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2026-01-08 - 16:17

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 Thu Jan 08, 2026 12:43:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811440,0rcu_preempt24467-21diskmemload09:23:061
811440,0rcu_preempt24467-21diskmemload09:23:061
811340,0rcu_preempt8150-1kworker/0:3H12:37:200
811000,0rcu_preempt3-21ksoftirqd/009:25:100
81880,0rcu_preempt19-21ksoftirqd/109:25:041
81850,0rcu_preempt19-21ksoftirqd/111:01:191
81850,0rcu_preempt0-21swapper/110:34:441
81830,0rcu_preempt19-21ksoftirqd/112:34:071
81830,0rcu_preempt0-21swapper/110:47:131
81830,0rcu_preempt0-21swapper/110:34:501
81820,0rcu_preempt24467-21diskmemload12:05:541
81810,0rcu_preempt0-21swapper/110:09:181
81810,0rcu_preempt0-21swapper/110:09:181
81800,0rcu_preempt19-21ksoftirqd/112:38:471
81790,0rcu_preempt24467-21diskmemload11:05:391
209522790,0chrt9950irq/345-484840010:57:120
209522790,0chrt9950irq/345-484840010:57:120
81780,0rcu_preempt24467-21diskmemload11:15:391
81780,0rcu_preempt24467-21diskmemload10:27:531
81780,0rcu_preempt24467-21diskmemload10:27:531
81770,0rcu_preempt24467-21diskmemload12:00:461
81770,0rcu_preempt24467-21diskmemload11:25:511
81770,0rcu_preempt24467-21diskmemload09:53:361
81770,0rcu_preempt24467-21diskmemload09:31:311
81760,0rcu_preempt24467-21diskmemload11:54:211
81760,0rcu_preempt19-21ksoftirqd/111:11:061
81750,0rcu_preempt24467-21diskmemload12:26:261
81740,0rcu_preempt24467-21diskmemload09:55:341
81720,0rcu_preempt24467-21diskmemload11:47:001
81720,0rcu_preempt24467-21diskmemload10:16:231
81720,0rcu_preempt24467-21diskmemload09:45:471
156912720,0sleep19950irq/345-484840009:35:171
81710,0rcu_preempt29737-21kworker/1:009:10:341
81710,0rcu_preempt24467-21diskmemload11:57:001
81710,0rcu_preempt24467-21diskmemload11:43:231
81710,0rcu_preempt24467-21diskmemload10:43:211
81710,0rcu_preempt19782-21ssh11:32:201
81710,0rcu_preempt0-21swapper/111:39:261
81700,0rcu_preempt24467-21diskmemload11:20:301
81700,0rcu_preempt24467-21diskmemload10:51:451
81700,0rcu_preempt24467-21diskmemload10:12:141
81700,0rcu_preempt24467-21diskmemload10:03:101
81700,0rcu_preempt24467-21diskmemload10:03:101
222932700,0sleep19950irq/345-484840010:20:351
81690,0rcu_preempt3-21ksoftirqd/009:37:470
81690,0rcu_preempt3-21ksoftirqd/009:10:580
81690,0rcu_preempt24467-21diskmemload12:15:441
81690,0rcu_preempt24467-21diskmemload10:59:081
81690,0rcu_preempt24467-21diskmemload10:59:081
81680,0rcu_preempt28032-1kworker/0:1H07:45:200
81680,0rcu_preempt24467-21diskmemload12:23:471
81680,0rcu_preempt24467-21diskmemload12:14:151
81680,0rcu_preempt24467-21diskmemload09:19:141
81670,0rcu_preempt3-21ksoftirqd/011:08:560
81670,0rcu_preempt3-21ksoftirqd/010:30:080
81670,0rcu_preempt24467-21diskmemload09:43:551
81670,0rcu_preempt19-21ksoftirqd/108:55:131
81670,0rcu_preempt19-21ksoftirqd/107:20:111
81660,0rcu_preempt3-21ksoftirqd/010:20:170
81650,0rcu_preempt3-21ksoftirqd/010:38:590
81640,0rcu_preempt3-21ksoftirqd/008:59:460
81630,0rcu_preempt3-21ksoftirqd/012:34:000
81620,0rcu_preempt3-21ksoftirqd/012:22:440
81620,0rcu_preempt18522-21cyclictest11:10:440
81620,0rcu_preempt10490-21apt-get10:44:530
9950610,0irq/345-48484009612-1kworker/0:0H10:25:010
9950610,0irq/345-48484009612-1kworker/0:0H10:25:010
81610,0rcu_preempt3-21ksoftirqd/012:25:100
81610,0rcu_preempt3-21ksoftirqd/011:57:340
81610,0rcu_preempt19-21ksoftirqd/107:19:441
81600,0rcu_preempt5657-21ps08:10:111
