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2025-05-05 - 00:42

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 Sun May 04, 2025 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81980,0rcu_preempt22252-21kworker/0:110:27:070
81940,0rcu_preempt3-21ksoftirqd/011:43:110
81910,0rcu_preempt3-21ksoftirqd/007:23:230
81890,0rcu_preempt3-21ksoftirqd/007:38:220
81880,0rcu_preempt3-21ksoftirqd/011:27:590
81760,0rcu_preempt21011-21kworker/0:110:08:130
10050760,0irq/346-48484007140-1kworker/0:0H11:57:160
81730,0rcu_preempt3-21ksoftirqd/012:17:150
81720,0rcu_preempt3-21ksoftirqd/009:26:250
10050720,0irq/346-484840012449-1kworker/0:2H11:32:590
81710,0rcu_preempt3-21ksoftirqd/012:27:580
81710,0rcu_preempt3-21ksoftirqd/008:25:000
81700,0rcu_preempt3-21ksoftirqd/008:07:470
81700,0rcu_preempt28882-1kworker/0:2H11:18:140
10050700,0irq/346-484840012952-1kworker/0:2H09:53:550
81680,0rcu_preempt3-21ksoftirqd/009:32:290
81670,0rcu_preempt3-21ksoftirqd/010:29:430
81650,0rcu_preempt3-21ksoftirqd/007:08:130
81640,0rcu_preempt8792-21kworker/0:108:13:140
81640,0rcu_preempt21011-21kworker/0:110:05:480
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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