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2026-05-21 - 00:37

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 Wed May 20, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811330,0rcu_preempt3-21ksoftirqd/009:10:310
811320,0rcu_preempt3-21ksoftirqd/010:46:470
811320,0rcu_preempt3-21ksoftirqd/009:52:500
811320,0rcu_preempt3-21ksoftirqd/009:52:500
811300,0rcu_preempt3-21ksoftirqd/012:10:310
811290,0rcu_preempt3-21ksoftirqd/010:21:010
811280,0rcu_preempt3-21ksoftirqd/010:34:440
811040,0rcu_preempt3-21ksoftirqd/010:31:030
811010,0rcu_preempt3-21ksoftirqd/010:48:270
81920,0rcu_preempt3-21ksoftirqd/010:38:130
81920,0rcu_preempt12351-21ping08:10:390
81880,0rcu_preempt3-21ksoftirqd/010:03:160
81870,0rcu_preempt3-21ksoftirqd/009:58:180
81870,0rcu_preempt3-21ksoftirqd/007:53:210
81860,0rcu_preempt3-21ksoftirqd/009:38:250
10050860,0irq/346-484840054-21kswapd011:28:090
81850,0rcu_preempt3-21ksoftirqd/009:44:110
81840,0rcu_preempt3-21ksoftirqd/012:04:010
81840,0rcu_preempt3-21ksoftirqd/011:17:510
81840,0rcu_preempt3-21ksoftirqd/008:23:490
81830,0rcu_preempt3-21ksoftirqd/008:01:560
81830,0rcu_preempt20475-21kworker/0:012:14:370
81820,0rcu_preempt3-21ksoftirqd/008:06:240
81810,0rcu_preempt54-21kswapd009:36:460
81810,0rcu_preempt3-21ksoftirqd/012:26:530
81810,0rcu_preempt3-21ksoftirqd/011:48:100
81810,0rcu_preempt3-21ksoftirqd/008:37:570
81810,0rcu_preempt13688-21kworker/0:111:00:380
81800,0rcu_preempt3-21ksoftirqd/009:01:060
81790,0rcu_preempt3929-21kworker/0:011:27:350
81790,0rcu_preempt3-21ksoftirqd/012:31:460
81790,0rcu_preempt3-21ksoftirqd/011:03:190
81790,0rcu_preempt3-21ksoftirqd/010:10:240
10050790,0irq/346-484840054-21kswapd011:08:160
81780,0rcu_preempt3-21ksoftirqd/011:36:190
81780,0rcu_preempt3-21ksoftirqd/008:54:150
81780,0rcu_preempt3-21ksoftirqd/008:13:260
81780,0rcu_preempt3-21ksoftirqd/007:12:300
81780,0rcu_preempt16977-21kworker/0:210:23:010
81770,0rcu_preempt3-21ksoftirqd/008:36:320
81760,0rcu_preempt3-21ksoftirqd/012:20:390
81760,0rcu_preempt3-21ksoftirqd/011:58:180
81760,0rcu_preempt3-21ksoftirqd/010:13:360
81760,0rcu_preempt3-21ksoftirqd/009:16:040
81760,0rcu_preempt3-21ksoftirqd/008:20:050
81760,0rcu_preempt3-21ksoftirqd/007:49:110
81750,0rcu_preempt3-21ksoftirqd/009:53:560
81750,0rcu_preempt3-21ksoftirqd/009:23:160
81750,0rcu_preempt16180-21kworker/0:010:53:570
81740,0rcu_preempt3-21ksoftirqd/011:53:140
81740,0rcu_preempt3-21ksoftirqd/011:38:270
81740,0rcu_preempt3-21ksoftirqd/011:38:270
81740,0rcu_preempt3-21ksoftirqd/009:32:180
81740,0rcu_preempt3-21ksoftirqd/009:21:410
81740,0rcu_preempt3-21ksoftirqd/008:50:240
81730,0rcu_preempt3-21ksoftirqd/012:35:230
81730,0rcu_preempt3-21ksoftirqd/009:05:520
81730,0rcu_preempt3-21ksoftirqd/008:43:170
81730,0rcu_preempt3-21ksoftirqd/007:47:030
81730,0rcu_preempt3-21ksoftirqd/007:33:140
81730,0rcu_preempt3-21ksoftirqd/007:15:160
81720,0rcu_preempt3-21ksoftirqd/011:45:150
81720,0rcu_preempt3-21ksoftirqd/011:18:210
81720,0rcu_preempt3-21ksoftirqd/008:32:350
10050690,0irq/346-4848400181ktimersoftd/109:36:361
81670,0rcu_preempt3-21ksoftirqd/007:22:570
81650,0rcu_preempt3-21ksoftirqd/007:28:280
81650,0rcu_preempt3-21ksoftirqd/007:28:280
9950640,0irq/345-4848400181ktimersoftd/110:35:421
10050640,0irq/346-484840022886-1kworker/1:0H11:42:361
10050640,0irq/346-484840022886-1kworker/1:0H11:42:361
