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2025-07-01 - 08:11

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 20 highest latencies:
System rackaslot5s.osadl.org (updated Tue Jul 01, 2025 00:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81890,0rcu_preempt23904-21kworker/0:023:06:540
81790,0rcu_preempt19776-21ping19:27:300
81650,0rcu_preempt19-21ksoftirqd/123:37:321
81610,0rcu_preempt54-21kswapd021:53:440
81600,0rcu_preempt26374-21php-cgi21:09:491
81600,0rcu_preempt19-21ksoftirqd/123:42:161
81580,0rcu_preempt3-21ksoftirqd/019:32:200
81570,0rcu_preempt19-21ksoftirqd/122:53:561
81560,0rcu_preempt3-21ksoftirqd/022:07:070
81550,0rcu_preempt19-21ksoftirqd/123:06:541
81550,0rcu_preempt19-21ksoftirqd/122:18:581
9950540,0irq/345-4848400181ktimersoftd/121:57:101
81540,0rcu_preempt19-21ksoftirqd/119:51:541
81540,0rcu_preempt19-21ksoftirqd/119:47:051
10050540,0irq/346-48484001397-1kworker/0:2H22:02:140
81530,0rcu_preempt19-21ksoftirqd/100:32:551
81530,0rcu_preempt19-21ksoftirqd/100:11:411
10050530,0irq/346-48484006356-1kworker/0:0H23:27:010
81520,0rcu_preempt19-21ksoftirqd/123:27:171
81520,0rcu_preempt19-21ksoftirqd/123:25:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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