81600,0rcu_preempt3-21ksoftirqd/011:51:100
81600,0rcu_preempt3-21ksoftirqd/010:50:030
81600,0rcu_preempt3-21ksoftirqd/008:20:020
80292600,0sleep010050irq/346-484840008:19:350
263852600,0sleep010050irq/346-484840007:31:160
81590,0rcu_preempt3-21ksoftirqd/010:13:440
81590,0rcu_preempt3-21ksoftirqd/008:29:560
81580,0rcu_preempt3-21ksoftirqd/012:09:550
81580,0rcu_preempt3-21ksoftirqd/011:40:490
81580,0rcu_preempt3-21ksoftirqd/011:21:510
81580,0rcu_preempt3-21ksoftirqd/011:04:060
81580,0rcu_preempt3-21ksoftirqd/009:55:290
81580,0rcu_preempt3-21ksoftirqd/009:15:370
81580,0rcu_preempt3-21ksoftirqd/008:50:100
81580,0rcu_preempt23275-21apt-get09:44:550
81570,0rcu_preempt3-21ksoftirqd/012:07:580
81570,0rcu_preempt3-21ksoftirqd/011:25:100
81570,0rcu_preempt3-21ksoftirqd/011:17:140
81570,0rcu_preempt3-21ksoftirqd/007:10:020
81560,0rcu_preempt3-21ksoftirqd/011:36:490
81560,0rcu_preempt3-21ksoftirqd/011:32:590
81560,0rcu_preempt23120-1kworker/0:0H07:35:220
81560,0rcu_preempt19-21ksoftirqd/107:50:121
81550,0rcu_preempt54-21kswapd009:39:570
81550,0rcu_preempt4346-21kworker/0:208:05:450
81550,0rcu_preempt3-21ksoftirqd/009:29:550
81540,0rcu_preempt6218-21kworker/0:110:42:280
81540,0rcu_preempt3-21ksoftirqd/010:04:550
81540,0rcu_preempt3-21ksoftirqd/010:04:550
81530,0rcu_preempt7135-21kworker/0:012:00:360
10050530,0irq/346-484840026986-1kworker/0:2H11:44:570
81520,0rcu_preempt3-21ksoftirqd/010:18:210
81520,0rcu_preempt3-21ksoftirqd/007:50:010
81520,0rcu_preempt19-21ksoftirqd/108:24:311
81520,0rcu_preempt0-21swapper/107:54:541
81510,0rcu_preempt3-21ksoftirqd/009:50:190
81510,0rcu_preempt19-21ksoftirqd/107:09:581
110412510,0sleep010050irq/346-484840008:26:330
10050510,0irq/346-4848400811-21rngd12:18:390
81500,0rcu_preempt3-21ksoftirqd/010:03:220
81500,0rcu_preempt3-21ksoftirqd/010:03:220
81500,0rcu_preempt19-21ksoftirqd/108:25:171
9950490,0irq/345-484840021797-21ping07:24:560
81490,0rcu_preempt3-21ksoftirqd/009:24:380
81490,0rcu_preempt3-21ksoftirqd/009:24:380
81490,0rcu_preempt19-21ksoftirqd/108:06:361
18523994912,0cyclictest0-21swapper/008:39:460
81480,0rcu_preempt3-21ksoftirqd/008:00:080
81480,0rcu_preempt3-21ksoftirqd/007:58:500
81480,0rcu_preempt19-21ksoftirqd/107:40:141
81480,0rcu_preempt19-21ksoftirqd/107:40:141
9950470,0irq/345-4848400171rcuc/107:39:461
81470,0rcu_preempt3-21ksoftirqd/008:55:020
81470,0rcu_preempt21797-21ping07:19:460
81470,0rcu_preempt19-21ksoftirqd/108:39:461
81470,0rcu_preempt19-21ksoftirqd/108:19:411
81470,0rcu_preempt18522-21cyclictest07:32:061
81470,0rcu_preempt16419-21apt-get08:44:541
9950460,0irq/345-484840021797-21ping07:29:371
81460,0rcu_preempt3-21ksoftirqd/008:09:510
10050460,0irq/346-484840081rcu_preempt08:39:450
81450,0rcu_preempt3-21ksoftirqd/009:05:120
81440,0rcu_preempt3-21ksoftirqd/007:15:120
9950430,0irq/345-48484000-21swapper/108:00:061
81430,0rcu_preempt19-21ksoftirqd/107:46:411
10050430,0irq/346-484840013253-1kworker/0:3H07:05:050
9950420,0irq/345-484840017530-21kernelversion07:05:061
10050420,0irq/346-484840015960-1kworker/0:4H08:45:000
1852399411,0cyclictest21797-21ping07:39:480
1852399411,0cyclictest21797-21ping07:39:480
81390,0rcu_preempt19-21ksoftirqd/108:54:301
81390,0rcu_preempt19-21ksoftirqd/108:35:181
81390,0rcu_preempt1427-21runrttasks09:06:441
81380,0rcu_preempt19-21ksoftirqd/108:30:081
81370,0rcu_preempt19-21ksoftirqd/109:00:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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