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2026-08-30 - 23:08

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 Sun Aug 30, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811200,0rcu_preempt3-21ksoftirqd/011:24:510
811120,0rcu_preempt19-21ksoftirqd/110:42:301
811110,0rcu_preempt3-21ksoftirqd/010:39:320
811110,0rcu_preempt19-21ksoftirqd/110:37:451
811060,0rcu_preempt11568-21kworker/0:111:18:240
811020,0rcu_preempt3-21ksoftirqd/012:30:000
81980,0rcu_preempt3-21ksoftirqd/010:54:480
81980,0rcu_preempt3-21ksoftirqd/010:54:480
81960,0rcu_preempt3-21ksoftirqd/009:42:220
81940,0rcu_preempt3-21ksoftirqd/010:04:490
81900,0rcu_preempt6516-1kworker/0:0H11:19:340
81900,0rcu_preempt19-21ksoftirqd/109:36:581
81840,0rcu_preempt24052-1kworker/1:0H09:49:551
81820,0rcu_preempt836-21rngd07:33:291
81810,0rcu_preempt19-21ksoftirqd/111:49:231
81800,0rcu_preempt19-21ksoftirqd/111:55:101
81780,0rcu_preempt19-21ksoftirqd/111:26:551
81780,0rcu_preempt19-21ksoftirqd/108:01:131
81770,0rcu_preempt54-21kswapd012:12:211
81770,0rcu_preempt3-21ksoftirqd/010:09:560
81760,0rcu_preempt19-21ksoftirqd/110:30:201
81750,0rcu_preempt3-21ksoftirqd/012:35:120
81750,0rcu_preempt19-21ksoftirqd/108:24:151
81740,0rcu_preempt19-21ksoftirqd/107:38:491
81730,0rcu_preempt3-21ksoftirqd/009:33:120
81730,0rcu_preempt19-21ksoftirqd/110:22:571
81720,0rcu_preempt3-21ksoftirqd/012:25:100
81720,0rcu_preempt3-21ksoftirqd/012:25:100
81720,0rcu_preempt19-21ksoftirqd/109:17:291
81710,0rcu_preempt3-21ksoftirqd/012:17:370
81710,0rcu_preempt3-21ksoftirqd/011:07:510
81710,0rcu_preempt19-21ksoftirqd/109:19:541
81690,0rcu_preempt3-21ksoftirqd/010:02:010
81690,0rcu_preempt19-21ksoftirqd/111:37:001
81690,0rcu_preempt19-21ksoftirqd/109:45:331
81690,0rcu_preempt19-21ksoftirqd/109:32:041
1248699692,0cyclictest28993-21runrttasks11:29:320
81680,0rcu_preempt8510-21ssh11:40:481
81680,0rcu_preempt3-21ksoftirqd/011:02:580
81680,0rcu_preempt19-21ksoftirqd/112:14:541
81680,0rcu_preempt19-21ksoftirqd/110:17:251
1248699681,0cyclictest6516-1kworker/0:0H11:13:350
81670,0rcu_preempt23870-21munin-run11:24:301
81670,0rcu_preempt19-21ksoftirqd/112:22:421
81670,0rcu_preempt19-21ksoftirqd/111:07:321
81670,0rcu_preempt19-21ksoftirqd/111:01:031
81670,0rcu_preempt19-21ksoftirqd/109:12:411
1248699671,0cyclictest9019-1kworker/0:1H10:37:200
1248699671,0cyclictest19198-1kworker/0:0H09:11:520
81660,0rcu_preempt19-21ksoftirqd/112:00:111
81660,0rcu_preempt0-21swapper/110:00:171
1248699662,0cyclictest0-21swapper/011:59:430
1248699661,0cyclictest6413-1kworker/0:1H12:12:310
81650,0rcu_preempt19-21ksoftirqd/111:12:541
81650,0rcu_preempt0-21swapper/112:27:431
81650,0rcu_preempt0-21swapper/112:27:431
1248699652,0cyclictest16763-1kworker/0:1H09:44:540
81640,0rcu_preempt54-21kswapd012:06:101
81640,0rcu_preempt3-21ksoftirqd/009:55:110
81640,0rcu_preempt19-21ksoftirqd/111:51:461
81640,0rcu_preempt19-21ksoftirqd/110:57:391
81640,0rcu_preempt19-21ksoftirqd/110:57:391
1248699644,0cyclictest31473-1kworker/0:0H10:26:170
1248699641,0cyclictest3938-1kworker/0:0H11:45:410
81630,0rcu_preempt19359-21ssh10:46:411
81630,0rcu_preempt19-21ksoftirqd/109:56:481
1248699632,0cyclictest5845-21head08:25:030
1248699623,0cyclictest0-21swapper/012:20:270
1248699622,0cyclictest2341-21meminfo11:34:510
81610,0rcu_preempt19-21ksoftirqd/110:10:561
81610,0rcu_preempt19-21ksoftirqd/109:29:101
1248699612,0cyclictest30552-21ps09:19:590
1248699611,0cyclictest6503-1kworker/0:1H11:39:570
1248699611,0cyclictest18977-1kworker/0:0H10:49:480
81600,0rcu_preempt19-21ksoftirqd/112:32:331
81600,0rcu_preempt19-21ksoftirqd/110:24:431
81600,0rcu_preempt19-21ksoftirqd/110:06:261
81600,0rcu_preempt19-21ksoftirqd/109:42:251
1248699602,0cyclictest17057-21munin-node0
1248699601,0cyclictest21501-1kworker/0:3H10:16:420
1248699601,0cyclictest15764-21ping07:39:340
1248699601,0cyclictest15764-21ping07:39:340
1248699595,0cyclictest10050irq/346-484840009:14:570
1248699593,0cyclictest3144-21cat08:19:320
1248699592,0cyclictest23878-1kworker/0:0H11:58:050
1248699592,0cyclictest1324-21snmpd08:02:440
1248699591,0cyclictest4933-1kworker/0:2H09:27:470
1248699591,0cyclictest2108-21munin-node0
1248699582,0cyclictest15764-21ping07:44:440
1248699581,0cyclictest12758-21munin-node0
81570,0rcu_preempt19-21ksoftirqd/112:36:441
1248699573,0cyclictest3-21ksoftirqd/007:19:420
1248699572,0cyclictest27196-21dropbear09:49:440
1248699571,0cyclictest4933-1kworker/0:2H09:37:170
1248699571,0cyclictest21501-1kworker/0:3H10:20:100
1248699571,0cyclictest19198-1kworker/0:0H09:09:310
1248699571,0cyclictest1441-1kworker/0:0H12:09:280
1248699571,0cyclictest13899-1kworker/0:2H11:49:370
1248699562,0cyclictest3-21ksoftirqd/007:29:440
1248699552,0cyclictest0-21swapper/008:14:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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