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2026-03-22 - 07:09

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 Sun Mar 22, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811140,0rcu_preempt54-21kswapd023:01:091
811120,0rcu_preempt851-21rngd23:50:511
811080,0rcu_preempt19-21ksoftirqd/121:26:301
811080,0rcu_preempt19-21ksoftirqd/121:13:151
811020,0rcu_preempt19-21ksoftirqd/123:12:551
81940,0rcu_preempt19-21ksoftirqd/122:44:371
81940,0rcu_preempt19-21ksoftirqd/100:05:041
81930,0rcu_preempt19-21ksoftirqd/122:16:471
81900,0rcu_preempt19-21ksoftirqd/119:44:151
81870,0rcu_preempt19-21ksoftirqd/120:34:201
81850,0rcu_preempt19-21ksoftirqd/123:45:341
81850,0rcu_preempt19-21ksoftirqd/119:38:531
81850,0rcu_preempt19-21ksoftirqd/119:38:531
81840,0rcu_preempt19-21ksoftirqd/123:26:101
81820,0rcu_preempt19-21ksoftirqd/100:37:271
81810,0rcu_preempt19-21ksoftirqd/122:36:351
81810,0rcu_preempt19-21ksoftirqd/120:19:131
81800,0rcu_preempt19-21ksoftirqd/123:05:191
81800,0rcu_preempt19-21ksoftirqd/122:54:201
81800,0rcu_preempt19-21ksoftirqd/121:40:341
81800,0rcu_preempt11917-21sh21:54:041
81780,0rcu_preempt19-21ksoftirqd/121:47:071
81780,0rcu_preempt19-21ksoftirqd/119:27:221
81770,0rcu_preempt19-21ksoftirqd/123:58:451
81760,0rcu_preempt19-21ksoftirqd/122:09:141
81760,0rcu_preempt19-21ksoftirqd/121:31:231
81760,0rcu_preempt19-21ksoftirqd/121:22:031
81760,0rcu_preempt19-21ksoftirqd/121:18:331
81760,0rcu_preempt19-21ksoftirqd/119:43:531
81760,0rcu_preempt19-21ksoftirqd/119:09:131
81750,0rcu_preempt54-21kswapd023:34:211
81750,0rcu_preempt19-21ksoftirqd/120:04:191
81740,0rcu_preempt19-21ksoftirqd/122:19:171
81740,0rcu_preempt19-21ksoftirqd/121:35:441
81740,0rcu_preempt19-21ksoftirqd/119:59:221
81740,0rcu_preempt19-21ksoftirqd/119:21:271
81730,0rcu_preempt54-21kswapd023:19:111
81730,0rcu_preempt19-21ksoftirqd/121:50:451
2512699736,0cyclictest1944-1kworker/0:1H22:45:470
2512699736,0cyclictest13231-1kworker/0:3H23:02:500
81720,0rcu_preempt19-21ksoftirqd/120:09:171
81720,0rcu_preempt19-21ksoftirqd/119:14:191
81710,0rcu_preempt19-21ksoftirqd/123:39:201
81710,0rcu_preempt19-21ksoftirqd/123:29:131
81710,0rcu_preempt19-21ksoftirqd/122:51:091
81710,0rcu_preempt19-21ksoftirqd/100:09:201
81700,0rcu_preempt19-21ksoftirqd/123:59:151
81690,0rcu_preempt19-21ksoftirqd/121:59:161
81690,0rcu_preempt19-21ksoftirqd/120:24:201
81690,0rcu_preempt19-21ksoftirqd/119:54:191
81690,0rcu_preempt19-21ksoftirqd/100:28:071
81680,0rcu_preempt3-21ksoftirqd/023:45:580
81680,0rcu_preempt19-21ksoftirqd/100:15:301
2512699681,0cyclictest22779-21taskset00:16:070
81670,0rcu_preempt19-21ksoftirqd/122:29:071
81660,0rcu_preempt19-21ksoftirqd/100:31:481
81660,0rcu_preempt19-21ksoftirqd/100:19:141
2512699667,0cyclictest30121-21ssh00:24:040
2512699651,0cyclictest25598-21taskset22:39:550
10050650,0irq/346-484840023029-1kworker/0:2H23:12:250
2512699642,0cyclictest28025-21ssh23:49:050
2512699642,0cyclictest0-21swapper/022:34:060
2512699632,0cyclictest28381-21ssh22:09:510
2512699621,0cyclictest11828-21ssh21:53:570
2512699621,0cyclictest11292-21munin-node0
81610,0rcu_preempt3-21ksoftirqd/023:14:190
81610,0rcu_preempt19-21ksoftirqd/123:16:411
81610,0rcu_preempt19-21ksoftirqd/122:06:261
81610,0rcu_preempt19-21ksoftirqd/122:06:261
