
10050780,0irq/346-484840054-21kswapd023:41:270
10050750,0irq/346-484840030288-1kworker/0:0H22:01:510
10050740,0irq/346-484840054-21kswapd021:21:580
3748997321,0cyclictest29619-1kworker/0:2H23:09:580
10050730,0irq/346-484840029089-1kworker/0:2H00:34:110
10050730,0irq/346-484840020405-1kworker/0:2H21:55:210
81720,0rcu_preempt10757-21diskmemload22:34:210
10050720,0irq/346-484840029089-1kworker/0:2H00:15:450
10050720,0irq/346-484840026159-1kworker/0:2H23:36:320
10050720,0irq/346-484840024152-1kworker/0:0H00:06:490
81710,0rcu_preempt3-21ksoftirqd/021:29:360
81700,0rcu_preempt3-21ksoftirqd/020:49:310
10050700,0irq/346-48484005616-1kworker/0:3H21:37:420
81680,0rcu_preempt3-21ksoftirqd/019:49:300
10050680,0irq/346-48484007119-1kworker/0:2H23:18:140
10050680,0irq/346-484840013515-1kworker/0:1H00:10:500
81670,0rcu_preempt3-21ksoftirqd/022:09:290
81670,0rcu_preempt3-21ksoftirqd/000:29:250
10050670,0irq/346-484840018267-1kworker/0:0H21:16:140
81660,0rcu_preempt14503-21apt-get23:24:220
81650,0rcu_preempt3-21ksoftirqd/021:04:320
81650,0rcu_preempt30100-21cat20:29:090
81650,0rcu_preempt15464-21df_inode22:19:250
81640,0rcu_preempt3-21ksoftirqd/021:24:270
81630,0rcu_preempt3-21ksoftirqd/022:06:560
81630,0rcu_preempt0-21swapper/023:55:580
10050630,0irq/346-48484006548-1kworker/0:0H00:21:410
81620,0rcu_preempt7630-21apt-get20:59:190
81620,0rcu_preempt19-21ksoftirqd/122:04:311
81610,0rcu_preempt851-21rngd23:05:540
81610,0rcu_preempt3-21ksoftirqd/023:30:020
3748996117,0cyclictest0-21swapper/023:44:090
10050610,0irq/346-484840027008-21unixbench_multi21:24:391
10050610,0irq/346-484840012066-1kworker/0:1H23:23:450
81600,0rcu_preempt18665-21apt-get19:54:200
81590,0rcu_preempt6726-21apt-get23:49:210
81590,0rcu_preempt54-21kswapd021:52:570
81590,0rcu_preempt3-21ksoftirqd/019:59:190
81570,0rcu_preempt3-21ksoftirqd/022:59:300
81570,0rcu_preempt3-21ksoftirqd/019:09:320
3748995724,0cyclictest11828-21taskset00:26:590
3748995721,0cyclictest9859-1kworker/0:0H22:49:110
3748995720,0cyclictest9859-1kworker/0:0H22:47:320
3748995623,0cyclictest20441-21munin-node0
3748995616,0cyclictest0-21swapper/021:39:390
81550,0rcu_preempt3-21ksoftirqd/020:44:260
81550,0rcu_preempt19-21ksoftirqd/119:38:221
3748995531,0cyclictest7033-21ping19:29:190
3748995524,0cyclictest24762-1kworker/0:2H20:14:270
10050550,0irq/346-48484000-21swapper/022:16:490
81540,0rcu_preempt3-21ksoftirqd/020:34:340
81540,0rcu_preempt3-21ksoftirqd/020:34:340
3748995426,0cyclictest2444-21apt-get22:39:190
3748995426,0cyclictest0-21swapper/020:19:380
3748995423,0cyclictest13515-1kworker/0:1H23:59:220
3748995422,0cyclictest13419-21runrttasks21:11:080
81530,0rcu_preempt3-21ksoftirqd/020:54:390
81530,0rcu_preempt3-21ksoftirqd/019:34:400
81530,0rcu_preempt19-21ksoftirqd/120:24:201
81530,0rcu_preempt19-21ksoftirqd/100:17:161
3748995321,0cyclictest5714-21dropbear19:14:220
81520,0rcu_preempt31336-1kworker/0:0H20:39:300
81520,0rcu_preempt19-21ksoftirqd/119:39:181
81520,0rcu_preempt19-21ksoftirqd/119:24:201
3748995222,0cyclictest30017-21idleruntime-cro20:29:080
3748995220,0cyclictest7033-21ping19:24:090
3748995219,0cyclictest7033-21ping19:24:240
81510,0rcu_preempt9950irq/345-484840022:49:551
