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2026-04-26 - 02:57

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Sun Apr 26, 2026 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81780,0rcu_preempt3-21ksoftirqd/000:23:450
81740,0rcu_preempt3-21ksoftirqd/023:00:160
81740,0rcu_preempt3-21ksoftirqd/000:16:340
10050730,0irq/346-484840029053-1kworker/0:3H23:17:350
81710,0rcu_preempt3-21ksoftirqd/022:43:490
10050710,0irq/346-484840026340-1kworker/0:0H00:04:090
81700,0rcu_preempt3-21ksoftirqd/021:53:190
81700,0rcu_preempt3-21ksoftirqd/021:38:320
81700,0rcu_preempt3-21ksoftirqd/021:38:320
81670,0rcu_preempt3-21ksoftirqd/023:28:390
10050670,0irq/346-484840014971-1kworker/0:2H22:17:520
81660,0rcu_preempt851-21rngd22:04:190
81660,0rcu_preempt32451-21dropbear21:58:370
81660,0rcu_preempt3-21ksoftirqd/023:53:500
81650,0rcu_preempt3-21ksoftirqd/000:38:200
81640,0rcu_preempt19-21ksoftirqd/120:24:541
81640,0rcu_preempt19-21ksoftirqd/120:21:581
10050640,0irq/346-48484006221-1kworker/0:2H23:45:350
81620,0rcu_preempt3-21ksoftirqd/000:28:410
10050620,0irq/346-48484002467-1kworker/0:2H22:37:310
10050610,0irq/346-484840011202-1kworker/0:1H21:09:380
81600,0rcu_preempt3-21ksoftirqd/023:23:330
81600,0rcu_preempt3-21ksoftirqd/022:39:230
81590,0rcu_preempt3-21ksoftirqd/023:50:380
81590,0rcu_preempt19-21ksoftirqd/120:08:061
81580,0rcu_preempt54-21kswapd021:46:561
81580,0rcu_preempt3-21ksoftirqd/019:13:380
81580,0rcu_preempt19-21ksoftirqd/120:18:071
10050580,0irq/346-48484004635-1kworker/0:0H21:36:490
81570,0rcu_preempt32677-21kworker/u4:200:33:491
81570,0rcu_preempt3-21ksoftirqd/021:31:340
81570,0rcu_preempt3-21ksoftirqd/021:21:210
81570,0rcu_preempt3-21ksoftirqd/019:38:570
81570,0rcu_preempt20717-1kworker/0:0H19:45:450
81570,0rcu_preempt19-21ksoftirqd/119:56:511
10050570,0irq/346-484840054-21kswapd021:11:041
10050570,0irq/346-484840019761-21ssh22:51:040
10050570,0irq/346-484840019761-21ssh22:51:040
81560,0rcu_preempt54-21kswapd000:18:301
81560,0rcu_preempt54-21kswapd000:18:301
81560,0rcu_preempt19-21ksoftirqd/123:09:131
81560,0rcu_preempt19-21ksoftirqd/120:28:471
81560,0rcu_preempt19-21ksoftirqd/120:11:191
81560,0rcu_preempt19-21ksoftirqd/119:59:511
81560,0rcu_preempt19-21ksoftirqd/119:23:371
10050560,0irq/346-48484008950-1kworker/1:0H00:09:431
10050560,0irq/346-484840054-21kswapd022:58:031
10050560,0irq/346-484840054-21kswapd022:20:480
81550,0rcu_preempt54-21kswapd000:14:481
81550,0rcu_preempt19-21ksoftirqd/121:30:311
81550,0rcu_preempt19-21ksoftirqd/100:08:091
81550,0rcu_preempt16662-21diskstats23:53:361
81550,0rcu_preempt0-21swapper/100:26:481
10050550,0irq/346-484840054-21kswapd022:50:361
10050550,0irq/346-484840054-21kswapd022:50:361
10050550,0irq/346-484840054-21kswapd022:42:411
81540,0rcu_preempt54-21kswapd022:33:411
81540,0rcu_preempt19-21ksoftirqd/123:14:021
81540,0rcu_preempt19-21ksoftirqd/121:33:421
81540,0rcu_preempt19-21ksoftirqd/121:23:361
81540,0rcu_preempt19-21ksoftirqd/121:18:461
10050540,0irq/346-484840054-21kswapd023:19:330
10050540,0irq/346-484840026446-1kworker/0:3H23:35:040
10050540,0irq/346-484840011551-1kworker/0:1H00:01:050
81530,0rcu_preempt19-21ksoftirqd/120:48:361
10050530,0irq/346-484840054-21kswapd023:34:141
10050530,0irq/346-484840022317-21rm00:32:051
81520,0rcu_preempt19-21ksoftirqd/123:22:241
81520,0rcu_preempt19-21ksoftirqd/121:13:421
10050520,0irq/346-484840054-21kswapd023:49:381
