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2026-01-10 - 22:24

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 Sat Jan 10, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811130,0rcu_preempt13495-21sh12:39:371
811130,0rcu_preempt0-21swapper/110:04:521
811100,0rcu_preempt19-21ksoftirqd/111:45:191
811090,0rcu_preempt19-21ksoftirqd/109:27:181
811080,0rcu_preempt27036-21ssh10:42:081
811080,0rcu_preempt19-21ksoftirqd/110:24:501
811070,0rcu_preempt485-21ssh11:53:401
811070,0rcu_preempt485-21ssh11:53:401
811060,0rcu_preempt19-21ksoftirqd/112:10:311
811060,0rcu_preempt19-21ksoftirqd/112:08:511
811060,0rcu_preempt19-21ksoftirqd/110:17:211
811060,0rcu_preempt0-21swapper/112:04:281
811060,0rcu_preempt0-21swapper/112:04:281
811060,0rcu_preempt0-21swapper/108:16:111
811050,0rcu_preempt26632-21apt-get12:20:091
811050,0rcu_preempt19-21ksoftirqd/110:12:361
811050,0rcu_preempt0-21swapper/110:29:531
811040,0rcu_preempt54-21kswapd011:40:291
811040,0rcu_preempt19-21ksoftirqd/111:35:031
811040,0rcu_preempt19-21ksoftirqd/110:55:181
811040,0rcu_preempt19-21ksoftirqd/110:50:191
811040,0rcu_preempt19-21ksoftirqd/110:34:221
811040,0rcu_preempt19-21ksoftirqd/110:05:261
811040,0rcu_preempt19-21ksoftirqd/109:41:341
811020,0rcu_preempt19-21ksoftirqd/112:27:011
811020,0rcu_preempt19-21ksoftirqd/109:36:331
811010,0rcu_preempt19-21ksoftirqd/109:20:451
81980,0rcu_preempt32422-21kworker/1:009:53:551
81980,0rcu_preempt19-21ksoftirqd/109:58:221
81980,0rcu_preempt19-21ksoftirqd/108:22:411
81970,0rcu_preempt19-21ksoftirqd/111:29:161
81960,0rcu_preempt19-21ksoftirqd/111:58:151
81960,0rcu_preempt0-21swapper/111:18:581
81960,0rcu_preempt0-21swapper/111:18:581
81950,0rcu_preempt19-21ksoftirqd/110:45:511
81950,0rcu_preempt19-21ksoftirqd/108:46:311
81940,0rcu_preempt19-21ksoftirqd/109:10:101
81930,0rcu_preempt54-21kswapd011:05:541
81930,0rcu_preempt19-21ksoftirqd/111:01:181
81930,0rcu_preempt19-21ksoftirqd/109:18:091
81910,0rcu_preempt19-21ksoftirqd/112:31:441
81910,0rcu_preempt19-21ksoftirqd/112:16:501
81910,0rcu_preempt19-21ksoftirqd/111:22:181
81890,0rcu_preempt21850-1kworker/1:1H10:36:561
81870,0rcu_preempt19-21ksoftirqd/111:33:581
81870,0rcu_preempt19-21ksoftirqd/109:45:461
81860,0rcu_preempt19-21ksoftirqd/107:59:171
81860,0rcu_preempt19-21ksoftirqd/107:59:171
81850,0rcu_preempt19-21ksoftirqd/109:30:311
81840,0rcu_preempt27886-21ping07:20:291
81810,0rcu_preempt12084-21apt-get08:10:091
81800,0rcu_preempt19-21ksoftirqd/111:10:181
81790,0rcu_preempt19-21ksoftirqd/108:00:221
81780,0rcu_preempt19-21ksoftirqd/107:35:241
81770,0rcu_preempt19-21ksoftirqd/107:25:011
81760,0rcu_preempt19-21ksoftirqd/108:09:531
81750,0rcu_preempt27886-21ping07:40:101
81750,0rcu_preempt19-21ksoftirqd/108:30:311
81750,0rcu_preempt19-21ksoftirqd/108:29:581
81730,0rcu_preempt19-21ksoftirqd/107:15:231
81720,0rcu_preempt19-21ksoftirqd/108:42:481
81720,0rcu_preempt19-21ksoftirqd/108:42:481
81710,0rcu_preempt3-21ksoftirqd/011:38:570
81710,0rcu_preempt19-21ksoftirqd/109:07:031
81710,0rcu_preempt19-21ksoftirqd/108:59:241
81710,0rcu_preempt0-21swapper/107:50:101
81700,0rcu_preempt19-21ksoftirqd/108:35:211
81700,0rcu_preempt0-21swapper/108:54:591
81690,0rcu_preempt19-21ksoftirqd/107:48:501
81680,0rcu_preempt3-21ksoftirqd/012:06:420
81680,0rcu_preempt3-21ksoftirqd/011:16:370
81680,0rcu_preempt3-21ksoftirqd/011:16:370
10050680,0irq/346-48484000-21swapper/012:17:080
81670,0rcu_preempt3-21ksoftirqd/012:38:590
81670,0rcu_preempt3-21ksoftirqd/010:48:540
