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2025-12-30 - 15:29

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 Dec 30, 2025 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811540,0rcu_preempt17891-21diskmemload10:05:521
811530,0rcu_preempt3-21ksoftirqd/010:58:220
811490,0rcu_preempt11033-21cyclictest10:59:041
811480,0rcu_preempt3-21ksoftirqd/011:23:310
811430,0rcu_preempt10519-1kworker/0:2H10:15:250
811370,0rcu_preempt3-21ksoftirqd/009:38:110
811350,0rcu_preempt54-21kswapd008:15:270
811350,0rcu_preempt11033-21cyclictest10:36:320
81890,0rcu_preempt3-21ksoftirqd/011:30:240
81800,0rcu_preempt19-21ksoftirqd/111:29:571
81790,0rcu_preempt3-21ksoftirqd/011:05:060
81790,0rcu_preempt19-21ksoftirqd/110:43:301
81760,0rcu_preempt11033-21cyclictest10:08:570
81750,0rcu_preempt3-21ksoftirqd/010:49:300
81740,0rcu_preempt3-21ksoftirqd/009:21:170
81740,0rcu_preempt19-21ksoftirqd/110:52:581
81740,0rcu_preempt17891-21diskmemload09:14:131
81720,0rcu_preempt54-21kswapd012:04:191
274202720,0chrt9950irq/345-484840009:56:110
319522710,0sleep010050irq/346-484840008:11:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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