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2026-04-11 - 15:39

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 50 highest latencies:
System rackaslot5s.osadl.org (updated Sat Apr 11, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811340,0rcu_preempt19-21ksoftirqd/108:09:001
811300,0rcu_preempt19-21ksoftirqd/111:04:221
811210,0rcu_preempt23368-1kworker/1:0H10:54:001
811130,0rcu_preempt19-21ksoftirqd/112:37:061
811110,0rcu_preempt19-21ksoftirqd/108:06:251
81980,0rcu_preempt19-21ksoftirqd/110:23:571
81900,0rcu_preempt19-21ksoftirqd/111:29:011
81830,0rcu_preempt16397-21kworker/0:111:54:570
81750,0rcu_preempt14584-21apt-get07:13:450
81740,0rcu_preempt19-21ksoftirqd/111:08:491
81710,0rcu_preempt19-21ksoftirqd/112:04:001
81700,0rcu_preempt3-21ksoftirqd/009:13:510
81690,0rcu_preempt19-21ksoftirqd/107:29:011
81670,0rcu_preempt19-21ksoftirqd/110:05:311
81670,0rcu_preempt19-21ksoftirqd/109:43:341
81650,0rcu_preempt28978-21ping08:08:450
81650,0rcu_preempt19-21ksoftirqd/111:39:271
81640,0rcu_preempt3-21ksoftirqd/008:04:040
81640,0rcu_preempt18551-21ssh12:24:000
81630,0rcu_preempt54-21kswapd009:43:430
81630,0rcu_preempt19-21ksoftirqd/112:00:091
81620,0rcu_preempt3-21ksoftirqd/009:31:360
81620,0rcu_preempt3-21ksoftirqd/009:31:360
12798996216,0cyclictest19430-21ssh10:13:480
81610,0rcu_preempt3-21ksoftirqd/011:24:000
81610,0rcu_preempt19-21ksoftirqd/111:44:031
81610,0rcu_preempt19-21ksoftirqd/109:43:171
81610,0rcu_preempt19-21ksoftirqd/109:17:341
81610,0rcu_preempt19-21ksoftirqd/107:08:341
81610,0rcu_preempt16472-21kworker/0:007:48:580
12798996119,0cyclictest7447-21ssh12:13:330
12798996116,0cyclictest244832sleep009:13:140
12798996115,0cyclictest0-21swapper/011:29:570
81600,0rcu_preempt19-21ksoftirqd/111:50:541
81600,0rcu_preempt19-21ksoftirqd/111:33:441
12798996019,0cyclictest6195-21munin-run10:33:340
12798996015,0cyclictest0-21swapper/010:19:130
81590,0rcu_preempt3-21ksoftirqd/009:38:530
12798995919,0cyclictest27717-1kworker/0:0H12:03:510
12798995915,0cyclictest0-21swapper/010:37:010
12798995914,0cyclictest0-21swapper/009:58:100
81580,0rcu_preempt23334-21ntp_states12:28:580
12798995814,0cyclictest0-21swapper/011:21:540
12798995813,0cyclictest0-21swapper/009:59:100
81570,0rcu_preempt3-21ksoftirqd/010:39:400
81570,0rcu_preempt3-21ksoftirqd/008:24:340
12798995721,0cyclictest15633-21munin-node0
12798995713,0cyclictest0-21swapper/010:27:340
12798995713,0cyclictest0-21swapper/010:08:390
10050570,0irq/346-4848400110962sleep012:16:520
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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