81670,0rcu_preempt19-21ksoftirqd/107:10:091
81670,0rcu_preempt19-21ksoftirqd/107:10:091
81660,0rcu_preempt3-21ksoftirqd/011:13:270
81650,0rcu_preempt3-21ksoftirqd/011:02:290
81650,0rcu_preempt19-21ksoftirqd/109:01:531
81640,0rcu_preempt19-21ksoftirqd/107:30:151
81630,0rcu_preempt3-21ksoftirqd/009:14:340
81610,0rcu_preempt3-21ksoftirqd/012:00:140
81610,0rcu_preempt3-21ksoftirqd/012:00:140
81610,0rcu_preempt3-21ksoftirqd/010:34:570
81610,0rcu_preempt3-21ksoftirqd/009:37:070
10050580,0irq/346-484840026185-21php-cgi07:14:370
10050580,0irq/346-484840026185-21php-cgi07:14:370
81560,0rcu_preempt3-21ksoftirqd/011:59:320
10050540,0irq/346-48484000-21swapper/011:32:520
81530,0rcu_preempt3-21ksoftirqd/007:06:190
2459799532,0cyclictest27886-21ping07:40:270
10050510,0irq/346-4848400851-21rngd09:40:160
10050510,0irq/346-484840029179-1kworker/0:1H12:24:200
10050510,0irq/346-48484000-21swapper/009:31:390
10050500,0irq/346-484840032748-21munin-node0
10050500,0irq/346-484840017570-21ssh12:10:250
10050500,0irq/346-484840011915-1kworker/0:2H10:40:170
10050490,0irq/346-484840029326-1kworker/0:2H10:13:040
10050480,0irq/346-48484009414-1kworker/0:2H10:57:100
10050480,0irq/346-484840054-21kswapd008:20:010
10050480,0irq/346-48484004291-1kworker/0:1H09:46:440
10050480,0irq/346-484840012240-21ssh09:22:220
10050480,0irq/346-48484000-21swapper/010:36:510
10050470,0irq/346-48484000-21swapper/011:07:130
10050470,0irq/346-48484000-21swapper/010:25:360
9950460,0irq/345-484840022734-21ssh10:05:200
9950460,0irq/345-48484000-21swapper/011:20:010
10050460,0irq/346-48484006709-1kworker/0:2H09:19:590
10050460,0irq/346-484840014301-1kworker/0:0H09:56:460
10050450,0irq/346-484840018186-1kworker/0:2H08:40:040
10050450,0irq/346-484840018186-1kworker/0:2H08:40:040
10050450,0irq/346-484840014301-1kworker/0:0H10:01:350
10050450,0irq/346-48484000-21swapper/010:18:090
9950440,0irq/345-484840016739-1kworker/0:1H09:28:170
24597994411,0cyclictest27886-21ping07:28:300
10050440,0irq/346-48484005458-21munin-node0
10050440,0irq/346-484840027886-21ping07:40:000
10050440,0irq/346-4848400210442sleep011:41:050
10050440,0irq/346-48484000-21swapper/011:49:360
10050440,0irq/346-48484000-21swapper/008:10:260
10050430,0irq/346-48484002780-21ssh10:50:210
9950420,0irq/345-484840030137-21munin-node0
9950420,0irq/345-484840030137-21munin-node0
81420,0rcu_preempt5293-21wc12:30:290
2459799422,0cyclictest8448-21ping08:00:460
10050420,0irq/346-48484007292-21ssh09:50:140
1599410,0migration/024860-21runrttasks08:47:270
10050410,0irq/346-48484004586-21ssh10:20:050
10050410,0irq/346-484840018146-21taskset08:26:050
2459799402,0cyclictest27886-21ping07:21:210
10050400,0irq/346-48484007536-21runrttasks07:55:170
10050400,0irq/346-48484007536-21runrttasks07:55:170
10050400,0irq/346-48484000-21swapper/008:39:590
2459799394,0cyclictest27886-21ping07:31:230
1599390,0migration/010873-21if_eth108:05:190
10050390,0irq/346-484840013241-1kworker/0:1H08:15:190
68502380,0sleep06655-1kworker/0:2H07:53:330
53232380,0chrt3374-1kworker/0:1H07:49:430
1599380,0migration/027083-21df08:55:120
10050380,0irq/346-484840026746-21ls08:54:590
9950370,0irq/345-48484000-21swapper/009:05:130
10050370,0irq/346-484840023975-21ls07:05:241
9950360,0irq/345-48484000-21swapper/008:30:220
10050350,0irq/346-484840028066-1kworker/0:2H09:00:010
10050350,0irq/346-484840025883-1kworker/0:3H07:16:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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