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2025-11-15 - 21:27

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 Sat Nov 15, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81800,0rcu_preempt31483-21cyclictest11:25:031
81770,0rcu_preempt0-21swapper/009:17:130
81760,0rcu_preempt54-21kswapd008:15:060
81710,0rcu_preempt19-21ksoftirqd/107:42:371
69762710,0sleep09950irq/345-484840010:42:540
81700,0rcu_preempt3-21ksoftirqd/010:25:090
39512700,0sleep09950irq/345-484840012:07:500
81690,0rcu_preempt1163-21kworker/0:109:14:170
81680,0rcu_preempt3-21ksoftirqd/009:53:340
81680,0rcu_preempt3-21ksoftirqd/009:34:530
81680,0rcu_preempt19-21ksoftirqd/111:20:111
81670,0rcu_preempt4720-21apt-get11:24:530
81660,0rcu_preempt9510-21kworker/0:010:03:160
81630,0rcu_preempt54-21kswapd009:08:360
81630,0rcu_preempt3-21ksoftirqd/008:54:580
81620,0rcu_preempt29768-21kworker/0:212:03:430
81620,0rcu_preempt21595-21kworker/0:211:04:360
81610,0rcu_preempt3-21ksoftirqd/011:44:530
81610,0rcu_preempt0-21swapper/007:58:390
81600,0rcu_preempt0-21swapper/011:14:490
81600,0rcu_preempt0-21swapper/010:20:020
10050600,0irq/346-484840054-21kswapd010:41:121
81590,0rcu_preempt3-21ksoftirqd/010:29:560
81590,0rcu_preempt0-21swapper/012:24:270
81590,0rcu_preempt0-21swapper/009:57:560
81580,0rcu_preempt3-21ksoftirqd/008:39:530
81580,0rcu_preempt0-21swapper/011:36:560
81580,0rcu_preempt0-21swapper/011:22:410
81580,0rcu_preempt0-21swapper/010:56:090
81580,0rcu_preempt0-21swapper/010:54:020
81580,0rcu_preempt0-21swapper/010:49:120
222252580,0sleep010050irq/346-484840008:20:010
222252580,0sleep010050irq/346-484840008:20:010
10050580,0irq/346-48484000-21swapper/011:29:580
81570,0rcu_preempt6757-21kworker/u4:010:35:550
81570,0rcu_preempt1239-21snmpd11:41:160
81570,0rcu_preempt0-21swapper/012:39:030
81570,0rcu_preempt0-21swapper/012:33:410
81570,0rcu_preempt0-21swapper/012:29:050
81570,0rcu_preempt0-21swapper/012:16:060
81570,0rcu_preempt0-21swapper/011:56:100
81570,0rcu_preempt0-21swapper/009:27:050
81570,0rcu_preempt0-21swapper/008:54:240
81560,0rcu_preempt3-21ksoftirqd/008:00:110
81560,0rcu_preempt0-21swapper/011:08:520
81560,0rcu_preempt0-21swapper/009:24:000
81550,0rcu_preempt54-21kswapd007:29:160
81550,0rcu_preempt3-21ksoftirqd/011:09:530
81550,0rcu_preempt3-21ksoftirqd/010:09:510
81550,0rcu_preempt3-21ksoftirqd/009:29:530
81550,0rcu_preempt3-21ksoftirqd/007:50:070
81550,0rcu_preempt0-21swapper/009:41:110
81550,0rcu_preempt0-21swapper/007:10:070
81540,0rcu_preempt3-21ksoftirqd/008:59:530
81540,0rcu_preempt3-21ksoftirqd/007:44:110
81540,0rcu_preempt3-21ksoftirqd/007:35:000
81540,0rcu_preempt3-21ksoftirqd/007:32:060
81540,0rcu_preempt0-21swapper/008:45:080
77122540,0sleep09950irq/345-484840012:11:520
59322540,0sleep19950irq/345-484840012:10:041
81530,0rcu_preempt3-21ksoftirqd/008:34:530
81530,0rcu_preempt3-21ksoftirqd/007:22:530
185812530,0sleep010050irq/346-484840008:08:210
10050530,0irq/346-484840010954-1kworker/1:4H09:20:361
9950520,0irq/345-484840011272-21latency07:45:101
10050520,0irq/346-484840016897-1kworker/1:0H10:14:581
81510,0rcu_preempt3-21ksoftirqd/007:46:250
81510,0rcu_preempt0-21swapper/010:07:060
10050510,0irq/346-4848400751-21rngd09:39:581
10050510,0irq/346-484840029920-1kworker/1:4H12:38:421
10050510,0irq/346-484840017578-1kworker/1:1H11:45:431
81500,0rcu_preempt3-21ksoftirqd/010:15:440
81500,0rcu_preempt3-21ksoftirqd/009:44:520
81500,0rcu_preempt19-21ksoftirqd/111:37:471
81500,0rcu_preempt19-21ksoftirqd/107:19:421
46162500,0sleep19950irq/345-484840009:55:031
10050500,0irq/346-484840013361-1kworker/1:1H10:59:571
81490,0rcu_preempt3-21ksoftirqd/011:50:000
81490,0rcu_preempt3-21ksoftirqd/008:25:180
81490,0rcu_preempt3-21ksoftirqd/007:14:520
81490,0rcu_preempt3-21ksoftirqd/007:14:520
10050490,0irq/346-48484006044-1kworker/1:0H10:00:011
10050490,0irq/346-484840026435-21taskset11:10:011
10050490,0irq/346-484840021431-1kworker/1:0H12:05:071
10050490,0irq/346-484840017508-1kworker/1:1H09:36:081
10050490,0irq/346-484840015550-1kworker/1:0H09:25:141
81480,0rcu_preempt3-21ksoftirqd/008:30:080
81480,0rcu_preempt17227-21kworker/0:008:09:550
81480,0rcu_preempt17227-21kworker/0:008:09:550
10050480,0irq/346-484840013858-1kworker/1:0H11:39:431
10050480,0irq/346-48484000-21swapper/110:39:321
81470,0rcu_preempt19-21ksoftirqd/107:59:521
81460,0rcu_preempt19-21ksoftirqd/110:29:531
81460,0rcu_preempt1-21init07:29:531
10050460,0irq/346-48484002353-21ping07:25:151
81450,0rcu_preempt19-21ksoftirqd/107:34:541
10050450,0irq/346-484840015048-21ssh10:54:531
10050450,0irq/346-48484000-21swapper/108:39:411
81440,0rcu_preempt19-21ksoftirqd/111:49:561
81440,0rcu_preempt19-21ksoftirqd/110:44:531
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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