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2026-04-26 - 15:52

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 26, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811140,0rcu_preempt19-21ksoftirqd/112:12:381
81990,0rcu_preempt3-21ksoftirqd/012:19:280
81920,0rcu_preempt3-21ksoftirqd/011:59:480
81900,0rcu_preempt851-21rngd08:23:301
81880,0rcu_preempt19-21ksoftirqd/112:05:301
81880,0rcu_preempt19-21ksoftirqd/109:03:371
81870,0rcu_preempt19-21ksoftirqd/112:29:591
81860,0rcu_preempt54-21kswapd009:33:441
81860,0rcu_preempt19-21ksoftirqd/109:46:291
81840,0rcu_preempt19-21ksoftirqd/111:23:581
81820,0rcu_preempt19-21ksoftirqd/111:40:271
81820,0rcu_preempt19-21ksoftirqd/110:32:121
81810,0rcu_preempt19-21ksoftirqd/109:26:121
81760,0rcu_preempt54-21kswapd009:41:271
81760,0rcu_preempt54-21kswapd009:41:271
81760,0rcu_preempt19-21ksoftirqd/110:16:051
81760,0rcu_preempt0-21swapper/110:39:341
81740,0rcu_preempt3-21ksoftirqd/011:48:290
81740,0rcu_preempt19-21ksoftirqd/112:17:211
81740,0rcu_preempt15705-21kworker/1:209:29:511
81740,0rcu_preempt15705-21kworker/1:209:29:511
81740,0rcu_preempt0-21swapper/110:21:321
81740,0rcu_preempt0-21swapper/110:21:321
81720,0rcu_preempt0-21swapper/111:46:261
81700,0rcu_preempt19-21ksoftirqd/110:44:581
81690,0rcu_preempt19-21ksoftirqd/111:02:451
81690,0rcu_preempt19-21ksoftirqd/111:02:451
81690,0rcu_preempt19-21ksoftirqd/110:58:041
81690,0rcu_preempt19-21ksoftirqd/110:13:041
81680,0rcu_preempt19-21ksoftirqd/110:27:551
81680,0rcu_preempt19-21ksoftirqd/107:38:471
81670,0rcu_preempt19-21ksoftirqd/111:53:561
81660,0rcu_preempt19-21ksoftirqd/107:35:551
81650,0rcu_preempt19-21ksoftirqd/111:17:361
81650,0rcu_preempt19-21ksoftirqd/110:49:261
81650,0rcu_preempt19-21ksoftirqd/109:11:271
81650,0rcu_preempt0-21swapper/111:49:071
81630,0rcu_preempt3-21ksoftirqd/007:03:450
81630,0rcu_preempt19-21ksoftirqd/112:02:221
81630,0rcu_preempt19-21ksoftirqd/109:56:181
81630,0rcu_preempt19-21ksoftirqd/107:23:431
81620,0rcu_preempt19-21ksoftirqd/111:06:171
81610,0rcu_preempt19-21ksoftirqd/112:33:311
81610,0rcu_preempt19-21ksoftirqd/112:18:231
81610,0rcu_preempt19-21ksoftirqd/107:55:191
9950600,0irq/345-484840020668-1kworker/0:3H10:42:060
81600,0rcu_preempt19-21ksoftirqd/111:36:261
81600,0rcu_preempt19-21ksoftirqd/110:03:491
10050600,0irq/346-4848400851-21rngd11:44:560
10050600,0irq/346-4848400181ktimersoftd/110:35:201
10050600,0irq/346-4848400171rcuc/110:02:331
9950590,0irq/345-4848400171rcuc/111:10:241
81590,0rcu_preempt25689-1kworker/1:2H08:18:481
81590,0rcu_preempt19-21ksoftirqd/111:28:401
81590,0rcu_preempt19-21ksoftirqd/108:13:311
81580,0rcu_preempt19-21ksoftirqd/109:16:321
81570,0rcu_preempt19-21ksoftirqd/111:22:001
81560,0rcu_preempt3-21ksoftirqd/012:08:380
81560,0rcu_preempt32154-21kworker/0:107:48:310
81550,0rcu_preempt19-21ksoftirqd/108:03:461
9950530,0irq/345-4848400830-21ssh10:53:300
9950530,0irq/345-48484000-21swapper/008:38:190
81520,0rcu_preempt19-21ksoftirqd/108:08:491
81520,0rcu_preempt19-21ksoftirqd/107:58:301
81520,0rcu_preempt19-21ksoftirqd/107:13:431
10050520,0irq/346-4848400171rcuc/112:25:301
9950510,0irq/345-48484000-21swapper/009:08:360
81510,0rcu_preempt19-21ksoftirqd/109:48:371
1599510,0migration/07634-21runrttasks12:05:190
9950500,0irq/345-48484000-21swapper/010:20:460
