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2026-08-18 - 17:55

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 Tue Aug 18, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81940,0rcu_preempt19-21ksoftirqd/110:25:241
81900,0rcu_preempt0-21swapper/109:09:521
81870,0rcu_preempt19-21ksoftirqd/112:20:061
81830,0rcu_preempt1591-21kworker/0:110:48:420
81800,0rcu_preempt19-21ksoftirqd/111:16:311
81780,0rcu_preempt3-21ksoftirqd/011:28:070
81770,0rcu_preempt3-21ksoftirqd/012:16:110
81760,0rcu_preempt3-21ksoftirqd/010:17:340
81740,0rcu_preempt3-21ksoftirqd/009:55:350
81740,0rcu_preempt3-21ksoftirqd/009:55:350
81730,0rcu_preempt3-21ksoftirqd/009:16:350
81720,0rcu_preempt3-21ksoftirqd/011:40:520
81720,0rcu_preempt3-21ksoftirqd/009:14:230
81720,0rcu_preempt10550-21ssh10:22:460
81710,0rcu_preempt3-21ksoftirqd/011:58:510
81710,0rcu_preempt19-21ksoftirqd/112:06:221
81700,0rcu_preempt3-21ksoftirqd/011:05:410
81690,0rcu_preempt3-21ksoftirqd/009:39:300
81690,0rcu_preempt3-21ksoftirqd/009:31:120
81690,0rcu_preempt19-21ksoftirqd/110:20:081
81680,0rcu_preempt19-21ksoftirqd/110:57:341
81680,0rcu_preempt19-21ksoftirqd/110:43:521
81680,0rcu_preempt19-21ksoftirqd/109:56:341
81680,0rcu_preempt19-21ksoftirqd/109:56:341
81670,0rcu_preempt3-21ksoftirqd/011:31:440
81670,0rcu_preempt3-21ksoftirqd/009:49:370
81670,0rcu_preempt19-21ksoftirqd/111:50:141
81650,0rcu_preempt19-21ksoftirqd/112:17:281
81650,0rcu_preempt19-21ksoftirqd/112:02:081
81650,0rcu_preempt19-21ksoftirqd/111:22:331
81650,0rcu_preempt19-21ksoftirqd/110:48:531
81640,0rcu_preempt19-21ksoftirqd/109:37:051
10050640,0irq/346-484840019-21ksoftirqd/111:38:191
9950630,0irq/345-4848400181ktimersoftd/110:38:531
81630,0rcu_preempt19-21ksoftirqd/112:10:071
81630,0rcu_preempt19-21ksoftirqd/112:10:071
81630,0rcu_preempt19-21ksoftirqd/109:20:001
10050630,0irq/346-48484006642-1kworker/0:2H10:54:450
10050630,0irq/346-484840019-21ksoftirqd/110:52:271
81620,0rcu_preempt19-21ksoftirqd/112:27:001
81620,0rcu_preempt19-21ksoftirqd/110:17:251
81620,0rcu_preempt19-21ksoftirqd/110:02:471
81620,0rcu_preempt19-21ksoftirqd/110:02:471
81620,0rcu_preempt19-21ksoftirqd/109:40:121
81620,0rcu_preempt0-21swapper/112:37:291
10050620,0irq/346-4848400171rcuc/111:00:031
81610,0rcu_preempt19-21ksoftirqd/109:50:061
81610,0rcu_preempt19-21ksoftirqd/109:50:061
81610,0rcu_preempt19-21ksoftirqd/109:29:591
10050610,0irq/346-484840081rcu_preempt11:05:481
81600,0rcu_preempt19-21ksoftirqd/111:56:281
9950590,0irq/345-4848400171rcuc/109:48:061
81590,0rcu_preempt3-21ksoftirqd/007:25:080
81590,0rcu_preempt19-21ksoftirqd/111:41:181
81590,0rcu_preempt19-21ksoftirqd/109:17:361
10050590,0irq/346-484840027083-1kworker/1:1H10:10:031
81570,0rcu_preempt3-21ksoftirqd/011:45:420
81570,0rcu_preempt3-21ksoftirqd/011:34:580
81570,0rcu_preempt19-21ksoftirqd/107:49:551
81560,0rcu_preempt19-21ksoftirqd/109:29:191
10050560,0irq/346-484840016452-1kworker/0:1H11:02:180
9950550,0irq/345-4848400171rcuc/110:30:091
81550,0rcu_preempt3-21ksoftirqd/012:35:110
81540,0rcu_preempt3-21ksoftirqd/010:41:380
81540,0rcu_preempt28973-21apt-get11:14:530
81540,0rcu_preempt19906-21kworker/0:208:25:290
10050540,0irq/346-484840032005-1kworker/0:2H10:12:060
10050540,0irq/346-484840024247-1kworker/0:0H10:37:270
10050540,0irq/346-48484002378-1kworker/0:2H09:44:320
81530,0rcu_preempt3-21ksoftirqd/011:10:080
81530,0rcu_preempt3-21ksoftirqd/010:30:100
81530,0rcu_preempt3-21ksoftirqd/010:04:580
81520,0rcu_preempt15379-21kworker/0:009:50:130
81520,0rcu_preempt15379-21kworker/0:009:50:130
10050520,0irq/346-4848400181ktimersoftd/112:33:261
9950510,0irq/345-4848400181ktimersoftd/111:31:021
9950510,0irq/345-4848400171rcuc/111:44:471
81510,0rcu_preempt3-21ksoftirqd/012:30:060
81510,0rcu_preempt3-21ksoftirqd/012:24:530
81510,0rcu_preempt3-21ksoftirqd/012:00:070
81510,0rcu_preempt3-21ksoftirqd/010:00:000
81510,0rcu_preempt3-21ksoftirqd/010:00:000
81510,0rcu_preempt3-21ksoftirqd/009:00:040
81510,0rcu_preempt3-21ksoftirqd/007:50:060
81510,0rcu_preempt3-21ksoftirqd/007:15:050
81510,0rcu_preempt19-21ksoftirqd/109:09:421
81510,0rcu_preempt19-21ksoftirqd/107:18:351
10050510,0irq/346-484840015003-1kworker/0:1H09:27:160
9950500,0irq/345-4848400171rcuc/107:30:091
81500,0rcu_preempt3-21ksoftirqd/010:25:130
81500,0rcu_preempt3-21ksoftirqd/008:20:420
81500,0rcu_preempt3-21ksoftirqd/008:02:510
81500,0rcu_preempt19-21ksoftirqd/108:10:111
81500,0rcu_preempt19-21ksoftirqd/107:45:161
10050500,0irq/346-48484008095-1kworker/0:2H09:20:530
81490,0rcu_preempt3-21ksoftirqd/012:09:150
81490,0rcu_preempt3-21ksoftirqd/011:51:240
81490,0rcu_preempt3-21ksoftirqd/010:50:020
81490,0rcu_preempt3-21ksoftirqd/008:07:020
10050490,0irq/346-48484000-21swapper/108:45:051
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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