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2026-03-12 - 05:51

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 Thu Mar 12, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811350,0rcu_preempt19-21ksoftirqd/121:22:361
811110,0rcu_preempt3-21ksoftirqd/021:09:300
81980,0rcu_preempt19-21ksoftirqd/121:19:021
81870,0rcu_preempt20684-1kworker/1:1H00:32:421
81840,0rcu_preempt19-21ksoftirqd/121:30:411
81740,0rcu_preempt19-21ksoftirqd/123:04:171
81740,0rcu_preempt19-21ksoftirqd/121:09:041
81730,0rcu_preempt19-21ksoftirqd/123:58:161
81720,0rcu_preempt19-21ksoftirqd/120:14:151
81710,0rcu_preempt19-21ksoftirqd/119:25:151
81700,0rcu_preempt19-21ksoftirqd/119:39:131
81700,0rcu_preempt19-21ksoftirqd/119:39:131
81690,0rcu_preempt54-21kswapd022:42:351
910899681,0cyclictest27382-1kworker/0:0H22:27:530
81680,0rcu_preempt19-21ksoftirqd/123:35:211
910899662,0cyclictest22444-21ssh22:21:010
81660,0rcu_preempt11322-21apt-get20:54:111
910899652,0cyclictest12388-21ping19:24:220
81650,0rcu_preempt19-21ksoftirqd/100:19:161
910899642,0cyclictest0-21swapper/022:44:140
81640,0rcu_preempt19-21ksoftirqd/122:50:331
910899637,0cyclictest20574-1kworker/0:0H21:59:440
910899633,0cyclictest0-21swapper/023:55:080
910899633,0cyclictest0-21swapper/023:14:160
910899632,0cyclictest5862-21ssh23:09:580
910899632,0cyclictest21743-21ssh21:14:220
910899632,0cyclictest0-21swapper/021:22:590
910899631,0cyclictest27510-21dropbear20:04:170
81630,0rcu_preempt19-21ksoftirqd/122:13:351
81630,0rcu_preempt19-21ksoftirqd/100:14:271
910899623,0cyclictest24335-21head21:49:320
910899623,0cyclictest0-21swapper/021:43:580
910899622,0cyclictest11402-21grep22:09:300
910899621,0cyclictest9604-21ssh22:08:300
910899621,0cyclictest11133-21apt-get23:49:130
910899612,0cyclictest19599-21ssh22:18:470
910899612,0cyclictest10409-21ssh00:20:470
910899612,0cyclictest10239-21ssh22:41:500
910899612,0cyclictest0-21swapper/000:14:470
910899612,0cyclictest0-21swapper/000:08:490
910899602,0cyclictest0-21swapper/023:25:100
9108996012,0cyclictest9228-21ssh21:34:250
9108996012,0cyclictest9228-21ssh21:34:250
910899601,0cyclictest10050irq/346-484840023:20:010
81600,0rcu_preempt19-21ksoftirqd/122:59:301
81600,0rcu_preempt19-21ksoftirqd/120:29:041
81600,0rcu_preempt19-21ksoftirqd/119:39:031
910899598,0cyclictest0-21swapper/000:29:450
910899592,0cyclictest6398-21munin-node0
910899592,0cyclictest31332-21ssh23:36:140
910899592,0cyclictest28952-21apt-get20:09:170
910899592,0cyclictest0-21swapper/020:59:170
9108995918,0cyclictest31753-21ssh22:30:230
910899591,0cyclictest7209-21ssh23:44:310
910899591,0cyclictest5340-21ssh22:36:500
910899591,0cyclictest3981-21runrttasks23:41:240
910899591,0cyclictest31759-21apt-get23:04:130
910899591,0cyclictest17165-21diskmemload22:49:150
910899582,0cyclictest3423-21cat21:29:040
910899582,0cyclictest23314-21runrttasks22:54:410
910899582,0cyclictest0-21swapper/022:59:220
910899582,0cyclictest0-21swapper/000:37:490
910899582,0cyclictest0-21swapper/000:13:520
910899581,0cyclictest32649-1kworker/0:0H00:24:160
910899581,0cyclictest0-21swapper/021:45:340
81580,0rcu_preempt19-21ksoftirqd/122:29:261
81580,0rcu_preempt19-21ksoftirqd/121:49:291
81580,0rcu_preempt19-21ksoftirqd/121:34:251
81580,0rcu_preempt19-21ksoftirqd/121:34:251
910899572,0cyclictest0-21swapper/020:00:200
910899571,0cyclictest28630-21grep21:54:250
