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2026-07-08 - 12:47

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 Jul 08, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811250,0rcu_preempt3-21ksoftirqd/021:47:300
811070,0rcu_preempt19-21ksoftirqd/123:47:331
811030,0rcu_preempt851-21rngd22:20:490
81930,0rcu_preempt19-21ksoftirqd/122:24:401
81920,0rcu_preempt19-21ksoftirqd/123:07:091
81920,0rcu_preempt19-21ksoftirqd/121:22:581
81870,0rcu_preempt19-21ksoftirqd/121:47:311
10050810,0irq/346-4848400111rcuc/021:18:270
10050800,0irq/346-484840041ktimersoftd/023:36:150
9950770,0irq/345-4848400111rcuc/000:22:240
10050770,0irq/346-4848400111rcuc/022:31:340
10050770,0irq/346-4848400111rcuc/022:31:340
10050770,0irq/346-4848400111rcuc/021:07:380
9950760,0irq/345-4848400111rcuc/023:45:230
9950760,0irq/345-4848400111rcuc/023:09:080
81760,0rcu_preempt54-21kswapd023:16:191
9950750,0irq/345-4848400111rcuc/021:28:030
9950750,0irq/345-4848400111rcuc/000:04:030
10050750,0irq/346-4848400111rcuc/019:42:390
9950740,0irq/345-4848400111rcuc/022:08:490
81740,0rcu_preempt0-21swapper/121:14:051
81740,0rcu_preempt0-21swapper/100:26:091
10050740,0irq/346-4848400111rcuc/023:25:400
81730,0rcu_preempt3-21ksoftirqd/020:52:400
81730,0rcu_preempt19-21ksoftirqd/123:32:211
9950720,0irq/345-4848400111rcuc/022:54:380
81720,0rcu_preempt3-21ksoftirqd/023:54:110
2748099722,0cyclictest0-21swapper/023:47:430
9950710,0irq/345-4848400111rcuc/023:59:190
2748099715,0cyclictest0-21swapper/022:48:210
9950700,0irq/345-484840041ktimersoftd/022:59:240
10050700,0irq/346-484840041ktimersoftd/021:40:380
10050700,0irq/346-484840041ktimersoftd/000:10:040
81690,0rcu_preempt0-21swapper/100:07:171
2748099692,0cyclictest1635-21ls19:27:090
27480996917,0cyclictest0-21swapper/023:37:260
9950680,0irq/345-484840041ktimersoftd/022:06:430
81680,0rcu_preempt19-21ksoftirqd/100:03:281
2748099684,0cyclictest31877-1kworker/0:1H00:22:020
2748099681,0cyclictest7027-21cron22:17:080
2748099681,0cyclictest26793-1kworker/0:1H23:12:310
81670,0rcu_preempt3-21ksoftirqd/023:03:310
81670,0rcu_preempt19-21ksoftirqd/122:38:131
81670,0rcu_preempt19-21ksoftirqd/119:34:081
2748099673,0cyclictest12241-21apt-get23:27:170
9950660,0irq/345-484840041ktimersoftd/021:27:060
2748099661,0cyclictest0-21swapper/022:35:400
9950650,0irq/345-484840041ktimersoftd/021:44:200
2748099651,0cyclictest12733-21munin-node0
10050650,0irq/346-484840041ktimersoftd/000:17:060
9950640,0irq/345-4848400111rcuc/022:26:140
2748099642,0cyclictest662-21munin-node0
81630,0rcu_preempt19-21ksoftirqd/123:56:481
81620,0rcu_preempt11614-21kworker/0:221:32:360
2748099622,0cyclictest16393-21latency_hist20:12:100
2748099622,0cyclictest0-21swapper/019:27:190
81610,0rcu_preempt19-21ksoftirqd/121:30:261
81610,0rcu_preempt19-21ksoftirqd/100:01:321
2748099612,0cyclictest31524-21dropbear20:57:220
2748099611,0cyclictest23283-21dropbear20:32:220
2748099611,0cyclictest0-21swapper/021:12:210
81600,0rcu_preempt19-21ksoftirqd/122:34:131
10050600,0irq/346-4848400111rcuc/021:02:280
2748099595,0cyclictest0-21swapper/019:35:360
2748099592,0cyclictest0-21swapper/019:57:240
2748099592,0cyclictest0-21swapper/019:20:360
2748099591,0cyclictest27779-21ssh22:37:290
10050590,0irq/346-484840054-21kswapd023:17:200
2748099582,0cyclictest27899-21idleruntime-cro20:47:080
2748099582,0cyclictest22639-21ssh21:59:450
2748099581,0cyclictest9727-21ssh00:29:170
2748099572,0cyclictest0-21swapper/019:12:260
2748099572,0cyclictest0-21swapper/019:12:260
2748099571,0cyclictest14791-21ssh21:52:200
81560,0rcu_preempt19348-1kworker/1:2H23:42:291
2748099562,0cyclictest30758-21ping19:37:200
2748099562,0cyclictest0-21swapper/020:47:320
2748099562,0cyclictest0-21swapper/020:08:590
2748099561,0cyclictest19831-21apt-get20:22:180
81550,0rcu_preempt19-21ksoftirqd/122:07:151
81550,0rcu_preempt19-21ksoftirqd/121:37:231
2748099552,0cyclictest0-21swapper/019:57:100
2748099552,0cyclictest0-21swapper/019:47:310
81540,0rcu_preempt30758-21ping19:37:231
81540,0rcu_preempt19-21ksoftirqd/120:37:251
81540,0rcu_preempt19-21ksoftirqd/120:17:201
2748099542,0cyclictest0-21swapper/019:07:340
81530,0rcu_preempt19-21ksoftirqd/100:21:571
2748099532,0cyclictest0-21swapper/020:28:480
2748099532,0cyclictest0-21swapper/020:02:330
81520,0rcu_preempt19-21ksoftirqd/122:50:581
81520,0rcu_preempt19-21ksoftirqd/122:31:281
81520,0rcu_preempt19-21ksoftirqd/122:31:281
81520,0rcu_preempt19-21ksoftirqd/120:09:471
2748099529,0cyclictest27479-21cyclictest19:07:090
2748099522,0cyclictest0-21swapper/020:42:090
2748099522,0cyclictest0-21swapper/020:18:470
81510,0rcu_preempt19-21ksoftirqd/121:53:481
81510,0rcu_preempt19-21ksoftirqd/120:23:441
81500,0rcu_preempt19-21ksoftirqd/122:57:311
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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