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2026-05-26 - 15:07

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 Tue May 26, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81780,0rcu_preempt3-21ksoftirqd/012:11:250
81740,0rcu_preempt19-21ksoftirqd/110:57:121
81720,0rcu_preempt19-21ksoftirqd/112:04:011
81710,0rcu_preempt3-21ksoftirqd/010:13:550
81710,0rcu_preempt19-21ksoftirqd/111:03:121
81710,0rcu_preempt19-21ksoftirqd/109:43:511
81700,0rcu_preempt1937-21munin-run09:42:511
81690,0rcu_preempt19-21ksoftirqd/112:02:501
81670,0rcu_preempt4980-21rm11:23:560
81670,0rcu_preempt3-21ksoftirqd/012:01:220
81650,0rcu_preempt18839-21kworker/0:111:40:260
81640,0rcu_preempt3-21ksoftirqd/012:03:170
81630,0rcu_preempt851-21rngd09:44:130
81620,0rcu_preempt19-21ksoftirqd/111:30:181
81620,0rcu_preempt19-21ksoftirqd/109:23:081
81620,0rcu_preempt19-21ksoftirqd/109:23:081
81610,0rcu_preempt19-21ksoftirqd/112:37:301
81610,0rcu_preempt19-21ksoftirqd/111:18:021
81610,0rcu_preempt18718-21kworker/0:007:13:050
81600,0rcu_preempt19-21ksoftirqd/110:51:551
81590,0rcu_preempt19-21ksoftirqd/111:33:041
81590,0rcu_preempt19-21ksoftirqd/107:43:171
81590,0rcu_preempt19-21ksoftirqd/107:28:131
10050590,0irq/346-48484000-21swapper/009:16:150
10050590,0irq/346-48484000-21swapper/009:16:150
81580,0rcu_preempt3-21ksoftirqd/008:23:100
81570,0rcu_preempt3-21ksoftirqd/011:08:190
81570,0rcu_preempt3-21ksoftirqd/011:08:190
81570,0rcu_preempt3-21ksoftirqd/010:58:040
81570,0rcu_preempt3-21ksoftirqd/009:48:020
81570,0rcu_preempt3-21ksoftirqd/008:28:010
81570,0rcu_preempt19-21ksoftirqd/110:24:101
81570,0rcu_preempt19-21ksoftirqd/110:18:211
10050570,0irq/346-484840054-21kswapd012:13:120
81560,0rcu_preempt3-21ksoftirqd/009:58:170
81560,0rcu_preempt3-21ksoftirqd/009:58:170
81560,0rcu_preempt19768-21ssh11:39:011
81560,0rcu_preempt19-21ksoftirqd/112:08:031
81560,0rcu_preempt19-21ksoftirqd/107:58:151
10050560,0irq/346-48484000-21swapper/011:03:370
81550,0rcu_preempt3-21ksoftirqd/011:53:180
81550,0rcu_preempt3-21ksoftirqd/010:03:110
81550,0rcu_preempt3-21ksoftirqd/009:55:110
81550,0rcu_preempt3-21ksoftirqd/009:33:100
81550,0rcu_preempt3-21ksoftirqd/009:08:150
81550,0rcu_preempt19685-21ntp_states10:33:160
10050550,0irq/346-484840026812-1kworker/0:1H09:38:150
81540,0rcu_preempt3-21ksoftirqd/011:33:160
81540,0rcu_preempt22863-21apt-get11:43:010
81540,0rcu_preempt20260-21php-cgi09:28:090
81540,0rcu_preempt19-21ksoftirqd/111:02:121
9950530,0irq/345-4848400181ktimersoftd/111:24:331
81530,0rcu_preempt9171-21ping08:13:000
81530,0rcu_preempt3-21ksoftirqd/012:28:150
81530,0rcu_preempt3-21ksoftirqd/011:30:140
81530,0rcu_preempt3-21ksoftirqd/010:22:520
81530,0rcu_preempt3-21ksoftirqd/009:18:010
81530,0rcu_preempt3-21ksoftirqd/008:08:250
81530,0rcu_preempt19-21ksoftirqd/109:13:471
81530,0rcu_preempt19-21ksoftirqd/109:13:471
81520,0rcu_preempt3-21ksoftirqd/012:25:270
81520,0rcu_preempt3-21ksoftirqd/012:25:270
81520,0rcu_preempt3-21ksoftirqd/011:18:160
81520,0rcu_preempt3-21ksoftirqd/010:53:060
81520,0rcu_preempt3-21ksoftirqd/010:50:200
81520,0rcu_preempt3-21ksoftirqd/007:52:270
10050520,0irq/346-484840019-21ksoftirqd/112:23:491
10050520,0irq/346-484840019-21ksoftirqd/112:23:491
81510,0rcu_preempt3-21ksoftirqd/011:13:170
81510,0rcu_preempt3-21ksoftirqd/010:08:170
81510,0rcu_preempt3-21ksoftirqd/008:58:090
81510,0rcu_preempt3-21ksoftirqd/008:57:180
81510,0rcu_preempt19-21ksoftirqd/108:33:031
