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2026-05-15 - 10:56

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 Fri May 15, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81860,0rcu_preempt16581-21kworker/0:200:26:340
81850,0rcu_preempt3-21ksoftirqd/022:18:030
81850,0rcu_preempt31828-21kworker/0:222:02:580
81830,0rcu_preempt3-21ksoftirqd/020:25:270
81810,0rcu_preempt3-21ksoftirqd/023:25:490
81810,0rcu_preempt3-21ksoftirqd/020:00:340
81810,0rcu_preempt3-21ksoftirqd/000:13:230
81810,0rcu_preempt26564-21kworker/0:019:57:570
81810,0rcu_preempt15014-21kworker/0:023:28:290
81800,0rcu_preempt31828-21kworker/0:222:06:260
81790,0rcu_preempt3-21ksoftirqd/021:30:350
81790,0rcu_preempt3-21ksoftirqd/020:53:020
81790,0rcu_preempt3-21ksoftirqd/000:37:040
81790,0rcu_preempt15071-21kworker/0:122:14:520
81780,0rcu_preempt3-21ksoftirqd/023:53:010
81780,0rcu_preempt3-21ksoftirqd/022:45:210
81780,0rcu_preempt3-21ksoftirqd/021:48:310
81780,0rcu_preempt3-21ksoftirqd/021:40:140
81780,0rcu_preempt3-21ksoftirqd/021:16:090
81780,0rcu_preempt3-21ksoftirqd/020:12:580
81780,0rcu_preempt26274-21kworker/0:000:06:270
81780,0rcu_preempt0-21swapper/022:40:360
81780,0rcu_preempt0-21swapper/022:40:360
81770,0rcu_preempt31828-21kworker/0:221:53:570
81770,0rcu_preempt31828-21kworker/0:221:36:160
81760,0rcu_preempt54-21kswapd020:42:040
81760,0rcu_preempt3-21ksoftirqd/021:43:070
81760,0rcu_preempt3-21ksoftirqd/021:20:170
81760,0rcu_preempt3-21ksoftirqd/000:28:380
81760,0rcu_preempt3-21ksoftirqd/000:28:380
81760,0rcu_preempt3-21ksoftirqd/000:21:070
81750,0rcu_preempt3-21ksoftirqd/023:39:180
81750,0rcu_preempt3-21ksoftirqd/023:35:480
81750,0rcu_preempt3-21ksoftirqd/023:35:480
81750,0rcu_preempt3-21ksoftirqd/023:04:110
81750,0rcu_preempt3-21ksoftirqd/022:49:390
81750,0rcu_preempt3-21ksoftirqd/022:32:450
81750,0rcu_preempt3-21ksoftirqd/022:23:190
81750,0rcu_preempt3-21ksoftirqd/021:23:160
81750,0rcu_preempt3-21ksoftirqd/021:08:360
81750,0rcu_preempt3-21ksoftirqd/020:03:260
81750,0rcu_preempt11119-21processes19:08:260
81740,0rcu_preempt3-21ksoftirqd/023:58:400
81740,0rcu_preempt3-21ksoftirqd/023:53:260
81740,0rcu_preempt3-21ksoftirqd/023:13:410
81740,0rcu_preempt3-21ksoftirqd/023:10:510
81740,0rcu_preempt3-21ksoftirqd/022:33:040
81740,0rcu_preempt3-21ksoftirqd/021:07:370
81740,0rcu_preempt3-21ksoftirqd/020:33:030
81740,0rcu_preempt3-21ksoftirqd/020:29:040
81740,0rcu_preempt3-21ksoftirqd/019:46:500
81740,0rcu_preempt3-21ksoftirqd/000:12:210
81740,0rcu_preempt23524-21kworker/0:223:43:150
81740,0rcu_preempt17217-21diskmemload22:55:470
81740,0rcu_preempt17217-21diskmemload22:08:040
81730,0rcu_preempt3-21ksoftirqd/023:21:420
81730,0rcu_preempt3-21ksoftirqd/023:00:500
81730,0rcu_preempt3-21ksoftirqd/020:52:060
81730,0rcu_preempt3-21ksoftirqd/020:46:330
81730,0rcu_preempt3-21ksoftirqd/020:18:220
81730,0rcu_preempt3-21ksoftirqd/019:52:490
81730,0rcu_preempt3-21ksoftirqd/019:16:000
81720,0rcu_preempt3-21ksoftirqd/019:28:160
81720,0rcu_preempt14086-21apt-get20:58:130
81710,0rcu_preempt3-21ksoftirqd/020:17:290
81710,0rcu_preempt3-21ksoftirqd/019:28:020
81680,0rcu_preempt14768-21kworker/0:219:39:190
81650,0rcu_preempt3-21ksoftirqd/019:18:270
81630,0rcu_preempt3-21ksoftirqd/019:33:300
81630,0rcu_preempt3-21ksoftirqd/019:08:020
10050560,0irq/346-4848400177742sleep122:13:381
81550,0rcu_preempt19-21ksoftirqd/119:23:141
