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2026-04-09 - 07:44

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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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 50 highest latencies:
System rackaslot5s.osadl.org (updated Thu Apr 09, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811370,0rcu_preempt3-21ksoftirqd/023:44:050
811240,0rcu_preempt3-21ksoftirqd/000:05:230
81870,0rcu_preempt16739-21ssh22:05:501
81860,0rcu_preempt19-21ksoftirqd/123:09:331
81850,0rcu_preempt19-21ksoftirqd/122:21:591
81850,0rcu_preempt19-21ksoftirqd/122:21:591
81850,0rcu_preempt19-21ksoftirqd/100:12:241
81830,0rcu_preempt54-21kswapd000:20:231
81800,0rcu_preempt3-21ksoftirqd/023:58:350
81780,0rcu_preempt19-21ksoftirqd/100:01:571
81770,0rcu_preempt19-21ksoftirqd/123:57:111
10050720,0irq/346-484840024280-1kworker/0:0H21:44:500
9950710,0irq/345-4848400171rcuc/122:24:191
81710,0rcu_preempt54-21kswapd000:13:461
10050690,0irq/346-4848400181ktimersoftd/123:03:581
81680,0rcu_preempt3-21ksoftirqd/023:36:530
81680,0rcu_preempt3-21ksoftirqd/023:36:530
81680,0rcu_preempt19-21ksoftirqd/121:28:521
81670,0rcu_preempt3-21ksoftirqd/023:40:180
81670,0rcu_preempt19-21ksoftirqd/121:57:501
10050670,0irq/346-4848400171rcuc/123:22:201
81660,0rcu_preempt23420-1kworker/0:0H23:52:150
10050660,0irq/346-4848400181ktimersoftd/121:47:221
81650,0rcu_preempt19-21ksoftirqd/100:03:581
10050650,0irq/346-484840019-21ksoftirqd/121:52:251
10050650,0irq/346-484840019-21ksoftirqd/121:52:251
10050650,0irq/346-4848400171rcuc/122:59:031
10050640,0irq/346-484840031361-21ssh22:53:550
10050640,0irq/346-484840016401-21ssh22:38:460
81630,0rcu_preempt3-21ksoftirqd/021:53:460
81630,0rcu_preempt3-21ksoftirqd/021:40:250
10050630,0irq/346-4848400171rcuc/123:38:131
10050630,0irq/346-4848400171rcuc/123:38:131
10050630,0irq/346-4848400171rcuc/122:02:041
10050620,0irq/346-4848400181ktimersoftd/121:24:381
9950610,0irq/345-484840019-21ksoftirqd/120:48:361
81610,0rcu_preempt19-21ksoftirqd/122:30:541
81610,0rcu_preempt19-21ksoftirqd/121:39:361
10050610,0irq/346-4848400171rcuc/122:49:011
10050610,0irq/346-4848400171rcuc/122:45:341
10050610,0irq/346-4848400171rcuc/122:10:501
10050610,0irq/346-4848400171rcuc/100:36:181
81600,0rcu_preempt54-21kswapd023:02:020
81600,0rcu_preempt22890-21cat00:23:551
81600,0rcu_preempt19-21ksoftirqd/122:40:251
10050600,0irq/346-484840023420-1kworker/0:0H23:58:440
10050600,0irq/346-484840023294-1kworker/0:3H00:34:240
10050600,0irq/346-4848400171rcuc/122:14:321
10050600,0irq/346-484840015509-1kworker/0:0H23:13:460
10050600,0irq/346-48484000-21swapper/000:20:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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