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2026-05-02 - 15:08

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 Sat May 02, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811530,0rcu_preempt3-21ksoftirqd/007:18:300
811350,0rcu_preempt3-21ksoftirqd/011:38:380
811130,0rcu_preempt3-21ksoftirqd/007:35:250
811080,0rcu_preempt3-21ksoftirqd/010:08:380
811080,0rcu_preempt3-21ksoftirqd/010:08:380
811080,0rcu_preempt3-21ksoftirqd/007:43:170
81980,0rcu_preempt819-1kworker/1:0H08:08:271
81960,0rcu_preempt3-21ksoftirqd/009:33:410
81960,0rcu_preempt3-21ksoftirqd/009:20:510
81950,0rcu_preempt3-21ksoftirqd/009:13:420
81940,0rcu_preempt3-21ksoftirqd/009:48:270
81940,0rcu_preempt3-21ksoftirqd/009:03:400
81940,0rcu_preempt3-21ksoftirqd/008:23:440
81930,0rcu_preempt3-21ksoftirqd/011:43:400
81930,0rcu_preempt3-21ksoftirqd/010:16:550
81920,0rcu_preempt3-21ksoftirqd/009:08:370
81920,0rcu_preempt3-21ksoftirqd/009:08:370
81880,0rcu_preempt3-21ksoftirqd/010:18:390
81870,0rcu_preempt3-21ksoftirqd/012:18:390
81870,0rcu_preempt3-21ksoftirqd/012:13:350
81870,0rcu_preempt3-21ksoftirqd/011:28:400
81870,0rcu_preempt3-21ksoftirqd/009:31:490
81860,0rcu_preempt3-21ksoftirqd/007:08:340
81850,0rcu_preempt3-21ksoftirqd/007:53:410
81830,0rcu_preempt3-21ksoftirqd/011:18:420
81830,0rcu_preempt3-21ksoftirqd/008:08:310
81830,0rcu_preempt19-21ksoftirqd/112:22:261
81820,0rcu_preempt3-21ksoftirqd/008:48:410
81820,0rcu_preempt16856-21ping07:30:200
81800,0rcu_preempt3-21ksoftirqd/008:13:290
81790,0rcu_preempt9717-21kworker/0:210:38:400
81780,0rcu_preempt3-21ksoftirqd/012:33:320
81780,0rcu_preempt3-21ksoftirqd/009:38:410
81780,0rcu_preempt28415-21kworker/0:107:38:460
81780,0rcu_preempt28415-21kworker/0:107:38:460
81780,0rcu_preempt19-21ksoftirqd/107:38:131
81740,0rcu_preempt3-21ksoftirqd/011:48:400
81730,0rcu_preempt3-21ksoftirqd/011:26:270
81730,0rcu_preempt3-21ksoftirqd/010:02:340
81720,0rcu_preempt8268-21kworker/0:010:03:380
81710,0rcu_preempt3-21ksoftirqd/010:53:260
81710,0rcu_preempt3-21ksoftirqd/010:33:440
81700,0rcu_preempt3-21ksoftirqd/012:08:280
81700,0rcu_preempt3-21ksoftirqd/010:28:390
81690,0rcu_preempt3-21ksoftirqd/009:43:560
81690,0rcu_preempt0-21swapper/008:38:150
81680,0rcu_preempt3-21ksoftirqd/012:31:360
81680,0rcu_preempt3-21ksoftirqd/012:31:360
81680,0rcu_preempt3-21ksoftirqd/012:26:240
81680,0rcu_preempt3-21ksoftirqd/011:08:330
81670,0rcu_preempt3-21ksoftirqd/011:58:340
81670,0rcu_preempt3-21ksoftirqd/009:53:290
81670,0rcu_preempt3-21ksoftirqd/008:28:300
81670,0rcu_preempt3-21ksoftirqd/007:58:300
81660,0rcu_preempt3-21ksoftirqd/011:17:450
81660,0rcu_preempt3-21ksoftirqd/008:53:330
81660,0rcu_preempt3-21ksoftirqd/007:13:370
81650,0rcu_preempt3-21ksoftirqd/012:05:210
81650,0rcu_preempt0-21swapper/110:38:511
81640,0rcu_preempt3-21ksoftirqd/011:36:430
81630,0rcu_preempt3-21ksoftirqd/008:58:350
81630,0rcu_preempt19-21ksoftirqd/110:08:381
81630,0rcu_preempt19-21ksoftirqd/110:08:381
81620,0rcu_preempt726-21kworker/0:009:25:220
81620,0rcu_preempt3-21ksoftirqd/011:03:340
81620,0rcu_preempt3-21ksoftirqd/008:03:330
81610,0rcu_preempt3-21ksoftirqd/010:44:140
81610,0rcu_preempt19-21ksoftirqd/110:47:271
81610,0rcu_preempt19-21ksoftirqd/109:16:071
81600,0rcu_preempt3-21ksoftirqd/011:53:260
81590,0rcu_preempt20567-21diskmemload09:33:311