9950500,0irq/345-48484000-21swapper/010:20:460
81500,0rcu_preempt3-21ksoftirqd/010:05:580
81500,0rcu_preempt19-21ksoftirqd/108:43:391
81500,0rcu_preempt19-21ksoftirqd/107:21:551
9950490,0irq/345-48484000-21swapper/011:41:290
81490,0rcu_preempt3-21ksoftirqd/012:30:410
81490,0rcu_preempt19-21ksoftirqd/109:18:461
81480,0rcu_preempt54-21kswapd008:41:150
81480,0rcu_preempt3-21ksoftirqd/010:58:300
81480,0rcu_preempt3-21ksoftirqd/010:58:300
81480,0rcu_preempt19-21ksoftirqd/107:08:201
10050480,0irq/346-484840011089-21ssh09:24:500
81470,0rcu_preempt891-21ntp_states07:48:441
81470,0rcu_preempt3-21ksoftirqd/011:11:490
81470,0rcu_preempt3-21ksoftirqd/010:00:240
81470,0rcu_preempt3-21ksoftirqd/008:46:270
10050470,0irq/346-48484000-21swapper/010:44:540
9950460,0irq/345-484840032512-21ssh11:58:200
81460,0rcu_preempt4757-21kworker/0:108:03:510
81460,0rcu_preempt3-21ksoftirqd/009:49:240
81460,0rcu_preempt3-21ksoftirqd/009:42:410
81460,0rcu_preempt3-21ksoftirqd/009:42:410
81460,0rcu_preempt3-21ksoftirqd/009:07:240
81460,0rcu_preempt3-21ksoftirqd/008:49:400
81460,0rcu_preempt21603-21apt-get08:53:301
81460,0rcu_preempt19-21ksoftirqd/108:38:321
10050460,0irq/346-48484006322-1kworker/0:3H08:08:450
10050460,0irq/346-48484000-21swapper/011:20:320
81450,0rcu_preempt54-21kswapd007:45:280
81450,0rcu_preempt3-21ksoftirqd/012:18:200
81450,0rcu_preempt3-21ksoftirqd/010:08:340
81450,0rcu_preempt3-21ksoftirqd/009:43:490
81450,0rcu_preempt3-21ksoftirqd/007:10:480
81450,0rcu_preempt25202-21kworker/0:011:23:200
81450,0rcu_preempt19-21ksoftirqd/108:48:441
81450,0rcu_preempt15705-21kworker/1:207:33:191
81440,0rcu_preempt3-21ksoftirqd/010:24:300
81440,0rcu_preempt3-21ksoftirqd/009:33:440
81440,0rcu_preempt3-21ksoftirqd/009:18:410
81440,0rcu_preempt3-21ksoftirqd/007:13:300
81440,0rcu_preempt23924-21ntp_states08:58:411
81440,0rcu_preempt19-21ksoftirqd/108:33:431
81440,0rcu_preempt0-21swapper/009:28:290
81440,0rcu_preempt0-21swapper/009:28:290
10050440,0irq/346-484840020668-1kworker/0:3H10:48:200
10050440,0irq/346-484840013050-1kworker/0:2H11:05:330
81430,0rcu_preempt7928-21kworker/0:210:30:180
81430,0rcu_preempt3-21ksoftirqd/012:38:010
81430,0rcu_preempt3-21ksoftirqd/012:26:160
81430,0rcu_preempt3-21ksoftirqd/009:13:380
81430,0rcu_preempt3-21ksoftirqd/009:03:160
81430,0rcu_preempt19-21ksoftirqd/107:43:231
13250430,0irq/301-480200013674-21df_abs10:33:340
81420,0rcu_preempt3-21ksoftirqd/011:36:250
81420,0rcu_preempt3-21ksoftirqd/009:57:430
1939099422,0cyclictest3034-21ping08:13:430
10050420,0irq/346-484840027522-21ssh10:14:030
81410,0rcu_preempt3-21ksoftirqd/011:17:230
81410,0rcu_preempt3-21ksoftirqd/008:29:100
81410,0rcu_preempt3-21ksoftirqd/008:25:500
81410,0rcu_preempt3-21ksoftirqd/007:58:310
81410,0rcu_preempt3-21ksoftirqd/007:54:140
81400,0rcu_preempt3-21ksoftirqd/011:29:460
81400,0rcu_preempt3-21ksoftirqd/008:55:220
81400,0rcu_preempt3-21ksoftirqd/008:18:490
81400,0rcu_preempt3-21ksoftirqd/007:23:460
81400,0rcu_preempt19-21ksoftirqd/107:07:321
1939199385,0cyclictest13574-21ssh08:28:341
1939099366,0cyclictest0-21swapper/007:37:580
1939099351,0cyclictest22671-21ping07:38:560
81330,0rcu_preempt3-21ksoftirqd/007:28:370
1939099331,0cyclictest22671-21ping07:18:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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