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2026-03-31 - 05:34

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 highest latencies:
System rackaslot5s.osadl.org (updated Tue Mar 31, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811010,0rcu_preempt3-21ksoftirqd/022:39:400
811000,0rcu_preempt3-21ksoftirqd/021:11:030
81980,0rcu_preempt3-21ksoftirqd/023:47:530
81940,0rcu_preempt3-21ksoftirqd/022:01:080
81920,0rcu_preempt19-21ksoftirqd/100:04:101
81920,0rcu_preempt19-21ksoftirqd/100:04:101
10050820,0irq/346-484840024987-1kworker/1:2H21:47:121
10050820,0irq/346-484840024987-1kworker/1:2H21:47:121
81750,0rcu_preempt3-21ksoftirqd/021:46:220
81750,0rcu_preempt3-21ksoftirqd/021:46:220
81740,0rcu_preempt3-21ksoftirqd/023:51:320
81710,0rcu_preempt3-21ksoftirqd/023:26:540
81710,0rcu_preempt3-21ksoftirqd/022:21:370
81710,0rcu_preempt3-21ksoftirqd/022:14:150
81700,0rcu_preempt3-21ksoftirqd/000:14:210
81700,0rcu_preempt13668-21kworker/0:023:59:070
13453997010,0cyclictest0-21swapper/023:23:100
10050700,0irq/346-484840017016-1kworker/1:1H23:17:051
10050690,0irq/346-48484004631-21ssh21:24:321
10050690,0irq/346-48484004631-21ssh21:24:321
81680,0rcu_preempt3-21ksoftirqd/023:36:250
81680,0rcu_preempt10741-21apt-get20:38:560
1345399686,0cyclictest54-21kswapd021:15:000
81670,0rcu_preempt3-21ksoftirqd/020:29:080
81670,0rcu_preempt24921-21ssh23:24:001
81660,0rcu_preempt3-21ksoftirqd/020:34:100
1345399661,0cyclictest573-21ssh23:32:020
1345399661,0cyclictest573-21ssh23:32:020
10050660,0irq/346-484840054-21kswapd000:34:141
81650,0rcu_preempt3-21ksoftirqd/000:19:440
81640,0rcu_preempt3-21ksoftirqd/020:19:090
81640,0rcu_preempt3-21ksoftirqd/019:14:040
81640,0rcu_preempt18343-21php-cgi21:39:031
1345399641,0cyclictest1254-1kworker/0:2H00:08:140
1345399641,0cyclictest1254-1kworker/0:2H00:08:140
10050640,0irq/346-484840027662-1kworker/1:0H21:15:351
81630,0rcu_preempt3-21ksoftirqd/023:14:470
1345399632,0cyclictest0-21swapper/021:32:590
10050630,0irq/346-484840029576-1kworker/1:0H22:57:071
81620,0rcu_preempt54-21kswapd022:38:060
81620,0rcu_preempt23633-21diskstats00:29:000
1345399627,0cyclictest28398-21awk00:33:590
1345399623,0cyclictest1252-1kworker/0:0H00:09:490
1345399623,0cyclictest0-21swapper/022:48:380
81610,0rcu_preempt54-21kswapd023:02:090
81610,0rcu_preempt3-21ksoftirqd/020:14:050
13453996111,0cyclictest3713-21ssh21:56:560
1345399611,0cyclictest0-21swapper/021:21:330
10050610,0irq/346-484840032614-1kworker/1:2H21:23:211
10050610,0irq/346-484840029346-1kworker/1:3H23:32:391
10050610,0irq/346-484840029346-1kworker/1:3H23:32:391
81600,0rcu_preempt3-21ksoftirqd/020:44:070
1345399606,0cyclictest20446-21diskmemload23:04:110
1345399602,0cyclictest18961-21apt-get21:03:570
1345399602,0cyclictest0-21swapper/022:10:090
1345399601,0cyclictest13177-21munin-node0
10050600,0irq/346-48484005155-1kworker/1:1H21:32:201
81590,0rcu_preempt3-21ksoftirqd/020:54:080
1345399593,0cyclictest19116-21irqstats00:24:060
1345399592,0cyclictest22915-21munin-node0
1345399592,0cyclictest0-21swapper/019:08:580
1345399591,0cyclictest30090-21ssh22:23:570
10050590,0irq/346-484840027245-1kworker/1:0H22:25:171
10050590,0irq/346-484840021358-21ssh23:19:431
81580,0rcu_preempt3-21ksoftirqd/022:54:100
13453995821,0cyclictest0-21swapper/022:31:310
1345399582,0cyclictest0-21swapper/021:25:000
1345399582,0cyclictest0-21swapper/021:25:000
1345399581,0cyclictest7087-1kworker/0:2H23:09:510
1345399581,0cyclictest21654-21apt-get23:53:590
10050580,0irq/346-48484008509-21ps22:34:121
10050580,0irq/346-48484004342-1kworker/1:0H23:40:091
