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2026-04-27 - 19:19

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 Mon Apr 27, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811260,0rcu_preempt3-21ksoftirqd/011:50:070
811110,0rcu_preempt3-21ksoftirqd/012:02:310
811050,0rcu_preempt19-21ksoftirqd/112:28:191
811010,0rcu_preempt19-21ksoftirqd/111:28:361
81970,0rcu_preempt19-21ksoftirqd/110:13:121
81880,0rcu_preempt19-21ksoftirqd/110:48:271
81860,0rcu_preempt19-21ksoftirqd/111:20:471
81860,0rcu_preempt0-21swapper/109:59:281
81840,0rcu_preempt54-21kswapd012:10:281
81830,0rcu_preempt4968-21ping08:20:041
81830,0rcu_preempt0-21swapper/111:52:391
81820,0rcu_preempt0-21swapper/111:45:421
81810,0rcu_preempt4968-21ping08:13:391
81810,0rcu_preempt19-21ksoftirqd/111:39:531
81810,0rcu_preempt19-21ksoftirqd/109:29:141
81790,0rcu_preempt54-21kswapd011:54:061
81770,0rcu_preempt0-21swapper/112:00:391
81770,0rcu_preempt0-21swapper/109:43:571
81760,0rcu_preempt28253-21diskmemload09:38:331
81750,0rcu_preempt0-21swapper/110:37:271
81740,0rcu_preempt19-21ksoftirqd/112:13:281
81740,0rcu_preempt19-21ksoftirqd/107:18:431
81740,0rcu_preempt19-21ksoftirqd/107:18:431
81730,0rcu_preempt19-21ksoftirqd/107:33:181
81720,0rcu_preempt32198-21kworker/1:112:05:111
81720,0rcu_preempt32198-21kworker/1:112:05:111
81720,0rcu_preempt19-21ksoftirqd/110:43:121
81720,0rcu_preempt0-21swapper/111:04:301
10050720,0irq/346-484840014755-1kworker/0:4H11:09:290
81700,0rcu_preempt19-21ksoftirqd/111:14:141
81700,0rcu_preempt0-21swapper/110:20:551
81700,0rcu_preempt0-21swapper/110:20:551
81700,0rcu_preempt0-21swapper/010:39:030
81680,0rcu_preempt3-21ksoftirqd/011:32:330
81680,0rcu_preempt19-21ksoftirqd/111:26:231
81680,0rcu_preempt0-21swapper/109:12:431
81670,0rcu_preempt19-21ksoftirqd/112:34:351
81670,0rcu_preempt19-21ksoftirqd/111:00:001
81670,0rcu_preempt19-21ksoftirqd/111:00:001
81670,0rcu_preempt19-21ksoftirqd/109:18:051
81660,0rcu_preempt19-21ksoftirqd/110:47:381
81660,0rcu_preempt19-21ksoftirqd/109:49:581
81650,0rcu_preempt18027-21apt-get10:03:301
81650,0rcu_preempt1067-21lighttpd12:19:471
81640,0rcu_preempt3-21ksoftirqd/011:18:330
81640,0rcu_preempt19-21ksoftirqd/109:20:241
81640,0rcu_preempt13664-21ssh09:25:451
81630,0rcu_preempt19-21ksoftirqd/110:54:001
81630,0rcu_preempt19-21ksoftirqd/109:54:381
2128399621,0cyclictest13320-21munin-node0
81610,0rcu_preempt19-21ksoftirqd/111:12:201
2128399612,0cyclictest23783-21grep07:13:440
81600,0rcu_preempt19-21ksoftirqd/111:37:491
2128399607,0cyclictest15108-1kworker/0:3H10:03:160
2128399602,0cyclictest8987-21ssh10:26:530
81590,0rcu_preempt19-21ksoftirqd/110:13:301
2128399592,0cyclictest0-21swapper/010:08:290
2128399583,0cyclictest2220150kworker/0:1H11:24:050
2128399582,0cyclictest7108-21apt12:03:280
2128399582,0cyclictest7108-21apt12:03:280
2128399582,0cyclictest0-21swapper/012:21:410
2128399582,0cyclictest0-21swapper/010:55:160
21283995815,0cyclictest0-21swapper/012:23:440
21283995810,0cyclictest68542chrt09:51:560
81570,0rcu_preempt19-21ksoftirqd/107:58:361
2128399573,0cyclictest0-21swapper/009:18:390
2128399572,0cyclictest26360-21munin-node0
2128399572,0cyclictest15108-1kworker/0:3H10:03:460
21283995715,0cyclictest2725-21ssh09:48:000
10050570,0irq/346-484840017851-1kworker/0:2H09:33:240
2128399563,0cyclictest0-21swapper/012:12:200
