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2026-06-30 - 09:02

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Tue Jun 30, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81770,0rcu_preempt19-21ksoftirqd/123:02:421
81740,0rcu_preempt19-21ksoftirqd/100:13:551
10050740,0irq/346-484840054-21kswapd022:16:570
10050740,0irq/346-484840054-21kswapd022:16:570
81720,0rcu_preempt851-21rngd23:46:041
1972699712,0cyclictest28034-1kworker/0:1H22:22:510
81700,0rcu_preempt3-21ksoftirqd/023:32:480
1972699702,0cyclictest380-1kworker/0:1H00:02:560
81690,0rcu_preempt5578-21kworker/0:120:04:270
81690,0rcu_preempt3-21ksoftirqd/021:57:340
81690,0rcu_preempt19-21ksoftirqd/122:34:001
81690,0rcu_preempt19-21ksoftirqd/122:34:001
1972699692,0cyclictest0-21swapper/000:22:500
81680,0rcu_preempt19-21ksoftirqd/123:47:471
1972699682,0cyclictest1335-21apt-get21:47:280
81670,0rcu_preempt26718-21diskmemload23:37:320
81670,0rcu_preempt19-21ksoftirqd/122:57:261
1972699679,0cyclictest0-21swapper/020:47:440
81660,0rcu_preempt19-21ksoftirqd/122:53:141
1972699661,0cyclictest11334-1kworker/0:0H21:25:190
1972699651,0cyclictest6428-1kworker/0:2H21:21:180
81640,0rcu_preempt3-21ksoftirqd/023:07:400
81640,0rcu_preempt32027-21aten_rapower_po00:32:310
1972699643,0cyclictest24978-1kworker/0:3H22:46:210
1972699643,0cyclictest24978-1kworker/0:3H22:46:210
1972699642,0cyclictest20002-21irqstats23:12:390
1972699642,0cyclictest0-21swapper/021:07:450
1972699641,0cyclictest5461-1kworker/0:0H22:28:580
1972699641,0cyclictest2339-21open_files23:27:400
1972699633,0cyclictest514-1kworker/0:2H22:19:520
1972699633,0cyclictest0-21swapper/022:57:010
1972699632,0cyclictest28962-21ssh23:55:340
10050630,0irq/346-484840019843-1kworker/0:2H00:21:510
81620,0rcu_preempt3-21ksoftirqd/022:02:280
1972699623,0cyclictest0-21swapper/022:57:410
1972699621,0cyclictest17690-21sendmail22:37:170
1972699621,0cyclictest17690-21sendmail22:37:170
1972699612,0cyclictest24662-21awk19:22:160
1972699612,0cyclictest0-21swapper/022:40:150
1972699612,0cyclictest0-21swapper/021:44:320
1972699612,0cyclictest0-21swapper/021:36:260
19726996113,0cyclictest0-21swapper/020:27:350
1972699611,0cyclictest32528-21latency21:12:390
81600,0rcu_preempt19-21ksoftirqd/121:49:011
1972699608,0cyclictest0-21swapper/000:09:590
1972699602,0cyclictest0-21swapper/023:21:200
1972699602,0cyclictest0-21swapper/019:47:350
1972699601,0cyclictest0-21swapper/022:08:280
1972699601,0cyclictest0-21swapper/000:27:290
81590,0rcu_preempt2963-21apt-get00:02:331
81590,0rcu_preempt19-21ksoftirqd/123:12:291
1972699598,0cyclictest17214-21ssh00:17:170
1972699592,0cyclictest7971-21seq21:53:260
1972699592,0cyclictest31181-21meminfo23:57:380
1972699592,0cyclictest13914-21ssh23:06:480
1972699591,0cyclictest30611-21ssh23:23:080
81580,0rcu_preempt3-21ksoftirqd/021:27:270
81580,0rcu_preempt19-21ksoftirqd/119:37:411
1972699582,0cyclictest0-21swapper/022:48:320
1972699581,0cyclictest26074-1kworker/0:1H21:42:160
81570,0rcu_preempt3-21ksoftirqd/019:52:390
81570,0rcu_preempt19-21ksoftirqd/121:57:181
81570,0rcu_preempt15363-21apt-get20:32:260
81570,0rcu_preempt0-21swapper/120:22:481
81570,0rcu_preempt0-21swapper/120:22:481
1972699572,0cyclictest0-21swapper/023:49:290
1972699571,0cyclictest30405-21munin-node0
10050570,0irq/346-484840026538-1kworker/1:3H23:20:211
10050570,0irq/346-484840020141-1kworker/1:0H22:42:271
10050570,0irq/346-484840020141-1kworker/1:0H22:42:271
81560,0rcu_preempt23596-21apt-get20:57:280
81560,0rcu_preempt23010-21ping19:27:491
81560,0rcu_preempt19-21ksoftirqd/123:37:381
1972699569,0cyclictest16180-21wget23:42:300
1972699562,0cyclictest0-21swapper/019:32:310
1972699561,0cyclictest3882-21munin-node0
1972699561,0cyclictest3882-21munin-node0
81550,0rcu_preempt9505-21kworker/1:120:17:431
81550,0rcu_preempt3-21ksoftirqd/020:52:330
81550,0rcu_preempt19-21ksoftirqd/123:34:281
81550,0rcu_preempt19-21ksoftirqd/122:08:411
81550,0rcu_preempt19-21ksoftirqd/121:23:521
81550,0rcu_preempt19-21ksoftirqd/121:12:471
81550,0rcu_preempt19-21ksoftirqd/121:07:361
81550,0rcu_preempt19-21ksoftirqd/119:47:381
81550,0rcu_preempt19-21ksoftirqd/100:20:061
1972699553,0cyclictest0-21swapper/020:22:310
1972699553,0cyclictest0-21swapper/020:22:310
81540,0rcu_preempt19-21ksoftirqd/122:49:271
81540,0rcu_preempt19-21ksoftirqd/122:41:401
81540,0rcu_preempt19-21ksoftirqd/122:25:021
81540,0rcu_preempt19-21ksoftirqd/120:27:341
1972699543,0cyclictest31532-21dropbear19:42:310
1972699542,0cyclictest21015-21sshd19:08:430
1972699542,0cyclictest0-21swapper/020:37:380
1972699542,0cyclictest0-21swapper/019:27:440
1972699541,0cyclictest23010-21ping19:22:300
10050540,0irq/346-484840054-21kswapd000:36:031
81530,0rcu_preempt19-21ksoftirqd/122:20:101
81530,0rcu_preempt19-21ksoftirqd/122:14:581
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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