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2026-03-19 - 20:10

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 Thu Mar 19, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811340,0rcu_preempt3-21ksoftirqd/011:32:570
81920,0rcu_preempt19-21ksoftirqd/111:34:181
81900,0rcu_preempt9950irq/345-484840010:37:161
81900,0rcu_preempt9950irq/345-484840010:37:161
81750,0rcu_preempt54-21kswapd010:18:371
81680,0rcu_preempt19-21ksoftirqd/107:28:251
10050660,0irq/346-484840022328-1kworker/0:3H11:47:010
10050610,0irq/346-484840054-21kswapd011:24:171
10050610,0irq/346-484840013027-1kworker/1:2H10:32:151
81600,0rcu_preempt19-21ksoftirqd/112:38:561
81600,0rcu_preempt19-21ksoftirqd/109:34:181
81580,0rcu_preempt3-21ksoftirqd/011:19:060
81580,0rcu_preempt3-21ksoftirqd/010:24:120
10050580,0irq/346-484840032193-1kworker/0:1H11:59:070
10050580,0irq/346-484840032193-1kworker/0:1H11:59:070
81570,0rcu_preempt3-21ksoftirqd/009:44:230
81570,0rcu_preempt3-21ksoftirqd/008:08:570
81570,0rcu_preempt19-21ksoftirqd/109:29:061
81560,0rcu_preempt3-21ksoftirqd/008:39:120
81560,0rcu_preempt3-21ksoftirqd/008:34:070
81560,0rcu_preempt3-21ksoftirqd/008:19:230
10050560,0irq/346-484840054-21kswapd010:56:191
10050560,0irq/346-484840054-21kswapd010:56:191
81550,0rcu_preempt3-21ksoftirqd/012:34:130
81550,0rcu_preempt3-21ksoftirqd/009:49:080
81550,0rcu_preempt19-21ksoftirqd/109:39:211
81550,0rcu_preempt15620-21kworker/0:008:47:140
21977995511,0cyclictest25041-1kworker/0:2H11:18:260
21977995511,0cyclictest25041-1kworker/0:2H11:18:260
10050550,0irq/346-484840032242-1kworker/0:1H12:29:260
81540,0rcu_preempt3-21ksoftirqd/012:18:560
81540,0rcu_preempt3-21ksoftirqd/012:17:090
81540,0rcu_preempt3-21ksoftirqd/012:04:210
81540,0rcu_preempt3-21ksoftirqd/011:08:510
81540,0rcu_preempt3-21ksoftirqd/010:34:150
81540,0rcu_preempt3-21ksoftirqd/010:34:150
81540,0rcu_preempt3-21ksoftirqd/007:14:220
81540,0rcu_preempt3-21ksoftirqd/007:14:220
81540,0rcu_preempt30751-21ssh10:49:120
81540,0rcu_preempt18044-21df_inode11:09:100
10050540,0irq/346-48484008070-1kworker/0:1H10:30:190
81530,0rcu_preempt6119-21kworker/0:207:59:250
81530,0rcu_preempt3-21ksoftirqd/012:09:050
81530,0rcu_preempt3-21ksoftirqd/009:34:080
81530,0rcu_preempt3-21ksoftirqd/009:25:500
81530,0rcu_preempt3-21ksoftirqd/008:54:240
81530,0rcu_preempt3-21ksoftirqd/008:54:240
81530,0rcu_preempt1201-21ssh12:30:031
10050530,0irq/346-48484008071-1kworker/1:1H11:00:011
10050530,0irq/346-484840017400-1kworker/1:1H11:44:201
81520,0rcu_preempt3-21ksoftirqd/007:04:180
21977995215,0cyclictest27247-21munin-node0
10050520,0irq/346-484840020690-1kworker/0:2H10:20:030
81510,0rcu_preempt3-21ksoftirqd/010:58:080
81510,0rcu_preempt3-21ksoftirqd/010:58:080
81510,0rcu_preempt3-21ksoftirqd/010:44:180
81510,0rcu_preempt3-21ksoftirqd/009:19:170
81510,0rcu_preempt3-21ksoftirqd/009:04:230
81510,0rcu_preempt3-21ksoftirqd/008:24:120
10050510,0irq/346-48484007511-1kworker/1:1H11:31:371
10050510,0irq/346-4848400111rcuc/010:02:400
81500,0rcu_preempt3-21ksoftirqd/010:14:570
81500,0rcu_preempt3-21ksoftirqd/009:29:120
81500,0rcu_preempt19-21ksoftirqd/111:20:351
81500,0rcu_preempt19-21ksoftirqd/108:14:111
81500,0rcu_preempt19-21ksoftirqd/107:44:071
81490,0rcu_preempt3-21ksoftirqd/011:24:070
81490,0rcu_preempt3-21ksoftirqd/010:04:050
81490,0rcu_preempt3-21ksoftirqd/008:58:560
81490,0rcu_preempt3-21ksoftirqd/007:54:220
81490,0rcu_preempt28965-21diskmemload10:04:131