81510,0rcu_preempt3-21ksoftirqd/019:44:370
81510,0rcu_preempt19-21ksoftirqd/123:37:591
81510,0rcu_preempt19-21ksoftirqd/121:08:521
3748995124,0cyclictest7033-21ping19:39:200
3748995120,0cyclictest13971-21ntp_states21:44:330
3748995120,0cyclictest13971-21ntp_states21:44:330
9950500,0irq/345-484840054-21kswapd020:19:321
81500,0rcu_preempt19-21ksoftirqd/122:56:201
81500,0rcu_preempt19-21ksoftirqd/122:18:271
81500,0rcu_preempt19-21ksoftirqd/121:59:371
81500,0rcu_preempt19-21ksoftirqd/121:29:291
10050500,0irq/346-48484004376-1kworker/1:0H23:49:321
9950490,0irq/345-484840010757-21diskmemload23:42:121
81490,0rcu_preempt19-21ksoftirqd/122:33:531
81490,0rcu_preempt19-21ksoftirqd/121:40:161
3748994919,0cyclictest0-21swapper/020:04:270
3748994919,0cyclictest0-21swapper/020:04:270
3748994918,0cyclictest0-21swapper/020:11:110
81480,0rcu_preempt4319-21ls21:34:371
81480,0rcu_preempt19-21ksoftirqd/123:04:201
81480,0rcu_preempt19-21ksoftirqd/121:22:081
81480,0rcu_preempt19-21ksoftirqd/121:15:091
81470,0rcu_preempt19-21ksoftirqd/122:19:411
81470,0rcu_preempt19-21ksoftirqd/119:44:211
81470,0rcu_preempt19-21ksoftirqd/119:04:241
81470,0rcu_preempt19-21ksoftirqd/100:07:071
81470,0rcu_preempt17687-21ntpq19:49:311
81460,0rcu_preempt19-21ksoftirqd/120:14:081
81460,0rcu_preempt19-21ksoftirqd/119:29:201
81460,0rcu_preempt10757-21diskmemload00:26:161
10050460,0irq/346-48484007033-21ping19:21:341
10050460,0irq/346-484840023948-21ssh21:54:361
81450,0rcu_preempt3-21ksoftirqd/019:04:340
81450,0rcu_preempt2771-21php-cgi22:39:241
81450,0rcu_preempt20325-21apt-get19:59:191
81450,0rcu_preempt19-21ksoftirqd/123:29:181
81450,0rcu_preempt19-21ksoftirqd/123:14:281
81450,0rcu_preempt19-21ksoftirqd/123:00:561
81450,0rcu_preempt19-21ksoftirqd/122:45:521
81450,0rcu_preempt19-21ksoftirqd/122:09:201
81450,0rcu_preempt19-21ksoftirqd/119:09:201
81440,0rcu_preempt19-21ksoftirqd/123:59:201
81440,0rcu_preempt19-21ksoftirqd/100:29:181
10050440,0irq/346-4848400109802chrt23:19:531
81430,0rcu_preempt19-21ksoftirqd/123:27:041
81430,0rcu_preempt19-21ksoftirqd/122:27:471
81430,0rcu_preempt19-21ksoftirqd/121:49:101
81430,0rcu_preempt19-21ksoftirqd/120:44:211
81420,0rcu_preempt19-21ksoftirqd/121:09:191
81410,0rcu_preempt19-21ksoftirqd/120:39:181
81410,0rcu_preempt19-21ksoftirqd/100:19:231
81410,0rcu_preempt19-21ksoftirqd/100:09:491
81400,0rcu_preempt19-21ksoftirqd/120:04:301
81400,0rcu_preempt19-21ksoftirqd/120:04:301
81400,0rcu_preempt19-21ksoftirqd/119:54:191
81400,0rcu_preempt10757-21diskmemload23:12:021
10050400,0irq/346-48484004328-21munin-node1
81390,0rcu_preempt19-21ksoftirqd/123:44:211
81390,0rcu_preempt19-21ksoftirqd/121:44:261
81390,0rcu_preempt19-21ksoftirqd/121:44:261
81390,0rcu_preempt19-21ksoftirqd/120:14:211
81390,0rcu_preempt19-21ksoftirqd/119:14:221
81390,0rcu_preempt19-21ksoftirqd/100:34:291
81380,0rcu_preempt19-21ksoftirqd/120:54:201
81370,0rcu_preempt19-21ksoftirqd/120:59:211
81370,0rcu_preempt19-21ksoftirqd/120:29:221
81360,0rcu_preempt19-21ksoftirqd/120:34:211
81360,0rcu_preempt19-21ksoftirqd/120:34:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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