81630,0rcu_preempt3-21ksoftirqd/007:27:560
10050630,0irq/346-4848400181ktimersoftd/111:36:181
9950600,0irq/345-484840019-21ksoftirqd/111:46:091
9950590,0irq/345-4848400181ktimersoftd/112:34:451
9950590,0irq/345-4848400171rcuc/110:46:401
9950580,0irq/345-4848400171rcuc/110:53:211
9950580,0irq/345-4848400171rcuc/109:51:011
9950580,0irq/345-4848400171rcuc/109:51:011
10050580,0irq/346-48484006431-21ssh09:10:481
10050580,0irq/346-4848400181ktimersoftd/112:27:051
81570,0rcu_preempt2865-21kworker/0:207:39:510
10050570,0irq/346-4848400171rcuc/111:49:541
10050560,0irq/346-4848400171rcuc/110:07:151
10050560,0irq/346-48484000-21swapper/110:31:391
9950550,0irq/345-4848400181ktimersoftd/112:22:091
9950550,0irq/345-4848400181ktimersoftd/111:31:021
9950550,0irq/345-4848400181ktimersoftd/109:47:231
9950550,0irq/345-4848400181ktimersoftd/109:21:041
81550,0rcu_preempt19-21ksoftirqd/110:01:151
10050550,0irq/346-48484002855699cyclictest10:48:051
10050550,0irq/346-484840019-21ksoftirqd/108:50:211
9950540,0irq/345-4848400181ktimersoftd/112:00:241
9950540,0irq/345-4848400181ktimersoftd/109:54:441
10050540,0irq/346-4848400171rcuc/111:02:021
9950530,0irq/345-4848400181ktimersoftd/112:17:171
9950530,0irq/345-4848400181ktimersoftd/112:10:221
9950530,0irq/345-4848400181ktimersoftd/110:38:531
9950530,0irq/345-4848400181ktimersoftd/109:27:221
9950530,0irq/345-4848400171rcuc/109:17:391
9950520,0irq/345-484840081rcu_preempt10:16:411
9950520,0irq/345-4848400171rcuc/111:57:061
9950520,0irq/345-4848400171rcuc/111:07:011
9950520,0irq/345-4848400171rcuc/110:08:181
10050490,0irq/346-48484006399-21ssh12:29:421
10050490,0irq/346-48484004434-1kworker/1:3H10:19:071
9950480,0irq/345-4848400171rcuc/111:09:431
81480,0rcu_preempt3-21ksoftirqd/007:03:160
81480,0rcu_preempt27051-21apt-get07:03:071
10050480,0irq/346-48484000-21swapper/109:38:211
10050470,0irq/346-48484000-21swapper/112:05:371
10050450,0irq/346-48484000-21swapper/111:21:041
10050440,0irq/346-48484007606-21ssh11:23:441
10050440,0irq/346-484840031833-21ping07:33:291
9950420,0irq/345-48484000-21swapper/107:17:561
10050410,0irq/346-48484009356-1kworker/1:0H10:23:191
10050410,0irq/346-484840020151-1kworker/1:1H09:29:181
9950390,0irq/345-48484000-21swapper/107:58:151
81360,0rcu_preempt23772-1kworker/1:2H08:32:561
10050360,0irq/346-48484008992-1kworker/1:3H07:48:141
9950350,0irq/345-484840054-21kswapd008:08:221
9950350,0irq/345-484840054-21kswapd008:05:141
10050350,0irq/346-48484000-21swapper/111:14:491
10050340,0irq/346-484840025956-21wget08:38:101
10050340,0irq/346-48484000-21swapper/108:58:111
81330,0rcu_preempt31833-21ping07:22:561
81330,0rcu_preempt19-21ksoftirqd/107:43:321
2855699323,0cyclictest0-21swapper/108:37:491
10050320,0irq/346-48484000-21swapper/108:45:541
10050310,0irq/346-48484000-21swapper/107:23:251
81300,0rcu_preempt0-21swapper/108:24:521
10050300,0irq/346-48484000-21swapper/109:05:061
81290,0rcu_preempt19-21ksoftirqd/107:28:191
81290,0rcu_preempt19-21ksoftirqd/107:28:191
9950280,0irq/345-484840029650-21grep07:08:261
81280,0rcu_preempt54-21kswapd007:38:141
10050280,0irq/346-48484000-21swapper/108:17:171
10050280,0irq/346-48484000-21swapper/107:53:151
10050270,0irq/346-48484000-21swapper/108:54:321
10050250,0irq/346-48484000-21swapper/108:18:161
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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