2512699615,0cyclictest24899-1kworker/0:1H00:32:080
2512699612,0cyclictest20076-21ssh23:07:550
2512699611,0cyclictest31979-21ssh22:14:100
2512699611,0cyclictest31828-1kworker/0:1H21:08:590
2512699609,0cyclictest54-21kswapd022:05:390
2512699609,0cyclictest54-21kswapd022:05:390
2512699602,0cyclictest4736-21latency_hist21:13:540
2512699602,0cyclictest25175-21munin-node0
2512699602,0cyclictest19487-1kworker/0:1H22:01:380
2512699601,0cyclictest5300-21chrt22:52:530
2512699593,0cyclictest0-21swapper/022:20:460
2512699592,0cyclictest22644-21cut20:39:070
2512699592,0cyclictest16232-21runrttasks23:36:370
2512699592,0cyclictest0-21swapper/023:19:040
2512699591,0cyclictest19660-21ssh21:29:030
2512699591,0cyclictest0-21swapper/000:37:270
2512699585,0cyclictest0-21swapper/023:43:140
2512699582,0cyclictest16844-21rm21:25:280
2512699582,0cyclictest0-21swapper/020:49:090
2512699582,0cyclictest0-21swapper/019:14:040
2512699582,0cyclictest0-21swapper/019:09:060
2512699573,0cyclictest0-21swapper/021:44:510
2512699573,0cyclictest0-21swapper/000:09:170
2512699572,0cyclictest0-21swapper/020:29:180
2512699571,0cyclictest30060-1kworker/0:3H23:59:160
81560,0rcu_preempt19-21ksoftirqd/120:59:151
2512699564,0cyclictest54-21kswapd021:42:410
2512699563,0cyclictest28404-21ping19:24:060
2512699562,0cyclictest1944-1kworker/0:1H22:29:290
2512699562,0cyclictest0-21swapper/023:29:110
2512699562,0cyclictest0-21swapper/023:24:110
2512699562,0cyclictest0-21swapper/021:36:460
2512699562,0cyclictest0-21swapper/019:35:490
2512699562,0cyclictest0-21swapper/019:35:490
25126995614,0cyclictest23611-1kworker/0:0H20:44:030
2512699558,0cyclictest4080-1kworker/0:1H22:54:320
2512699556,0cyclictest12077-21ssh21:20:410
2512699552,0cyclictest1085-21ssh23:54:130
2512699552,0cyclictest0-21swapper/022:28:160
2512699552,0cyclictest0-21swapper/020:34:100
2512699551,0cyclictest4608-1kworker/0:3H21:50:200
2512699551,0cyclictest27326-21munin-node0
81540,0rcu_preempt19-21ksoftirqd/120:14:151
2512699547,0cyclictest0-21swapper/020:14:140
2512699542,0cyclictest0-21swapper/020:04:050
2512699541,0cyclictest32114-21awk21:08:530
81530,0rcu_preempt19-21ksoftirqd/122:39:241
81530,0rcu_preempt19-21ksoftirqd/122:24:221
81530,0rcu_preempt19-21ksoftirqd/119:49:101
2512699532,0cyclictest436-21munin-node0
2512699532,0cyclictest0-21swapper/019:49:120
2512699531,0cyclictest8935-21ping20:12:140
81520,0rcu_preempt22582-21dropbear20:39:041
2512699522,0cyclictest0-21swapper/020:59:550
2512699522,0cyclictest0-21swapper/019:58:530
25126995214,0cyclictest0-21swapper/019:59:150
2512699521,0cyclictest0-21swapper/020:19:340
2512699512,0cyclictest4116-21runrttasks19:43:070
2512699492,0cyclictest0-21swapper/020:24:170
81480,0rcu_preempt24242-21df_inode20:44:061
2512699482,0cyclictest0-21swapper/019:44:150
2512699481,0cyclictest29872-21runrttasks19:21:590
81460,0rcu_preempt19-21ksoftirqd/120:54:161
81460,0rcu_preempt19-21ksoftirqd/120:29:201
81440,0rcu_preempt19-21ksoftirqd/119:04:011
2512699442,0cyclictest25116-21munin-run19:08:530
81430,0rcu_preempt30821-21df_inode21:04:091
81410,0rcu_preempt19-21ksoftirqd/120:49:111
81320,0rcu_preempt19-21ksoftirqd/119:31:371
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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