9950540,0irq/345-484840081rcu_preempt22:27:421
10050520,0irq/346-484840011565-1kworker/1:1H21:37:551
10050500,0irq/346-484840030340-21ssh00:05:461
10050500,0irq/346-48484001741-1kworker/1:2H21:27:281
10050500,0irq/346-484840011688-21cpu22:08:151
10050490,0irq/346-484840023145-1taskset21:13:271
10050490,0irq/346-484840021919-1kworker/1:1H00:32:391
10050490,0irq/346-484840021919-1kworker/1:1H00:32:391
10050480,0irq/346-484840054-21kswapd023:22:321
10050480,0irq/346-484840054-21kswapd023:12:201
10050480,0irq/346-484840054-21kswapd021:19:281
10050470,0irq/346-484840054-21kswapd023:14:041
81460,0rcu_preempt851-21rngd22:48:021
10050460,0irq/346-484840010209-21cyclictest21:53:251
10050450,0irq/346-484840019848-1kworker/1:0H23:57:431
10050450,0irq/346-484840019116-21idleruntime-cro21:43:011
10050440,0irq/346-484840081rcu_preempt23:28:161
10050440,0irq/346-484840031613-21ssh23:01:161
10050440,0irq/346-48484000-21swapper/123:25:191
81430,0rcu_preempt0-21swapper/121:28:311
10050430,0irq/346-484840026434-21ping20:18:191
10050420,0irq/346-484840013665-21ssh00:22:031
10050420,0irq/346-484840013152-21munin-node1
10050420,0irq/346-484840010742-1kworker/1:0H22:44:381
10050420,0irq/346-48484000-21swapper/123:38:271
9950410,0irq/345-484840021365-1kworker/1:3H22:04:081
81410,0rcu_preempt17217-21diskmemload21:58:131
10050410,0irq/346-484840018247-21missed_timers21:08:261
10050400,0irq/346-48484007974-21ssh23:43:161
10050400,0irq/346-48484005800-1kworker/1:1H22:35:461
10050400,0irq/346-484840022762-21ssh21:46:241
10050400,0irq/346-484840021358-21ssh22:18:111
10050400,0irq/346-484840013221-21ssh22:43:021
10050400,0irq/346-484840013221-21ssh22:43:021
10050400,0irq/346-48484001-21init00:00:041
10050400,0irq/346-48484000-21swapper/100:26:211
81390,0rcu_preempt19-21ksoftirqd/119:03:171
10050390,0irq/346-48484004032-21ssh23:06:091
10050390,0irq/346-484840030906-21if_eth323:33:231
10050390,0irq/346-484840030906-21if_eth323:33:231
10050390,0irq/346-484840021365-1kworker/1:3H21:48:301
10050390,0irq/346-48484001847-21ssh00:09:271
10050390,0irq/346-484840013562-21taskset20:54:241
10050390,0irq/346-484840010383-1kworker/1:2H20:48:161
10050390,0irq/346-48484000-21swapper/100:13:491
10050380,0irq/346-484840031456-21ssh22:28:181
10050380,0irq/346-484840028598-21ssh00:37:191
10050380,0irq/346-484840023859-21if_eth122:53:221
10050370,0irq/346-484840019-21ksoftirqd/120:23:121
10050360,0irq/346-48484000-21swapper/119:18:311
81350,0rcu_preempt19-21ksoftirqd/120:13:321
103502350,0sleep14968-1kworker/1:0H19:08:111
10050350,0irq/346-48484000-21swapper/119:45:021
81340,0rcu_preempt19-21ksoftirqd/119:33:191
10050340,0irq/346-484840026434-21ping19:58:131
10050340,0irq/346-48484000-21swapper/121:00:321
10050340,0irq/346-48484000-21swapper/120:08:141
10050330,0irq/346-484840019-21ksoftirqd/120:03:321
10050330,0irq/346-48484000-21swapper/120:43:021
81320,0rcu_preempt19-21ksoftirqd/119:38:331
1699320,0migration/16094-21munin-node1
13250320,0irq/301-480200054-21kswapd019:53:171
10050320,0irq/346-48484000-21swapper/120:43:131
1699310,0migration/116644-21timerwakeupswit21:03:281
1021199302,0cyclictest0-21swapper/119:50:341
10050300,0irq/346-48484000-21swapper/119:30:131
10050290,0irq/346-48484001067-21lighttpd19:14:581
10050280,0irq/346-48484000-21swapper/120:28:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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