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2026-04-19 - 09:49

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 highest latencies:
System rackaslot5s.osadl.org (updated Sun Apr 19, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81910,0rcu_preempt3-21ksoftirqd/000:09:240
81820,0rcu_preempt54-21kswapd023:58:550
81810,0rcu_preempt3-21ksoftirqd/023:38:540
81780,0rcu_preempt3-21ksoftirqd/020:13:390
81780,0rcu_preempt3-21ksoftirqd/020:13:390
81780,0rcu_preempt3-21ksoftirqd/000:15:160
81760,0rcu_preempt54-21kswapd022:58:500
81760,0rcu_preempt3-21ksoftirqd/023:07:590
81760,0rcu_preempt3-21ksoftirqd/019:38:370
81760,0rcu_preempt3-21ksoftirqd/000:03:370
81760,0rcu_preempt0-21swapper/000:20:510
81750,0rcu_preempt3-21ksoftirqd/023:33:460
81750,0rcu_preempt3-21ksoftirqd/023:33:460
81740,0rcu_preempt3-21ksoftirqd/022:11:030
81730,0rcu_preempt18184-21ssh22:28:370
10050730,0irq/346-4848400181ktimersoftd/100:30:201
81720,0rcu_preempt3-21ksoftirqd/023:48:050
81720,0rcu_preempt3-21ksoftirqd/023:48:050
81710,0rcu_preempt3-21ksoftirqd/000:23:480
81710,0rcu_preempt19-21ksoftirqd/123:48:581
81700,0rcu_preempt3-21ksoftirqd/020:38:270
81700,0rcu_preempt3-21ksoftirqd/000:36:590
81690,0rcu_preempt3-21ksoftirqd/023:58:210
81690,0rcu_preempt3-21ksoftirqd/023:58:210
81690,0rcu_preempt1470-21runrttasks21:34:231
81680,0rcu_preempt3-21ksoftirqd/023:17:150
81670,0rcu_preempt3-21ksoftirqd/022:57:140
81650,0rcu_preempt3-21ksoftirqd/023:28:550
81650,0rcu_preempt19-21ksoftirqd/120:25:341
81630,0rcu_preempt54-21kswapd000:26:241
81630,0rcu_preempt27159-21users22:03:560
81620,0rcu_preempt9480-21ssh21:46:381
81620,0rcu_preempt32596-21ping19:24:231
81620,0rcu_preempt3-21ksoftirqd/022:38:480
81620,0rcu_preempt3-21ksoftirqd/022:23:380
10050620,0irq/346-484840030169-1kworker/1:2H22:41:001
10050620,0irq/346-484840012611-1kworker/1:2H22:57:201
81610,0rcu_preempt9532-21users22:18:560
81610,0rcu_preempt19-21ksoftirqd/120:16:431
81610,0rcu_preempt19-21ksoftirqd/120:16:431
81610,0rcu_preempt19-21ksoftirqd/119:58:191
81600,0rcu_preempt54-21kswapd021:53:321
81600,0rcu_preempt54-21kswapd021:23:501
81600,0rcu_preempt3-21ksoftirqd/019:13:440
81600,0rcu_preempt3-21ksoftirqd/019:13:440
81600,0rcu_preempt19-21ksoftirqd/120:09:401
81600,0rcu_preempt19-21ksoftirqd/120:04:321
81590,0rcu_preempt19-21ksoftirqd/120:19:251
10050590,0irq/346-48484009387-1kworker/1:1H00:34:031
10050590,0irq/346-484840054-21kswapd022:35:461
10050590,0irq/346-484840054-21kswapd021:59:231
10050590,0irq/346-484840054-21kswapd021:38:481
10050590,0irq/346-484840019671-1kworker/1:1H23:36:011
10050590,0irq/346-484840019671-1kworker/1:1H23:36:011
10050590,0irq/346-484840011719-1kworker/1:2H21:19:021
81580,0rcu_preempt19-21ksoftirqd/120:02:371
81580,0rcu_preempt10301-21ssh22:19:561
81580,0rcu_preempt0-21swapper/123:19:001
10050580,0irq/346-484840027352-1kworker/1:3H23:11:111
10050580,0irq/346-484840027352-1kworker/1:3H23:11:111
10050580,0irq/346-484840012611-1kworker/1:2H22:59:281
81570,0rcu_preempt54-21kswapd023:45:451
81570,0rcu_preempt54-21kswapd023:45:451
10050570,0irq/346-484840054-21kswapd023:25:041
81560,0rcu_preempt54-21kswapd023:58:251
81560,0rcu_preempt54-21kswapd023:58:251
81560,0rcu_preempt54-21kswapd023:14:461
81560,0rcu_preempt5375-21grep19:33:420
81560,0rcu_preempt3-21ksoftirqd/022:13:510
81560,0rcu_preempt3-21ksoftirqd/019:53:390
81560,0rcu_preempt3-21ksoftirqd/019:48:490
81560,0rcu_preempt0-21swapper/119:48:421
10050560,0irq/346-48484005392-1kworker/1:3H22:18:131
