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2025-11-07 - 09:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #2

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 10 highest latencies:
System rack7slot2s.osadl.org (updated Fri Nov 07, 2025 00:49:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
285846699284157,77cyclictest2885861-21kworker/u9:2+rpciod23:55:050
285846699282162,106cyclictest2859701-21ntp_kernel_pll_19:16:210
285846699282162,106cyclictest2859701-21ntp_kernel_pll_19:16:210
285846699278180,85cyclictest2895136-21grep22:27:020
285846699278180,85cyclictest2895136-21grep22:27:020
285846699276173,89cyclictest2918229-21sh00:16:190
285846699276158,102cyclictest2878495-21diskmemload00:31:070
285846699276158,102cyclictest2878495-21diskmemload00:31:070
285846699274172,70cyclictest171rcu_preempt00:01:390
285846699271211,48cyclictest2902580-21/usr/sbin/munin23:02:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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