910899571,0cyclictest23923-21apt-get23:29:130
81570,0rcu_preempt16817-21kworker/1:221:09:131
910899562,0cyclictest28441-1kworker/0:1H21:24:230
910899562,0cyclictest28441-1kworker/0:1H21:24:230
910899562,0cyclictest22234-21munin-run19:49:020
910899562,0cyclictest20956-21apt-get23:59:120
910899562,0cyclictest20956-21apt-get23:59:120
910899562,0cyclictest16019-21df_abs19:29:180
9108995616,0cyclictest0-21swapper/020:29:130
910899561,0cyclictest22610-21awk19:49:190
910899552,0cyclictest0-21swapper/021:09:040
10050550,0irq/346-484840022487-1kworker/1:3H22:21:521
910899545,0cyclictest12388-21ping19:39:130
910899545,0cyclictest12388-21ping19:39:130
910899542,0cyclictest31173-21runrttasks20:14:290
910899542,0cyclictest12388-21ping19:19:130
910899541,0cyclictest5658-21timerwakeupswit20:34:280
910899541,0cyclictest12388-21ping19:34:260
910899533,0cyclictest0-21swapper/019:58:070
9108995312,0cyclictest0-21swapper/019:14:290
910899531,0cyclictest9428-21munin-node0
910899531,0cyclictest322-21munin-node0
81530,0rcu_preempt851-21rngd00:28:171
81530,0rcu_preempt19-21ksoftirqd/123:59:191
81530,0rcu_preempt19-21ksoftirqd/123:59:191
81530,0rcu_preempt19-21ksoftirqd/122:54:171
81530,0rcu_preempt19-21ksoftirqd/121:24:291
81530,0rcu_preempt19-21ksoftirqd/121:24:291
81530,0rcu_preempt19-21ksoftirqd/119:04:271
81530,0rcu_preempt0-21swapper/121:59:161
10050530,0irq/346-484840011692-1kworker/1:1H23:18:161
910899521,0cyclictest9685-21apt-get20:49:130
910899521,0cyclictest1463-21munin-node0
81520,0rcu_preempt19-21ksoftirqd/120:09:331
81520,0rcu_preempt0-21swapper/119:14:141
910899511,0cyclictest9559-21date20:49:030
910899511,0cyclictest12818-21idleruntime-cro20:59:020
81510,0rcu_preempt19-21ksoftirqd/122:14:221
10050500,0irq/346-484840026458-1kworker/1:0H23:31:491
81490,0rcu_preempt9107-21cyclictest20:04:311
81490,0rcu_preempt19-21ksoftirqd/123:39:121
81490,0rcu_preempt16117-21diskmemload22:34:131
9950480,0irq/345-48484000-21swapper/121:40:231
81480,0rcu_preempt16117-21diskmemload23:19:221
910899472,0cyclictest0-21swapper/019:09:030
81470,0rcu_preempt27383-1kworker/1:0H22:28:381
9950460,0irq/345-48484000-21swapper/119:45:391
81460,0rcu_preempt8301-21php-cgi20:44:191
10050460,0irq/346-4848400851-21rngd20:20:031
10050460,0irq/346-484840021915-1kworker/1:2H19:50:401
81450,0rcu_preempt19-21ksoftirqd/122:44:131
81450,0rcu_preempt19-21ksoftirqd/119:09:171
10050450,0irq/346-48484006786-1kworker/1:2H23:13:501
10050450,0irq/346-484840027517-21cron00:39:021
10050450,0irq/346-484840021915-1kworker/1:2H19:55:411
81440,0rcu_preempt19-21ksoftirqd/122:04:121
10050440,0irq/346-4848400851-21rngd23:25:411
10050440,0irq/346-484840028800-21ntpq21:54:281
81430,0rcu_preempt19-21ksoftirqd/120:24:161
81430,0rcu_preempt19-21ksoftirqd/119:59:341
81430,0rcu_preempt19-21ksoftirqd/100:04:211
10050430,0irq/346-484840054-21kswapd023:48:071
81420,0rcu_preempt19-21ksoftirqd/123:49:161
81420,0rcu_preempt19-21ksoftirqd/121:47:531
81420,0rcu_preempt19-21ksoftirqd/119:19:171
81410,0rcu_preempt19-21ksoftirqd/119:31:241
10050410,0irq/346-484840028491-1kworker/1:0H00:09:131
81400,0rcu_preempt0-21swapper/120:49:201
81390,0rcu_preempt19-21ksoftirqd/120:34:131
81380,0rcu_preempt19-21ksoftirqd/120:59:121
81380,0rcu_preempt19-21ksoftirqd/120:39:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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