2128399563,0cyclictest0-21swapper/011:41:450
2128399562,0cyclictest8637-21runrttasks12:37:480
2128399562,0cyclictest18113-21munin-node0
2128399562,0cyclictest0-21swapper/009:14:330
2128399562,0cyclictest0-21swapper/007:38:550
21283995614,0cyclictest29542-21ssh09:42:090
21283995614,0cyclictest28556-21ssh09:08:300
2128399561,0cyclictest340-21ssh10:50:380
2128399561,0cyclictest16199-21ssh09:28:360
81550,0rcu_preempt19-21ksoftirqd/110:31:511
81550,0rcu_preempt19-21ksoftirqd/108:58:371
81550,0rcu_preempt19-21ksoftirqd/108:28:451
2128399553,0cyclictest0-21swapper/010:44:480
2128399552,0cyclictest0-21swapper/011:44:190
21283995513,0cyclictest0-21swapper/011:37:480
21283995513,0cyclictest0-21swapper/010:14:130
2128399551,0cyclictest20060-1kworker/0:2H10:18:220
2128399551,0cyclictest20060-1kworker/0:2H10:18:220
2128399551,0cyclictest1925-21ssh12:30:270
81540,0rcu_preempt3-21ksoftirqd/008:08:300
81540,0rcu_preempt24563-21ping07:23:311
81540,0rcu_preempt19-21ksoftirqd/112:29:001
81540,0rcu_preempt19-21ksoftirqd/110:26:091
2128399544,0cyclictest0-21swapper/010:28:290
2128399543,0cyclictest0-21swapper/010:33:380
2128399542,0cyclictest24563-21ping07:33:310
2128399542,0cyclictest22454-21munin-node0
2128399542,0cyclictest10661-21ssh11:01:060
2128399542,0cyclictest10661-21ssh11:01:060
2128399541,0cyclictest11839-21basename08:18:190
81530,0rcu_preempt19-21ksoftirqd/108:08:301
81530,0rcu_preempt1470-21runrttasks08:05:531
2128399536,0cyclictest28253-21diskmemload11:53:300
2128399532,0cyclictest24563-21ping07:18:300
2128399532,0cyclictest24563-21ping07:18:300
21283995316,0cyclictest0-21swapper/009:55:110
2128399531,0cyclictest24563-21ping07:28:350
81520,0rcu_preempt19-21ksoftirqd/108:53:321
81520,0rcu_preempt19-21ksoftirqd/107:48:381
2128399522,0cyclictest3394-21sshd07:51:030
2128399522,0cyclictest0-21swapper/009:03:320
2128399521,0cyclictest12077-21timerwakeupswit09:23:500
81510,0rcu_preempt19-21ksoftirqd/108:23:481
81510,0rcu_preempt19-21ksoftirqd/107:13:361
2128499512,0cyclictest21429-21apt-get07:08:301
2128399512,0cyclictest0-21swapper/008:48:400
2128399512,0cyclictest0-21swapper/008:38:460
2128399512,0cyclictest0-21swapper/008:38:030
2128399511,0cyclictest24563-21ping07:43:550
81500,0rcu_preempt19-21ksoftirqd/108:33:301
81500,0rcu_preempt19-21ksoftirqd/107:38:321
2128499502,0cyclictest20829-21munin-node1
2128399502,0cyclictest0-21swapper/008:53:320
81490,0rcu_preempt19-21ksoftirqd/109:03:331
2128399495,0cyclictest21460-21aten_rapower_cu07:08:310
2128399493,0cyclictest0-21swapper/008:58:370
2128399492,0cyclictest0-21swapper/008:45:170
81480,0rcu_preempt4968-21ping08:03:430
2128399482,0cyclictest0-21swapper/007:53:330
2128499471,0cyclictest24563-21ping07:43:331
81460,0rcu_preempt19-21ksoftirqd/108:43:381
81460,0rcu_preempt19-21ksoftirqd/107:53:461
81460,0rcu_preempt18772-21diskstats08:38:351
2128499461,0cyclictest22475-21munin-node1
81450,0rcu_preempt851-21rngd07:58:280
81450,0rcu_preempt19-21ksoftirqd/107:03:301
2128499452,0cyclictest24563-21ping07:35:031
2128399452,0cyclictest0-21swapper/008:24:030
2128399451,0cyclictest4968-21ping08:18:350
9950440,0irq/345-48484000-21swapper/007:03:470
81410,0rcu_preempt11676-21kworker/0:008:29:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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