10050560,0irq/346-48484002708-1kworker/1:3H22:46:121
81550,0rcu_preempt9736-21kworker/1:123:41:141
81540,0rcu_preempt3-21ksoftirqd/019:29:060
81540,0rcu_preempt19-21ksoftirqd/122:13:261
81540,0rcu_preempt15407-21kworker/u4:023:04:401
10050540,0irq/346-4848400851-21rngd23:12:230
10050540,0irq/346-4848400851-21rngd23:12:230
10050540,0irq/346-484840054-21kswapd023:53:120
10050540,0irq/346-484840054-21kswapd022:28:161
10050540,0irq/346-484840020244-1kworker/1:2H22:31:371
81530,0rcu_preempt3251-21kworker/1:220:28:451
81530,0rcu_preempt19-21ksoftirqd/122:06:041
81530,0rcu_preempt19-21ksoftirqd/121:10:461
81530,0rcu_preempt19-21ksoftirqd/119:18:291
81530,0rcu_preempt0-21swapper/100:22:091
10050530,0irq/346-484840054-21kswapd021:31:140
10050530,0irq/346-484840026901-1kworker/1:2H00:15:281
10050530,0irq/346-484840015931-21ssh00:03:551
10050530,0irq/346-484840014716-1kworker/1:0H23:33:211
10050530,0irq/346-484840012537-21ssh00:01:001
81520,0rcu_preempt3251-21kworker/1:221:00:171
81520,0rcu_preempt11668-21kworker/0:222:43:380
10050520,0irq/346-484840054-21kswapd022:49:530
10050520,0irq/346-48484005159-21runrttasks23:20:340
10050520,0irq/346-484840013096-1kworker/0:1H21:52:510
81510,0rcu_preempt7632-21ssh23:23:380
81510,0rcu_preempt3-21ksoftirqd/022:33:530
81510,0rcu_preempt19-21ksoftirqd/119:28:431
10050510,0irq/346-48484007647-1kworker/1:1H22:52:281
10050510,0irq/346-484840022997-1kworker/0:1H22:02:560
10050510,0irq/346-484840011719-1kworker/1:2H21:15:571
81500,0rcu_preempt3251-21kworker/1:220:41:571
81500,0rcu_preempt19-21ksoftirqd/119:43:431
81500,0rcu_preempt19-21ksoftirqd/119:33:471
81500,0rcu_preempt19-21ksoftirqd/100:13:271
10050500,0irq/346-48484006539-21http_loadtime21:43:450
10050500,0irq/346-48484000-21swapper/021:39:400
81490,0rcu_preempt19-21ksoftirqd/120:52:331
10050490,0irq/346-48484008932-1kworker/1:1H21:50:461
10050490,0irq/346-484840081rcu_preempt21:09:040
10050490,0irq/346-484840054-21kswapd021:03:451
10050490,0irq/346-484840054-21kswapd000:30:000
10050490,0irq/346-484840025479-21ssh21:29:301
10050490,0irq/346-484840018031-1kworker/0:2H21:57:580
10050490,0irq/346-48484000-21swapper/021:25:550
81480,0rcu_preempt3-21ksoftirqd/021:03:450
10050480,0irq/346-484840016666-1kworker/0:0H21:22:360
81470,0rcu_preempt3251-21kworker/1:219:13:341
81470,0rcu_preempt3251-21kworker/1:219:13:341
81470,0rcu_preempt19-21ksoftirqd/120:53:531
81470,0rcu_preempt19-21ksoftirqd/120:46:321
81470,0rcu_preempt19-21ksoftirqd/119:43:281
10050470,0irq/346-48484000-21swapper/021:13:400
81460,0rcu_preempt19-21ksoftirqd/120:34:591
81450,0rcu_preempt3-21ksoftirqd/020:23:520
81450,0rcu_preempt19-21ksoftirqd/119:10:261
10050450,0irq/346-48484000-21swapper/021:36:390
10050440,0irq/346-484840026600-21munin-node0
81430,0rcu_preempt16427-21kworker/0:020:08:530
10050430,0irq/346-484840081rcu_preempt19:18:480
81420,0rcu_preempt30353-21if_eth320:48:470
81420,0rcu_preempt1470-21runrttasks20:03:470
2931599424,0cyclictest32596-21ping19:23:410
81410,0rcu_preempt12941-21ping20:18:450
10050410,0irq/346-484840029993-21ls19:08:470
10050410,0irq/346-48484000-21swapper/020:58:370
1599400,0migration/014666-21taskset20:00:310
10050400,0irq/346-48484009121-21meminfo19:43:550
10050400,0irq/346-48484000-21swapper/020:29:420
81390,0rcu_preempt3-21ksoftirqd/019:03:270
10050390,0irq/346-484840029373-1kworker/0:1H20:48:270
81370,0rcu_preempt19-21ksoftirqd/119:07:361
81370,0rcu_preempt0-21swapper/020:53:520
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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