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2026-04-23 - 01:06

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Wed Apr 22, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811360,0rcu_preempt19-21ksoftirqd/109:51:541
811360,0rcu_preempt19-21ksoftirqd/109:51:541
811180,0rcu_preempt19-21ksoftirqd/109:08:361
811110,0rcu_preempt19-21ksoftirqd/110:43:341
811010,0rcu_preempt20886-21ping07:28:401
81960,0rcu_preempt19-21ksoftirqd/110:34:081
81960,0rcu_preempt17605-21cyclictest07:23:491
81950,0rcu_preempt19-21ksoftirqd/111:03:461
10050820,0irq/346-4848400111rcuc/011:13:470
81780,0rcu_preempt19-21ksoftirqd/110:28:341
10050770,0irq/346-4848400111rcuc/010:48:450
10050730,0irq/346-484840028244-1kworker/0:1H11:19:070
81720,0rcu_preempt54-21kswapd011:48:350
10050720,0irq/346-484840024640-1kworker/0:2H09:45:490
10050720,0irq/346-484840021111-1kworker/0:3H10:14:100
10050700,0irq/346-48484007017-1kworker/0:0H09:57:210
10050700,0irq/346-484840032573-1kworker/0:2H12:10:550
10050700,0irq/346-484840012821-1kworker/0:0H11:44:550
81690,0rcu_preempt54-21kswapd012:10:321
81690,0rcu_preempt26040-1kworker/1:0H10:25:511
81690,0rcu_preempt17451-1kworker/1:1H12:34:371
10050690,0irq/346-484840024640-1kworker/0:2H09:41:420
10050690,0irq/346-484840013956-1kworker/0:1H10:31:140
1760699682,0cyclictest7654-21munin-node0
81670,0rcu_preempt19167-21munin-node1
17606996710,0cyclictest643-21sh10:54:480
10050670,0irq/346-484840027272-1kworker/0:2H11:24:080
10050670,0irq/346-484840026041-1kworker/0:0H10:20:290
17606996517,0cyclictest0-21swapper/010:26:410
1760699634,0cyclictest0-21swapper/010:04:540
81620,0rcu_preempt19-21ksoftirqd/112:03:471
81620,0rcu_preempt19-21ksoftirqd/110:48:341
81620,0rcu_preempt19-21ksoftirqd/110:40:521
17606996215,0cyclictest0-21swapper/009:51:540
17606996215,0cyclictest0-21swapper/009:51:540
81610,0rcu_preempt19-21ksoftirqd/109:29:181
1760699617,0cyclictest25064-21ssh12:25:240
1760699615,0cyclictest18461-21runrttasks10:40:020
1760699612,0cyclictest6323-21taskset09:22:340
1760699612,0cyclictest0-21swapper/012:13:420
17606996115,0cyclictest0-21swapper/009:08:460
1760699603,0cyclictest0-21swapper/011:53:460
1760699602,0cyclictest6719-21ssh11:33:510
1760699602,0cyclictest6719-21ssh11:33:510
1760699602,0cyclictest20886-21ping07:33:330
1760699602,0cyclictest20886-21ping07:33:330
1760699592,0cyclictest17378-21munin-node0
1760699592,0cyclictest0-21swapper/010:48:230
1760699591,0cyclictest12184-21runrttasks11:06:590
1760699582,0cyclictest0-21swapper/007:38:460
17606995814,0cyclictest0-21swapper/008:41:540
1760699575,0cyclictest54-21kswapd010:36:010
1760699571,0cyclictest1409-21ping07:58:230
1760699563,0cyclictest0-21swapper/010:09:140
1760699562,0cyclictest20886-21ping07:18:350
1760699562,0cyclictest0-21swapper/012:29:310
1760699562,0cyclictest0-21swapper/012:23:230
1760699562,0cyclictest0-21swapper/011:42:480
17606995613,0cyclictest2965-21runrttasks12:36:000
17606995613,0cyclictest0-21swapper/011:59:520
17606995610,0cyclictest22528-1kworker/0:2H07:23:560
1760699552,0cyclictest9670-21awk09:58:410
1760699552,0cyclictest0-21swapper/011:28:410
1760699552,0cyclictest0-21swapper/007:08:480
17606995512,0cyclictest0-21swapper/009:14:320
9950540,0irq/345-48484009431-21192.168.115.60-08:19:301
81540,0rcu_preempt3-21ksoftirqd/011:08:380