1345399574,0cyclictest30435-21ssh21:50:580
1345399572,0cyclictest14196-21df20:48:590
1345399572,0cyclictest0-21swapper/023:39:440
1345399572,0cyclictest0-21swapper/022:04:540
1345399572,0cyclictest0-21swapper/019:23:450
10050570,0irq/346-48484009711-1kworker/1:3H22:43:541
10050570,0irq/346-484840029930-1kworker/1:1H21:55:181
81560,0rcu_preempt3-21ksoftirqd/020:59:080
81560,0rcu_preempt3-21ksoftirqd/019:54:090
1345399562,0cyclictest19589-21ssh21:39:400
1345399562,0cyclictest0-21swapper/020:03:570
10050560,0irq/346-48484006162-1kworker/1:2H00:11:431
10050560,0irq/346-484840028802-1kworker/1:3H00:00:531
10050560,0irq/346-484840014132-1kworker/1:1H23:47:331
10050560,0irq/346-48484000-21swapper/121:11:021
1345399552,0cyclictest0-21swapper/020:24:020
1345399552,0cyclictest0-21swapper/020:08:580
10050550,0irq/346-484840023896-1kworker/1:0H23:57:391
1345399542,0cyclictest0-21swapper/019:24:070
1345399541,0cyclictest25301-21munin-node0
10050540,0irq/346-484840027245-1kworker/1:0H22:21:041
10050540,0irq/346-484840025733-1kworker/1:2H00:30:581
10050540,0irq/346-48484002126-1kworker/1:2H23:02:301
10050540,0irq/346-484840017331-1kworker/1:1H22:11:551
10050540,0irq/346-48484000-21swapper/123:08:321
1345399532,0cyclictest29841-1kworker/0:1H19:59:100
1345399532,0cyclictest29841-1kworker/0:1H19:59:100
1345399531,0cyclictest27487-21munin-node0
10050530,0irq/346-48484009711-1kworker/1:3H22:41:041
10050530,0irq/346-484840022407-21ssh22:15:341
10050530,0irq/346-484840015967-1kworker/1:0H00:23:301
10050530,0irq/346-484840011045-1kworker/1:1H00:17:541
1345399522,0cyclictest16741-21ping19:38:570
1345399521,0cyclictest16741-21ping19:33:570
1345399521,0cyclictest16741-21ping19:28:580
10050520,0irq/346-48484005155-1kworker/1:1H21:34:521
10050520,0irq/346-484840029930-1kworker/1:1H21:52:231
9950510,0irq/345-484840012058-1kworker/1:3H23:13:451
10050510,0irq/346-484840020857-21ssh23:53:051
81500,0rcu_preempt19-21ksoftirqd/119:34:041
10050500,0irq/346-484840024618-1kworker/1:1H22:51:211
10050500,0irq/346-48484000-21swapper/122:01:061
9950490,0irq/345-484840012380-1kworker/1:0H22:08:331
10050490,0irq/346-484840022542-21ssh00:27:591
9950480,0irq/345-48484001345499cyclictest20:11:021
1345399472,0cyclictest0-21swapper/019:08:450
10050470,0irq/346-48484004108-21ssh23:35:161
10050470,0irq/346-48484000-21swapper/120:28:571
81460,0rcu_preempt23647-21kworker/1:219:03:551
10050460,0irq/346-48484000-21swapper/122:33:221
9950450,0irq/345-48484000-21swapper/121:08:451
81450,0rcu_preempt19-21ksoftirqd/119:59:131
81450,0rcu_preempt19-21ksoftirqd/119:59:131
9950440,0irq/345-484840026304-1kworker/1:2H19:50:591
81440,0rcu_preempt23647-21kworker/1:220:04:111
9950430,0irq/345-48484000-21swapper/119:09:011
81430,0rcu_preempt23647-21kworker/1:219:29:241
81430,0rcu_preempt19-21ksoftirqd/119:23:451
81420,0rcu_preempt29851-21munin-run19:58:441
81420,0rcu_preempt19-21ksoftirqd/119:24:021
9950410,0irq/345-484840014811-1kworker/1:2H19:15:531
81410,0rcu_preempt19-21ksoftirqd/119:44:181
81410,0rcu_preempt19-21ksoftirqd/119:38:581
81400,0rcu_preempt19-21ksoftirqd/120:23:451
81380,0rcu_preempt10569-21latency_hist20:38:461
81370,0rcu_preempt19-21ksoftirqd/120:54:121
81370,0rcu_preempt19-21ksoftirqd/120:49:121
81360,0rcu_preempt29605-21ping20:24:171
81360,0rcu_preempt19-21ksoftirqd/120:14:111
81350,0rcu_preempt19-21ksoftirqd/120:59:061
81350,0rcu_preempt19-21ksoftirqd/120:33:451
81330,0rcu_preempt12373-21munin-node1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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