81580,0rcu_preempt19-21ksoftirqd/108:13:281
81570,0rcu_preempt3-21ksoftirqd/010:51:090
81570,0rcu_preempt3-21ksoftirqd/010:51:090
81570,0rcu_preempt3-21ksoftirqd/010:24:130
81570,0rcu_preempt19-21ksoftirqd/112:28:391
81570,0rcu_preempt19-21ksoftirqd/112:28:391
81560,0rcu_preempt19-21ksoftirqd/111:03:321
81560,0rcu_preempt19-21ksoftirqd/108:23:251
81550,0rcu_preempt3-21ksoftirqd/008:43:260
81550,0rcu_preempt3-21ksoftirqd/008:18:150
81550,0rcu_preempt19-21ksoftirqd/109:22:131
81550,0rcu_preempt16856-21ping07:26:290
81540,0rcu_preempt3-21ksoftirqd/010:58:270
81540,0rcu_preempt19-21ksoftirqd/112:24:231
81530,0rcu_preempt19-21ksoftirqd/111:53:351
81530,0rcu_preempt19-21ksoftirqd/111:39:331
81530,0rcu_preempt19-21ksoftirqd/111:09:191
81530,0rcu_preempt19-21ksoftirqd/110:22:571
81530,0rcu_preempt19-21ksoftirqd/109:45:441
81520,0rcu_preempt19-21ksoftirqd/112:10:491
81520,0rcu_preempt19-21ksoftirqd/110:37:031
81520,0rcu_preempt19-21ksoftirqd/109:58:261
81510,0rcu_preempt27033-21df_abs07:48:280
81510,0rcu_preempt0-21swapper/111:33:411
81490,0rcu_preempt3-21ksoftirqd/008:33:310
81490,0rcu_preempt19-21ksoftirqd/111:46:111
81480,0rcu_preempt19-21ksoftirqd/110:50:251
81480,0rcu_preempt19-21ksoftirqd/110:50:251
81470,0rcu_preempt19-21ksoftirqd/109:53:311
81460,0rcu_preempt19-21ksoftirqd/109:08:251
81460,0rcu_preempt19-21ksoftirqd/109:08:251
81450,0rcu_preempt19-21ksoftirqd/111:48:241
81450,0rcu_preempt19-21ksoftirqd/109:38:371
81450,0rcu_preempt19-21ksoftirqd/108:23:131
81440,0rcu_preempt54-21kswapd010:30:261
81440,0rcu_preempt19-21ksoftirqd/111:28:251
81440,0rcu_preempt19-21ksoftirqd/107:58:261
81430,0rcu_preempt19-21ksoftirqd/111:13:411
81430,0rcu_preempt19-21ksoftirqd/107:08:051
81420,0rcu_preempt19-21ksoftirqd/111:18:401
81410,0rcu_preempt9373-21grep09:28:441
81410,0rcu_preempt851-21rngd11:26:501
81410,0rcu_preempt2147-21kworker/1:112:13:391
81410,0rcu_preempt19-21ksoftirqd/112:03:481
81410,0rcu_preempt19-21ksoftirqd/111:58:381
81410,0rcu_preempt19-21ksoftirqd/108:03:351
13569994124,0cyclictest20567-21diskmemload10:53:241
81400,0rcu_preempt2147-21kworker/1:110:17:261
81400,0rcu_preempt19-21ksoftirqd/110:25:511
81400,0rcu_preempt19-21ksoftirqd/107:53:301
81400,0rcu_preempt19-21ksoftirqd/107:16:451
81390,0rcu_preempt54-21kswapd009:03:091
81390,0rcu_preempt3-21ksoftirqd/007:03:270
81390,0rcu_preempt19-21ksoftirqd/111:00:101
81390,0rcu_preempt19-21ksoftirqd/110:07:111
81390,0rcu_preempt19-21ksoftirqd/109:49:251
81390,0rcu_preempt19-21ksoftirqd/109:03:281
81390,0rcu_preempt19-21ksoftirqd/108:56:281
81380,0rcu_preempt19-21ksoftirqd/112:34:161
81380,0rcu_preempt19-21ksoftirqd/109:23:511
81380,0rcu_preempt19-21ksoftirqd/108:48:361
81380,0rcu_preempt19-21ksoftirqd/108:35:371
81380,0rcu_preempt19-21ksoftirqd/107:38:381
81380,0rcu_preempt19-21ksoftirqd/107:38:381
81380,0rcu_preempt16856-21ping07:18:411
13569993825,0cyclictest1316-21sshd08:38:291
13569993824,0cyclictest12502-21apt-get08:43:251
13569993820,0cyclictest0-21swapper/108:28:261
81370,0rcu_preempt19-21ksoftirqd/107:48:461
81370,0rcu_preempt19-21ksoftirqd/107:08:501
13569993622,0cyclictest25211-21apt-get07:43:261
81350,0rcu_preempt19-21ksoftirqd/107:28:151
13569993115,0cyclictest18597-21latency_hist07:23:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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