81510,0rcu_preempt13355-21kworker/u4:011:51:190
81510,0rcu_preempt10985-21kworker/0:208:03:050
81510,0rcu_preempt10985-21kworker/0:208:03:050
81500,0rcu_preempt7912-21apt-get07:53:010
81500,0rcu_preempt3-21ksoftirqd/012:33:120
81500,0rcu_preempt3-21ksoftirqd/010:43:100
81500,0rcu_preempt3-21ksoftirqd/010:20:230
81500,0rcu_preempt3-21ksoftirqd/008:01:190
81500,0rcu_preempt24610-21ntp_states10:38:160
81500,0rcu_preempt0-21swapper/110:10:171
26822500,0chrt10050irq/346-484840007:36:190
81490,0rcu_preempt3-21ksoftirqd/012:18:110
81490,0rcu_preempt3-21ksoftirqd/009:03:110
81490,0rcu_preempt3-21ksoftirqd/009:03:110
81490,0rcu_preempt3-21ksoftirqd/007:25:560
81490,0rcu_preempt19-21ksoftirqd/110:43:021
81490,0rcu_preempt11646-21kworker/1:212:17:521
10050490,0irq/346-48484000-21swapper/010:28:450
81480,0rcu_preempt3-21ksoftirqd/007:03:080
81470,0rcu_preempt3-21ksoftirqd/009:23:560
81470,0rcu_preempt3-21ksoftirqd/009:23:560
81470,0rcu_preempt3-21ksoftirqd/008:33:160
81470,0rcu_preempt3-21ksoftirqd/008:21:180
81470,0rcu_preempt24616-21php-cgi08:43:070
81470,0rcu_preempt19-21ksoftirqd/109:18:181
81470,0rcu_preempt19-21ksoftirqd/108:06:171
81470,0rcu_preempt19-21ksoftirqd/108:06:171
10050470,0irq/346-48484003034-21aten_rapower_cu07:38:030
81460,0rcu_preempt3-21ksoftirqd/008:49:450
81460,0rcu_preempt3-21ksoftirqd/008:38:160
81460,0rcu_preempt3-21ksoftirqd/007:08:060
81460,0rcu_preempt19-21ksoftirqd/111:50:561
81460,0rcu_preempt19-21ksoftirqd/110:03:081
81460,0rcu_preempt19-21ksoftirqd/108:13:191
81460,0rcu_preempt19-21ksoftirqd/108:08:131
10050460,0irq/346-48484004239-1kworker/1:0H09:48:571
81440,0rcu_preempt30063-1kworker/1:0H11:53:161
81440,0rcu_preempt28692-21ping07:28:010
81440,0rcu_preempt19-21ksoftirqd/110:33:121
81440,0rcu_preempt19-21ksoftirqd/107:38:161
81430,0rcu_preempt19-21ksoftirqd/111:45:551
81430,0rcu_preempt19-21ksoftirqd/109:58:121
81430,0rcu_preempt19-21ksoftirqd/109:58:121
81430,0rcu_preempt19-21ksoftirqd/107:33:161
10050430,0irq/346-48484003-21ksoftirqd/007:43:200
81420,0rcu_preempt2230-21apt-get12:28:011
81420,0rcu_preempt19-21ksoftirqd/110:13:001
81420,0rcu_preempt19-21ksoftirqd/109:53:511
81420,0rcu_preempt19-21ksoftirqd/108:18:131
81420,0rcu_preempt19-21ksoftirqd/107:57:221
81410,0rcu_preempt32420-21diskmemload10:40:391
81410,0rcu_preempt28692-21ping07:18:100
81410,0rcu_preempt19-21ksoftirqd/112:13:021
81410,0rcu_preempt19-21ksoftirqd/111:09:281
81410,0rcu_preempt19-21ksoftirqd/111:09:281
81410,0rcu_preempt19-21ksoftirqd/109:35:481
81410,0rcu_preempt19-21ksoftirqd/108:58:171
81410,0rcu_preempt19-21ksoftirqd/108:23:041
81410,0rcu_preempt19-21ksoftirqd/107:03:041
10050410,0irq/346-484840032075-1kworker/1:3H09:08:421
81400,0rcu_preempt19-21ksoftirqd/111:13:481
81400,0rcu_preempt19-21ksoftirqd/110:29:111
81400,0rcu_preempt19-21ksoftirqd/109:28:141
81400,0rcu_preempt19-21ksoftirqd/107:23:241
81400,0rcu_preempt19-21ksoftirqd/107:18:251
81380,0rcu_preempt19-21ksoftirqd/108:43:071
81370,0rcu_preempt19-21ksoftirqd/109:07:461
81370,0rcu_preempt19-21ksoftirqd/109:07:461
81370,0rcu_preempt19-21ksoftirqd/108:53:161
81370,0rcu_preempt19-21ksoftirqd/108:38:181
81370,0rcu_preempt19-21ksoftirqd/107:08:091
81350,0rcu_preempt19-21ksoftirqd/108:52:071
81350,0rcu_preempt19-21ksoftirqd/107:13:261
81340,0rcu_preempt19-21ksoftirqd/108:32:511
10050330,0irq/346-48484005852-1kworker/1:0H07:48:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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