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2026-08-29 - 19:30

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Sat Aug 29, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811450,0rcu_preempt3-21ksoftirqd/009:39:560
811410,0rcu_preempt3-21ksoftirqd/011:58:180
811380,0rcu_preempt3-21ksoftirqd/010:25:470
811360,0rcu_preempt3-21ksoftirqd/009:29:510
811360,0rcu_preempt3-21ksoftirqd/009:20:520
811350,0rcu_preempt3-21ksoftirqd/010:43:060
811350,0rcu_preempt3-21ksoftirqd/010:18:170
811330,0rcu_preempt54-21kswapd010:52:270
811330,0rcu_preempt3-21ksoftirqd/012:07:420
811320,0rcu_preempt3-21ksoftirqd/011:33:090
811320,0rcu_preempt3-21ksoftirqd/010:37:560
811320,0rcu_preempt3-21ksoftirqd/010:23:060
811300,0rcu_preempt3-21ksoftirqd/012:33:150
811300,0rcu_preempt3-21ksoftirqd/011:42:390
811300,0rcu_preempt3-21ksoftirqd/010:59:150
811300,0rcu_preempt3-21ksoftirqd/010:13:590
811300,0rcu_preempt3-21ksoftirqd/009:56:070
811290,0rcu_preempt3-21ksoftirqd/012:23:060
811290,0rcu_preempt3-21ksoftirqd/009:19:010
811280,0rcu_preempt3-21ksoftirqd/012:25:060
811280,0rcu_preempt3-21ksoftirqd/012:03:040
811280,0rcu_preempt3-21ksoftirqd/009:45:350
811260,0rcu_preempt3-21ksoftirqd/012:12:590
811250,0rcu_preempt3-21ksoftirqd/012:36:380
811240,0rcu_preempt3-21ksoftirqd/010:04:040
811220,0rcu_preempt3-21ksoftirqd/009:26:110
811110,0rcu_preempt3-21ksoftirqd/011:34:580
811100,0rcu_preempt3-21ksoftirqd/011:52:030
811020,0rcu_preempt19-21ksoftirqd/107:19:341
811010,0rcu_preempt3-21ksoftirqd/011:49:050
811010,0rcu_preempt3-21ksoftirqd/011:00:130
811010,0rcu_preempt3-21ksoftirqd/010:05:000
811000,0rcu_preempt3-21ksoftirqd/011:09:040
81990,0rcu_preempt3-21ksoftirqd/010:45:110
81990,0rcu_preempt3-21ksoftirqd/009:35:230
81980,0rcu_preempt3-21ksoftirqd/012:18:440
81970,0rcu_preempt3-21ksoftirqd/011:15:330
81970,0rcu_preempt3-21ksoftirqd/011:15:330
81960,0rcu_preempt3-21ksoftirqd/009:12:430
81920,0rcu_preempt3-21ksoftirqd/011:23:200
81890,0rcu_preempt26099-21ping07:44:520
81850,0rcu_preempt3-21ksoftirqd/008:19:500
81800,0rcu_preempt3-21ksoftirqd/009:04:320
81790,0rcu_preempt3-21ksoftirqd/009:52:260
81780,0rcu_preempt3-21ksoftirqd/008:53:560
81780,0rcu_preempt3-21ksoftirqd/008:16:250
81770,0rcu_preempt3-21ksoftirqd/011:24:580
81770,0rcu_preempt3-21ksoftirqd/011:24:580
81770,0rcu_preempt3-21ksoftirqd/011:11:320
81770,0rcu_preempt3-21ksoftirqd/011:11:320
81770,0rcu_preempt3-21ksoftirqd/009:02:200
81760,0rcu_preempt3-21ksoftirqd/008:10:510
81750,0rcu_preempt3-21ksoftirqd/010:33:470
81750,0rcu_preempt3-21ksoftirqd/008:30:000
81750,0rcu_preempt3-21ksoftirqd/008:04:450
81750,0rcu_preempt3-21ksoftirqd/007:54:540
81750,0rcu_preempt3-21ksoftirqd/007:16:500
81750,0rcu_preempt3-21ksoftirqd/007:16:500
81750,0rcu_preempt16637-21kworker/0:208:54:480
81740,0rcu_preempt3-21ksoftirqd/008:44:180
81740,0rcu_preempt3-21ksoftirqd/008:39:200
81740,0rcu_preempt3-21ksoftirqd/007:50:120
81730,0rcu_preempt6489-21ping07:59:500
81730,0rcu_preempt3-21ksoftirqd/008:46:260
81730,0rcu_preempt3-21ksoftirqd/008:28:340
81730,0rcu_preempt3-21ksoftirqd/007:14:200
10050700,0irq/346-4848400181ktimersoftd/109:47:301
10050690,0irq/346-4848400181ktimersoftd/109:30:421
10050690,0irq/346-4848400171rcuc/110:39:321
81680,0rcu_preempt3-21ksoftirqd/007:39:350
81670,0rcu_preempt3-21ksoftirqd/007:37:570
9950650,0irq/345-4848400181ktimersoftd/112:25:311
10050640,0irq/346-4848400171rcuc/111:43:431
10050630,0irq/346-4848400181ktimersoftd/110:25:421
10050630,0irq/346-4848400171rcuc/111:48:381
81620,0rcu_preempt3-21ksoftirqd/007:19:460
81620,0rcu_preempt26099-21ping07:30:080
10050620,0irq/346-4848400181ktimersoftd/112:02:311
10050620,0irq/346-4848400181ktimersoftd/108:14:331
10050620,0irq/346-4848400171rcuc/112:15:221
81610,0rcu_preempt26092-21kworker/0:207:28:350
10050610,0irq/346-4848400171rcuc/110:40:381
9950600,0irq/345-4848400171rcuc/109:19:531
10050600,0irq/346-484840029675-1kworker/1:1H11:53:501
10050600,0irq/346-4848400171rcuc/112:08:161
10050600,0irq/346-4848400171rcuc/109:28:261
10050590,0irq/346-4848400181ktimersoftd/112:35:331
10050590,0irq/346-4848400171rcuc/110:10:241
10050590,0irq/346-4848400171rcuc/110:03:091
10050580,0irq/346-4848400181ktimersoftd/110:32:131
10050580,0irq/346-4848400171rcuc/110:20:511
10050570,0irq/346-4848400181ktimersoftd/109:13:551
10050570,0irq/346-4848400171rcuc/112:20:341
9950560,0irq/345-4848400171rcuc/110:51:531
10050560,0irq/346-484840019721-1kworker/1:0H11:58:591
10050560,0irq/346-4848400181ktimersoftd/111:30:271
10050560,0irq/346-4848400181ktimersoftd/111:06:211
10050560,0irq/346-4848400171rcuc/112:30:301
10050560,0irq/346-4848400171rcuc/110:49:271
9950540,0irq/345-4848400181ktimersoftd/109:59:301
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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