10050520,0irq/346-484840054-21kswapd023:41:501
10050520,0irq/346-484840054-21kswapd022:08:350
10050520,0irq/346-484840018073-21memory21:43:440
81510,0rcu_preempt19-21ksoftirqd/123:32:581
81510,0rcu_preempt19-21ksoftirqd/122:45:391
81510,0rcu_preempt19-21ksoftirqd/122:08:331
81510,0rcu_preempt19-21ksoftirqd/121:03:391
81510,0rcu_preempt19-21ksoftirqd/121:03:391
81510,0rcu_preempt19-21ksoftirqd/120:58:401
81510,0rcu_preempt19-21ksoftirqd/120:53:361
81510,0rcu_preempt19-21ksoftirqd/120:33:391
10050510,0irq/346-4848400851-21rngd23:12:420
10050510,0irq/346-48484007955-21ssh23:44:051
10050510,0irq/346-484840054-21kswapd023:27:311
10050510,0irq/346-48484000-21swapper/022:53:320
81500,0rcu_preempt3-21ksoftirqd/019:03:370
81500,0rcu_preempt19-21ksoftirqd/122:28:341
81500,0rcu_preempt19-21ksoftirqd/122:06:111
81500,0rcu_preempt19-21ksoftirqd/121:59:181
81500,0rcu_preempt19-21ksoftirqd/120:38:431
784999501,0cyclictest11132-21ping19:33:390
10050500,0irq/346-484840054-21kswapd022:32:320
10050500,0irq/346-484840031611-1kworker/0:1H00:12:180
10050500,0irq/346-48484000-21swapper/021:54:060
81490,0rcu_preempt28781-21kworker/0:121:03:360
81490,0rcu_preempt28781-21kworker/0:121:03:360
81490,0rcu_preempt19-21ksoftirqd/123:58:391
81490,0rcu_preempt19-21ksoftirqd/122:13:361
81490,0rcu_preempt19-21ksoftirqd/121:51:011
81490,0rcu_preempt19-21ksoftirqd/121:38:211
81490,0rcu_preempt19-21ksoftirqd/121:38:211
10050490,0irq/346-484840026409-21ssh22:24:351
10050490,0irq/346-48484000-21swapper/021:24:000
81480,0rcu_preempt3-21ksoftirqd/021:17:200
81480,0rcu_preempt30789-21kworker/0:220:23:420
81480,0rcu_preempt19-21ksoftirqd/121:53:311
10050480,0irq/346-484840054-21kswapd023:40:150
81470,0rcu_preempt3-21ksoftirqd/020:08:460
81470,0rcu_preempt19-21ksoftirqd/119:48:541
81470,0rcu_preempt19-21ksoftirqd/119:38:371
10050470,0irq/346-484840021890-1kworker/0:3H22:27:570
81460,0rcu_preempt3-21ksoftirqd/020:28:360
81460,0rcu_preempt3-21ksoftirqd/020:13:390
81460,0rcu_preempt3-21ksoftirqd/020:03:430
81460,0rcu_preempt3-21ksoftirqd/019:58:430
81460,0rcu_preempt3-21ksoftirqd/019:23:590
81460,0rcu_preempt30789-21kworker/0:220:18:400
81460,0rcu_preempt19-21ksoftirqd/120:43:461
81450,0rcu_preempt3-21ksoftirqd/000:19:540
81450,0rcu_preempt3-21ksoftirqd/000:19:540
81450,0rcu_preempt19-21ksoftirqd/123:05:171
81430,0rcu_preempt3-21ksoftirqd/020:48:210
81430,0rcu_preempt29127-21kworker/0:223:04:120
81430,0rcu_preempt16039-1kworker/1:1H19:33:461
7850994320,0cyclictest27481-21ssh22:58:481
9950420,0irq/345-4848400171rcuc/122:18:501
81420,0rcu_preempt19-21ksoftirqd/119:45:561
81420,0rcu_preempt19-21ksoftirqd/119:23:201
81420,0rcu_preempt19-21ksoftirqd/119:13:441
81420,0rcu_preempt19-21ksoftirqd/119:10:521
81420,0rcu_preempt11132-21ping19:28:320
81410,0rcu_preempt5127-21apt-get20:38:300
81410,0rcu_preempt3-21ksoftirqd/020:58:460
81410,0rcu_preempt3-21ksoftirqd/019:13:030
81410,0rcu_preempt11132-21ping19:28:211
81410,0rcu_preempt10044-21apt-get20:53:310
9950400,0irq/345-484840022604-21munin-run19:53:200
81400,0rcu_preempt3-21ksoftirqd/020:33:310
81400,0rcu_preempt22754-21apt-get19:53:310
81400,0rcu_preempt19-21ksoftirqd/119:04:361
81390,0rcu_preempt3-21ksoftirqd/020:43:340
81380,0rcu_preempt11132-21ping19:18:350
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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