81490,0rcu_preempt19-21ksoftirqd/109:49:061
81490,0rcu_preempt15629-21irqstats11:39:140
2197799499,0cyclictest0-21swapper/011:03:100
21977994919,0cyclictest26322-21apt-get09:39:060
21977994912,0cyclictest0-21swapper/009:54:050
10050490,0irq/346-4848400851-21rngd10:13:180
10050490,0irq/346-484840054-21kswapd010:41:421
81480,0rcu_preempt3-21ksoftirqd/009:14:010
81480,0rcu_preempt3-21ksoftirqd/007:49:230
81480,0rcu_preempt25258-21ping07:29:210
81480,0rcu_preempt19-21ksoftirqd/110:46:361
81480,0rcu_preempt19-21ksoftirqd/108:29:061
81480,0rcu_preempt19-21ksoftirqd/107:54:061
81480,0rcu_preempt19-21ksoftirqd/107:29:151
81480,0rcu_preempt19-21ksoftirqd/107:19:181
21977994813,0cyclictest17961-1kworker/0:1H10:39:540
21977994810,0cyclictest32193-1kworker/0:1H11:57:070
9950470,0irq/345-48484005817-21ping07:59:131
81470,0rcu_preempt3-21ksoftirqd/011:49:110
81470,0rcu_preempt3-21ksoftirqd/011:38:240
81470,0rcu_preempt3-21ksoftirqd/009:10:120
81470,0rcu_preempt3-21ksoftirqd/008:49:160
81470,0rcu_preempt3-21ksoftirqd/008:17:090
81470,0rcu_preempt19-21ksoftirqd/111:09:051
81470,0rcu_preempt19-21ksoftirqd/109:13:571
81470,0rcu_preempt19-21ksoftirqd/108:24:101
81470,0rcu_preempt19-21ksoftirqd/108:21:211
81470,0rcu_preempt19-21ksoftirqd/108:04:101
81460,0rcu_preempt25258-21ping07:34:061
81460,0rcu_preempt19-21ksoftirqd/111:39:071
81460,0rcu_preempt19-21ksoftirqd/108:59:061
81460,0rcu_preempt12153-21apt-get12:09:051
10050460,0irq/346-484840054-21kswapd009:46:281
10050460,0irq/346-484840054-21kswapd009:22:251
81450,0rcu_preempt3-21ksoftirqd/008:04:250
81450,0rcu_preempt28965-21diskmemload11:17:071
81450,0rcu_preempt28965-21diskmemload11:17:071
81450,0rcu_preempt28965-21diskmemload11:05:451
81450,0rcu_preempt25258-21ping07:24:250
81450,0rcu_preempt19-21ksoftirqd/112:24:051
81450,0rcu_preempt19-21ksoftirqd/110:27:571
81450,0rcu_preempt19-21ksoftirqd/107:39:071
81450,0rcu_preempt12554-21timerandwakeup09:24:221
21977994515,0cyclictest0-21swapper/007:44:090
10050450,0irq/346-48484007260-21cut12:04:051
81440,0rcu_preempt3-21ksoftirqd/007:09:090
81440,0rcu_preempt28965-21diskmemload10:00:321
81440,0rcu_preempt21976-21cyclictest10:19:051
81440,0rcu_preempt19-21ksoftirqd/112:15:411
81440,0rcu_preempt19-21ksoftirqd/112:01:111
81440,0rcu_preempt19-21ksoftirqd/112:01:111
81440,0rcu_preempt19-21ksoftirqd/111:58:421
81440,0rcu_preempt19-21ksoftirqd/107:53:511
81430,0rcu_preempt6386-21kworker/1:008:49:401
81430,0rcu_preempt3-21ksoftirqd/008:29:140
81430,0rcu_preempt3-21ksoftirqd/007:19:570
81430,0rcu_preempt19-21ksoftirqd/110:49:231
81430,0rcu_preempt19-21ksoftirqd/110:09:041
81430,0rcu_preempt19-21ksoftirqd/109:11:171
81430,0rcu_preempt19-21ksoftirqd/108:54:081
81430,0rcu_preempt19-21ksoftirqd/108:54:081
81430,0rcu_preempt19-21ksoftirqd/108:44:061
81430,0rcu_preempt19-21ksoftirqd/108:09:061
81420,0rcu_preempt3-21ksoftirqd/007:34:100
81420,0rcu_preempt19-21ksoftirqd/112:23:321
81420,0rcu_preempt19-21ksoftirqd/109:56:081
81420,0rcu_preempt19-21ksoftirqd/109:04:071
81420,0rcu_preempt19-21ksoftirqd/107:14:071
81420,0rcu_preempt19-21ksoftirqd/107:14:071
81410,0rcu_preempt19-21ksoftirqd/111:52:251
81400,0rcu_preempt19-21ksoftirqd/108:39:061
81400,0rcu_preempt19-21ksoftirqd/107:09:081
81390,0rcu_preempt19-21ksoftirqd/108:34:221
81380,0rcu_preempt19-21ksoftirqd/107:03:571
2197799385,0cyclictest0-21swapper/007:39:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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