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2026-04-29 - 17:31

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 792 highest latencies:
System rackaslot5s.osadl.org (updated Wed Apr 29, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811520,0rcu_preempt3-21ksoftirqd/009:19:210
81940,0rcu_preempt0-21swapper/110:06:291
81920,0rcu_preempt0-21swapper/111:57:191
81840,0rcu_preempt19-21ksoftirqd/112:18:351
81810,0rcu_preempt19-21ksoftirqd/109:39:591
81810,0rcu_preempt19-21ksoftirqd/109:18:331
10050800,0irq/346-4848400171rcuc/110:30:171
81790,0rcu_preempt19-21ksoftirqd/110:34:261
10050770,0irq/346-4848400171rcuc/109:18:161
81760,0rcu_preempt54-21kswapd009:44:201
9950740,0irq/345-4848400171rcuc/111:15:131
81740,0rcu_preempt19-21ksoftirqd/109:36:431
81730,0rcu_preempt19-21ksoftirqd/112:17:021
81720,0rcu_preempt31110-21kworker/1:209:58:351
81720,0rcu_preempt2211-21ssh12:24:521
81720,0rcu_preempt19-21ksoftirqd/111:34:211
81720,0rcu_preempt19-21ksoftirqd/111:05:231
81710,0rcu_preempt54-21kswapd010:18:440
81710,0rcu_preempt19-21ksoftirqd/112:02:371
81710,0rcu_preempt19-21ksoftirqd/108:24:491
81710,0rcu_preempt1918-21diskmemload11:03:110
81710,0rcu_preempt12578-21ssh10:57:161
81700,0rcu_preempt54-21kswapd012:25:270
81700,0rcu_preempt19-21ksoftirqd/112:36:251
81700,0rcu_preempt19-21ksoftirqd/111:49:461
81690,0rcu_preempt19-21ksoftirqd/109:28:011
81680,0rcu_preempt26408-21ssh11:11:021
81680,0rcu_preempt19-21ksoftirqd/110:51:421
81680,0rcu_preempt19-21ksoftirqd/109:50:141
228552680,0chrt9950irq/345-484840012:13:300
81670,0rcu_preempt54-21kswapd012:12:041
81670,0rcu_preempt19-21ksoftirqd/112:32:501
81660,0rcu_preempt3-21ksoftirqd/010:43:440
81660,0rcu_preempt26527-21grep11:43:441
81660,0rcu_preempt19-21ksoftirqd/109:56:181
81650,0rcu_preempt54-21kswapd010:24:271
81650,0rcu_preempt3-21ksoftirqd/009:36:280
81650,0rcu_preempt19-21ksoftirqd/110:45:181
81650,0rcu_preempt19-21ksoftirqd/109:32:051
81640,0rcu_preempt19-21ksoftirqd/108:13:411
81630,0rcu_preempt3-21ksoftirqd/010:48:340
81620,0rcu_preempt54-21kswapd010:06:460
81620,0rcu_preempt3-21ksoftirqd/009:10:550
81620,0rcu_preempt19-21ksoftirqd/111:25:291
81620,0rcu_preempt19-21ksoftirqd/108:08:421
81620,0rcu_preempt19-21ksoftirqd/107:08:391
10050620,0irq/346-4848400171rcuc/110:09:581
81610,0rcu_preempt54-21kswapd009:12:121
81610,0rcu_preempt3-21ksoftirqd/011:53:310
81610,0rcu_preempt3-21ksoftirqd/011:38:170
81610,0rcu_preempt3-21ksoftirqd/011:08:430
81610,0rcu_preempt19-21ksoftirqd/111:19:021
81610,0rcu_preempt19-21ksoftirqd/107:13:271
81610,0rcu_preempt14092-21users12:03:451
81600,0rcu_preempt3-21ksoftirqd/010:29:430
81600,0rcu_preempt19-21ksoftirqd/110:39:011
81600,0rcu_preempt19-21ksoftirqd/108:44:271
81600,0rcu_preempt19-21ksoftirqd/107:48:261
81590,0rcu_preempt3-21ksoftirqd/011:48:210
81590,0rcu_preempt3-21ksoftirqd/011:25:310
81590,0rcu_preempt3-21ksoftirqd/007:13:360
81580,0rcu_preempt54-21kswapd011:43:011
81580,0rcu_preempt19-21ksoftirqd/108:48:281
81580,0rcu_preempt19-21ksoftirqd/108:31:411
81570,0rcu_preempt31206-21apt-get08:58:271
81560,0rcu_preempt3-21ksoftirqd/009:58:420
81560,0rcu_preempt19-21ksoftirqd/108:22:131
