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2026-09-10 - 02:21

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 Wed Sep 09, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811540,0rcu_preempt28569-21ping08:14:471
811540,0rcu_preempt28569-21ping08:14:471
811010,0rcu_preempt19-21ksoftirqd/110:24:221
811010,0rcu_preempt19-21ksoftirqd/109:33:211
81940,0rcu_preempt19-21ksoftirqd/112:29:421
81930,0rcu_preempt19-21ksoftirqd/112:27:471
81880,0rcu_preempt19-21ksoftirqd/108:09:501
81870,0rcu_preempt19-21ksoftirqd/108:04:331
81850,0rcu_preempt19-21ksoftirqd/110:08:421
81830,0rcu_preempt19-21ksoftirqd/111:44:491
81820,0rcu_preempt19-21ksoftirqd/110:19:261
81800,0rcu_preempt23329-21diskmemload09:44:521
81800,0rcu_preempt19-21ksoftirqd/109:14:401
81790,0rcu_preempt19-21ksoftirqd/110:39:431
81760,0rcu_preempt19-21ksoftirqd/107:29:361
81750,0rcu_preempt19-21ksoftirqd/112:01:111
81750,0rcu_preempt19-21ksoftirqd/108:19:331
81740,0rcu_preempt19-21ksoftirqd/111:04:301
10050740,0irq/346-484840054-21kswapd012:25:220
81730,0rcu_preempt19-21ksoftirqd/110:59:431
81710,0rcu_preempt19-21ksoftirqd/110:29:391
81710,0rcu_preempt19-21ksoftirqd/108:29:311
81710,0rcu_preempt0-21swapper/111:36:141
81700,0rcu_preempt19-21ksoftirqd/112:34:391
81700,0rcu_preempt19-21ksoftirqd/112:34:391
81700,0rcu_preempt19-21ksoftirqd/111:54:451
81700,0rcu_preempt19-21ksoftirqd/111:54:451
81690,0rcu_preempt9950irq/345-484840011:22:530
81690,0rcu_preempt19-21ksoftirqd/111:13:171
81690,0rcu_preempt19-21ksoftirqd/110:53:421
81690,0rcu_preempt19-21ksoftirqd/109:54:151
81690,0rcu_preempt19-21ksoftirqd/107:59:241
81680,0rcu_preempt19-21ksoftirqd/110:55:351
81680,0rcu_preempt19-21ksoftirqd/109:39:041
81680,0rcu_preempt19-21ksoftirqd/109:11:361
10050680,0irq/346-48484009374-1kworker/0:3H09:34:070
81670,0rcu_preempt19-21ksoftirqd/112:12:491
81670,0rcu_preempt19-21ksoftirqd/112:08:021
81670,0rcu_preempt19-21ksoftirqd/111:29:351
81670,0rcu_preempt19-21ksoftirqd/110:09:311
81670,0rcu_preempt19-21ksoftirqd/110:04:171
81670,0rcu_preempt19-21ksoftirqd/109:20:281
81670,0rcu_preempt19-21ksoftirqd/109:20:281
81670,0rcu_preempt19-21ksoftirqd/108:49:211
81660,0rcu_preempt19-21ksoftirqd/111:29:071
81660,0rcu_preempt19-21ksoftirqd/111:15:321
81640,0rcu_preempt19-21ksoftirqd/111:43:271
81640,0rcu_preempt19-21ksoftirqd/107:25:391
81640,0rcu_preempt19-21ksoftirqd/107:20:481
81630,0rcu_preempt19-21ksoftirqd/110:37:231
81630,0rcu_preempt15379-1kworker/0:0H07:19:230
81620,0rcu_preempt19-21ksoftirqd/112:20:041
81610,0rcu_preempt54-21kswapd010:47:150
81610,0rcu_preempt21941-1kworker/0:2H10:17:100
81610,0rcu_preempt19340-21diskmemload09:39:361
81600,0rcu_preempt15404-21ntpq12:19:470
81590,0rcu_preempt19-21ksoftirqd/107:54:311
81590,0rcu_preempt19-21ksoftirqd/107:54:311
81590,0rcu_preempt19-21ksoftirqd/107:49:481
81580,0rcu_preempt19-21ksoftirqd/110:14:341
81580,0rcu_preempt19-21ksoftirqd/108:44:341
81580,0rcu_preempt10853-21apt-get07:04:311
81550,0rcu_preempt19-21ksoftirqd/112:15:551
81550,0rcu_preempt19-21ksoftirqd/107:39:351
10050550,0irq/346-484840029496-1kworker/0:0H10:59:220
81540,0rcu_preempt19-21ksoftirqd/111:50:571
81530,0rcu_preempt19-21ksoftirqd/110:44:471
10050530,0irq/346-4848400294712sleep009:19:240
10050530,0irq/346-4848400294712sleep009:19:240
10050530,0irq/346-484840014545-1kworker/0:1H10:49:340
9950520,0irq/345-4848400836-21rngd09:28:531
10050520,0irq/346-484840054-21kswapd010:03:380
81510,0rcu_preempt9131-21kworker/0:107:04:320
10050510,0irq/346-4848400836-21rngd09:45:590
10050510,0irq/346-484840032178-21aten_rapower_vo10:59:330
10050500,0irq/346-484840012199-1kworker/0:2H12:17:550
81490,0rcu_preempt3-21ksoftirqd/012:07:020
81490,0rcu_preempt3-21ksoftirqd/009:39:340
81490,0rcu_preempt19-21ksoftirqd/107:09:341
10050490,0irq/346-4848400836-21rngd10:34:590
10050490,0irq/346-484840054-21kswapd009:56:321
81480,0rcu_preempt3-21ksoftirqd/010:29:350
81480,0rcu_preempt19-21ksoftirqd/109:04:391
81480,0rcu_preempt19-21ksoftirqd/108:59:411
1235899481,0cyclictest2754-1kworker/0:0H09:25:380
81470,0rcu_preempt3-21ksoftirqd/011:55:460
81470,0rcu_preempt3-21ksoftirqd/011:55:460
81470,0rcu_preempt3-21ksoftirqd/011:44:440
81470,0rcu_preempt3-21ksoftirqd/011:04:410
1235899471,0cyclictest22179-1kworker/0:0H12:39:210
1235899471,0cyclictest22179-1kworker/0:0H12:39:210
10050470,0irq/346-484840054-21kswapd010:09:210
81460,0rcu_preempt54-21kswapd012:31:510
81460,0rcu_preempt3-21ksoftirqd/009:54:410
81460,0rcu_preempt1123-21kworker/0:110:09:440
12358994611,0cyclictest1445-21runrttasks11:36:360
10050460,0irq/346-484840054-21kswapd007:39:420
81450,0rcu_preempt3-21ksoftirqd/012:10:460
81450,0rcu_preempt3-21ksoftirqd/012:01:320
81450,0rcu_preempt3-21ksoftirqd/011:41:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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