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2025-10-13 - 23:31

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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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 Mon Oct 13, 2025 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81680,0rcu_preempt19840-21kworker/0:010:26:000
81630,0rcu_preempt31496-21kworker/0:211:18:170
81620,0rcu_preempt17580-21ping08:10:440
81590,0rcu_preempt19-21ksoftirqd/111:15:111
10050580,0irq/346-484840028535-1kworker/0:1H11:45:320
81560,0rcu_preempt3-21ksoftirqd/012:30:370
81560,0rcu_preempt3-21ksoftirqd/012:25:340
81560,0rcu_preempt3-21ksoftirqd/012:05:280
81560,0rcu_preempt3-21ksoftirqd/010:45:370
81560,0rcu_preempt3-21ksoftirqd/010:35:280
81550,0rcu_preempt3-21ksoftirqd/012:04:230
81550,0rcu_preempt3-21ksoftirqd/009:45:290
81540,0rcu_preempt54-21kswapd011:21:391
81540,0rcu_preempt3-21ksoftirqd/012:15:450
81540,0rcu_preempt3-21ksoftirqd/012:15:450
81540,0rcu_preempt3-21ksoftirqd/010:15:350
81540,0rcu_preempt3-21ksoftirqd/009:35:300
81540,0rcu_preempt3-21ksoftirqd/009:15:290
81540,0rcu_preempt3-21ksoftirqd/009:05:310
81540,0rcu_preempt3-21ksoftirqd/008:09:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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