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2026-06-20 - 00:14

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Fri Jun 19, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811000,0rcu_preempt3-21ksoftirqd/011:14:080
81930,0rcu_preempt3-21ksoftirqd/009:50:460
81900,0rcu_preempt19-21ksoftirqd/112:32:291
81900,0rcu_preempt19-21ksoftirqd/109:32:521
81900,0rcu_preempt19-21ksoftirqd/109:32:521
10050790,0irq/346-4848400111rcuc/009:42:540
10050770,0irq/346-4848400111rcuc/010:09:470
81750,0rcu_preempt3-21ksoftirqd/011:12:080
81720,0rcu_preempt3-21ksoftirqd/010:02:000
81710,0rcu_preempt3-21ksoftirqd/012:09:120
81690,0rcu_preempt3-21ksoftirqd/011:17:550
81690,0rcu_preempt19-21ksoftirqd/109:55:391
81690,0rcu_preempt18906-1kworker/0:2H08:22:270
26968996912,0cyclictest47472chrt12:27:430
81660,0rcu_preempt3-21ksoftirqd/009:20:280
81660,0rcu_preempt19-21ksoftirqd/109:12:371
81650,0rcu_preempt19-21ksoftirqd/110:12:471
81650,0rcu_preempt16855-21dropbear09:22:400
10050650,0irq/346-484840054-21kswapd011:32:391
81640,0rcu_preempt3-21ksoftirqd/012:24:410
81640,0rcu_preempt28576-21cat10:07:281
2696899645,0cyclictest1835-1kworker/0:2H09:40:290
2696899642,0cyclictest0-21swapper/011:50:590
2696899642,0cyclictest0-21swapper/010:51:510
10050640,0irq/346-484840015937-1kworker/1:0H10:01:531
81630,0rcu_preempt19-21ksoftirqd/109:47:451
10050630,0irq/346-484840041ktimersoftd/011:28:090
81620,0rcu_preempt3-21ksoftirqd/012:33:480
2696899622,0cyclictest13062-21munin-node0
2696899622,0cyclictest0-21swapper/009:12:390
26968996216,0cyclictest22538-21ssh12:12:450
10050620,0irq/346-484840029407-1kworker/1:0H12:21:331
10050620,0irq/346-48484001895-1kworker/1:1H12:26:141
81610,0rcu_preempt3-21ksoftirqd/011:52:380
81610,0rcu_preempt13350-1kworker/0:0H10:26:510
2696899612,0cyclictest0-21swapper/012:21:330
2696899612,0cyclictest0-21swapper/011:43:130
2696899612,0cyclictest0-21swapper/010:04:160
10050610,0irq/346-48484007986-1kworker/1:3H11:27:201
10050610,0irq/346-48484005819-1kworker/1:1H10:52:241
10050610,0irq/346-48484004917-1kworker/1:0H11:55:591
10050610,0irq/346-484840023302-1kworker/1:2H10:38:561
81600,0rcu_preempt3-21ksoftirqd/010:27:510
81600,0rcu_preempt30253-21ping07:37:281
2696899602,0cyclictest31344-21latency_hist09:37:280
2696899602,0cyclictest21339-21if_err_eth208:27:490
2696899602,0cyclictest16906-21ssh09:55:130
2696899601,0cyclictest7569-21users10:17:580
10050600,0irq/346-484840014715-1kworker/1:3H12:04:591
81590,0rcu_preempt3-21ksoftirqd/010:57:370
81590,0rcu_preempt3-21ksoftirqd/007:40:580
81590,0rcu_preempt30253-21ping07:27:590
81590,0rcu_preempt19-21ksoftirqd/111:02:361
2696899599,0cyclictest0-21swapper/007:42:500
2696899593,0cyclictest0-21swapper/011:24:490
2696899592,0cyclictest30253-21ping07:17:400
2696899592,0cyclictest27308-21munin-node0
2696899592,0cyclictest21912-21meminfo10:32:490
26968995915,0cyclictest10050irq/346-484840011:33:210
10050590,0irq/346-48484009831-1kworker/1:1H12:00:271
81580,0rcu_preempt3-21ksoftirqd/008:17:160
81580,0rcu_preempt19-21ksoftirqd/110:11:481
81580,0rcu_preempt19-21ksoftirqd/109:18:401
2696899585,0cyclictest6008-21ssh10:17:260
10050580,0irq/346-484840054-21kswapd010:19:041
10050580,0irq/346-484840029262-1kworker/1:2H09:38:121
81570,0rcu_preempt1470-21runrttasks09:07:460
2696899577,0cyclictest0-21swapper/010:46:440
2696899572,0cyclictest30253-21ping07:32:390
2696899572,0cyclictest0-21swapper/010:39:030
10050570,0irq/346-484840054-21kswapd011:32:021
10050570,0irq/346-484840032430-1kworker/1:3H11:51:201
10050570,0irq/346-484840017765-21ssh10:28:171
81560,0rcu_preempt3-21ksoftirqd/007:07:510
81560,0rcu_preempt19-21ksoftirqd/111:38:091
2696899562,0cyclictest30253-21ping07:22:360
26968995614,0cyclictest0-21swapper/010:52:530
26968995611,0cyclictest0-21swapper/011:04:050
10050560,0irq/346-4848400851-21rngd11:12:421
10050560,0irq/346-484840024302-1kworker/1:1H09:31:371
10050560,0irq/346-484840023302-1kworker/1:2H10:34:071
81550,0rcu_preempt3-21ksoftirqd/008:52:530
81550,0rcu_preempt19-21ksoftirqd/110:59:311
81550,0rcu_preempt19-21ksoftirqd/109:22:431
2696899553,0cyclictest0-21swapper/007:57:570
2696899552,0cyclictest28760-1kworker/0:1H08:52:270
2696899552,0cyclictest0-21swapper/011:42:020
10050550,0irq/346-48484008362-1kworker/1:3H10:23:191
10050540,0irq/346-48484006772-1kworker/1:3H12:30:031
10050540,0irq/346-48484004506-1kworker/1:2H09:11:591
10050540,0irq/346-48484003103-1kworker/1:2H11:21:251
10050540,0irq/346-484840019590-1kworker/1:0H12:13:091
81530,0rcu_preempt3-21ksoftirqd/008:32:440
81530,0rcu_preempt0-21swapper/108:12:451
26968995313,0cyclictest23067-21rm09:28:130
2696899531,0cyclictest31037-21df_inode08:57:440
2696899531,0cyclictest10050irq/346-484840011:59:520
10050530,0irq/346-484840020751-1kworker/1:1H11:08:161
81520,0rcu_preempt3-21ksoftirqd/007:47:470
81520,0rcu_preempt24521-21php-cgi08:37:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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