81560,0rcu_preempt19-21ksoftirqd/108:04:141
81560,0rcu_preempt19-21ksoftirqd/107:58:521
9950550,0irq/345-484840054-21kswapd009:27:020
81550,0rcu_preempt3-21ksoftirqd/012:28:400
81550,0rcu_preempt19-21ksoftirqd/110:18:321
81550,0rcu_preempt19-21ksoftirqd/110:13:401
81550,0rcu_preempt19-21ksoftirqd/107:57:011
10050550,0irq/346-484840054-21kswapd011:30:501
10050550,0irq/346-484840021961-21ssh11:06:400
81540,0rcu_preempt19-21ksoftirqd/108:33:331
10050540,0irq/346-484840024523-21ssh09:30:300
81530,0rcu_preempt3-21ksoftirqd/010:39:170
81530,0rcu_preempt3-21ksoftirqd/008:03:290
81530,0rcu_preempt30122-21meminfo08:53:391
10050530,0irq/346-484840054-21kswapd011:13:390
10050530,0irq/346-484840032454-1kworker/0:1H11:59:180
81520,0rcu_preempt19-21ksoftirqd/108:38:351
10050520,0irq/346-484840014493-1kworker/0:2H12:05:000
10050520,0irq/346-48484000-21swapper/010:36:100
81510,0rcu_preempt19-21ksoftirqd/109:03:411
81510,0rcu_preempt19-21ksoftirqd/107:33:421
81500,0rcu_preempt3-21ksoftirqd/011:46:020
10050500,0irq/346-484840054-21kswapd010:17:210
10050500,0irq/346-484840027309-1kworker/0:2H12:19:070
81490,0rcu_preempt3-21ksoftirqd/009:14:350
81490,0rcu_preempt19-21ksoftirqd/107:24:361
81490,0rcu_preempt11154-21ping08:18:410
10050490,0irq/346-484840054-21kswapd007:58:400
10050490,0irq/346-48484003-21ksoftirqd/007:23:320
10050490,0irq/346-484840031521-1kworker/0:1H10:53:510
10050490,0irq/346-484840011248-1kworker/0:1H10:23:200
10050490,0irq/346-48484000-21swapper/010:12:140
81480,0rcu_preempt3-21ksoftirqd/009:08:170
81480,0rcu_preempt19-21ksoftirqd/111:00:381
81480,0rcu_preempt19-21ksoftirqd/107:46:471
10050480,0irq/346-484840011049-21ssh11:28:330
81470,0rcu_preempt851-21rngd07:28:461
81470,0rcu_preempt3-21ksoftirqd/008:23:430
81470,0rcu_preempt3-21ksoftirqd/008:18:170
10050470,0irq/346-484840014164-21ssh09:53:230
10050470,0irq/346-48484000-21swapper/008:43:160
9950460,0irq/345-484840017727-21munin-node0
81460,0rcu_preempt3-21ksoftirqd/007:58:170
81460,0rcu_preempt3-21ksoftirqd/007:03:360
10050460,0irq/346-48484008258-21ssh09:47:160
81450,0rcu_preempt19-21ksoftirqd/107:19:201
81440,0rcu_preempt3-21ksoftirqd/012:37:190
81440,0rcu_preempt3-21ksoftirqd/008:33:260
81440,0rcu_preempt19-21ksoftirqd/107:39:071
10050440,0irq/346-48484001918-21diskmemload09:48:390
10050440,0irq/346-484840017603-1kworker/0:0H11:42:080
81430,0rcu_preempt3-21ksoftirqd/011:18:260
81430,0rcu_preempt3-21ksoftirqd/009:38:420
81430,0rcu_preempt3-21ksoftirqd/008:49:210
81430,0rcu_preempt3-21ksoftirqd/008:32:250
81430,0rcu_preempt30626-21ping07:43:380
10050430,0irq/346-484840030739-1kworker/0:1H08:58:340
81420,0rcu_preempt3-21ksoftirqd/008:53:250
81420,0rcu_preempt3-21ksoftirqd/008:08:460
81410,0rcu_preempt3-21ksoftirqd/007:50:360
2734499413,0cyclictest0-21swapper/007:38:280
27344994114,0cyclictest0-21swapper/007:33:250
10050410,0irq/346-484840026106-1kworker/0:0H08:43:300
81400,0rcu_preempt3-21ksoftirqd/007:11:080
81400,0rcu_preempt31060-21php-cgi07:18:370
81380,0rcu_preempt19-21ksoftirqd/107:05:351
2734499382,0cyclictest30626-21ping07:28:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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