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2025-12-07 - 15:10

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 Dec 07, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811180,0rcu_preempt19-21ksoftirqd/111:54:431
81950,0rcu_preempt19-21ksoftirqd/110:49:541
10050790,0irq/346-48484001222-1kworker/0:3H11:55:370
303662770,0chrt9950irq/345-484840008:22:580
10050760,0irq/346-484840054-21kswapd012:32:410
10050760,0irq/346-484840054-21kswapd009:35:590
10050740,0irq/346-484840054-21kswapd010:18:010
81720,0rcu_preempt16941-21apt-get09:59:330
10050720,0irq/346-48484000-21swapper/012:36:240
286642700,0sleep010050irq/346-484840008:17:270
286642700,0sleep010050irq/346-484840008:17:270
10050690,0irq/346-48484000-21swapper/012:12:380
10050690,0irq/346-48484000-21swapper/010:48:350
81670,0rcu_preempt30988-1kworker/0:4H11:03:350
81660,0rcu_preempt3-21ksoftirqd/010:58:510
81630,0rcu_preempt19-21ksoftirqd/111:45:171
52562610,0sleep19950irq/345-484840010:25:261
10050610,0irq/346-484840025408-1kworker/1:1H09:45:161
10050610,0irq/346-484840012662-1kworker/1:3H12:10:231
81600,0rcu_preempt19-21ksoftirqd/112:03:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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