81540,0rcu_preempt19-21ksoftirqd/110:53:421
1760699543,0cyclictest20886-21ping07:43:350
1760699542,0cyclictest12373-21df_abs09:28:380
17606995411,0cyclictest0-21swapper/008:03:470
81530,0rcu_preempt1409-21ping08:18:340
81530,0rcu_preempt0-21swapper/109:13:331
1760699537,0cyclictest3892-21dropbear10:58:390
1760699531,0cyclictest20886-21ping07:28:350
81520,0rcu_preempt851-21rngd12:25:391
81520,0rcu_preempt19-21ksoftirqd/112:28:501
1760699522,0cyclictest1350-21lldpd08:50:170
81510,0rcu_preempt3-21ksoftirqd/007:58:520
81510,0rcu_preempt3-21ksoftirqd/007:13:450
81510,0rcu_preempt19-21ksoftirqd/109:38:351
81500,0rcu_preempt3-21ksoftirqd/012:04:540
81500,0rcu_preempt3-21ksoftirqd/008:53:440
10050500,0irq/346-48484004371-21ssh09:53:341
10050500,0irq/346-48484002711-21ssh12:03:231
81480,0rcu_preempt3-21ksoftirqd/008:08:470
10050480,0irq/346-484840019-21ksoftirqd/110:02:251
9950470,0irq/345-48484009820-1kworker/1:0H09:28:021
9950470,0irq/345-484840024587-21diskmemload11:42:501
81470,0rcu_preempt29080-21nfs4_client11:23:461
81470,0rcu_preempt28596-21kworker/1:108:07:251
81460,0rcu_preempt3-21ksoftirqd/008:14:460
81460,0rcu_preempt19-21ksoftirqd/111:11:291
81460,0rcu_preempt0-21swapper/112:13:511
10050460,0irq/346-484840019-21ksoftirqd/108:08:411
81450,0rcu_preempt54-21kswapd008:28:471
81450,0rcu_preempt20886-21ping07:21:421
81450,0rcu_preempt19-21ksoftirqd/111:53:451
81450,0rcu_preempt19-21ksoftirqd/108:23:391
81450,0rcu_preempt19-21ksoftirqd/107:59:431
81450,0rcu_preempt19-21ksoftirqd/107:44:081
81450,0rcu_preempt19-21ksoftirqd/107:35:331
81450,0rcu_preempt19-21ksoftirqd/107:35:331
81450,0rcu_preempt17249-21ps08:43:480
81450,0rcu_preempt1409-21ping08:24:310
10050450,0irq/346-48484006961-1kworker/0:0H07:03:380
81440,0rcu_preempt3-21ksoftirqd/008:59:030
81440,0rcu_preempt3-21ksoftirqd/008:33:490
81440,0rcu_preempt19-21ksoftirqd/109:47:051
81430,0rcu_preempt3-21ksoftirqd/009:06:460
81430,0rcu_preempt3-21ksoftirqd/007:51:420
81430,0rcu_preempt20886-21ping07:39:401
81430,0rcu_preempt19-21ksoftirqd/111:47:131
81430,0rcu_preempt19-21ksoftirqd/111:13:441
81430,0rcu_preempt19-21ksoftirqd/110:03:511
81430,0rcu_preempt1409-21ping08:14:051
81420,0rcu_preempt54-21kswapd011:19:481
81420,0rcu_preempt3-21ksoftirqd/008:30:470
81420,0rcu_preempt28596-21kworker/1:109:18:531
81420,0rcu_preempt24587-21diskmemload11:33:361
81420,0rcu_preempt24587-21diskmemload11:33:361
81420,0rcu_preempt24587-21diskmemload10:58:381
81420,0rcu_preempt24587-21diskmemload09:33:521
81420,0rcu_preempt19-21ksoftirqd/112:18:361
81420,0rcu_preempt19-21ksoftirqd/108:48:421
81420,0rcu_preempt1542-21memory11:28:471
10050420,0irq/346-484840021420-21ssh11:48:491
81410,0rcu_preempt54-21kswapd008:33:471
81410,0rcu_preempt19-21ksoftirqd/110:18:131
81410,0rcu_preempt19-21ksoftirqd/108:53:501
81410,0rcu_preempt19-21ksoftirqd/107:57:101
81410,0rcu_preempt16754-21ntpdc07:03:431
308552410,0chrt28706-1kworker/1:2H07:48:251
81400,0rcu_preempt29982-21gzip10:18:501
81400,0rcu_preempt19-21ksoftirqd/108:58:391
81400,0rcu_preempt19-21ksoftirqd/108:43:491
81400,0rcu_preempt19-21ksoftirqd/107:13:421
81390,0rcu_preempt19-21ksoftirqd/107:08:431
81380,0rcu_preempt19-21ksoftirqd/109:03:331
81360,0rcu_preempt19-21ksoftirqd/108:38:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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