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2025-12-18 - 14:28

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 50 highest latencies:
System rack7slot2s.osadl.org (updated Fri Dec 12, 2025 00:48:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
89926399306221,42cyclictest930034-21kworker/u9:4-xprtiod1
89926299282123,108cyclictest920216-21kworker/u10:1-events_unbound0
89926299274119,114cyclictest950641-21kworker/u10:10-events_unbound0
89926299274119,114cyclictest950641-21kworker/u10:10-events_unbound0
89926299273176,67cyclictest963170-21ntpq0
89926299273121,119cyclictest920216-21kworker/u10:1+rpciod0
89926299273121,119cyclictest920216-21kworker/u10:1+rpciod0
89926399272210,18cyclictest944109-21kworker/u9:12-rpciod1
89926399272210,18cyclictest944109-21kworker/u9:12-rpciod1
89926299272160,77cyclictest14-21ksoftirqd/00
89926299272160,77cyclictest14-21ksoftirqd/00
89926299272141,61cyclictest171rcu_preempt0
89926399270242,14cyclictest0-21swapper/11
89926399270242,14cyclictest0-21swapper/11
89926299270169,68cyclictest913949-21ntpq0
89926299270169,68cyclictest913949-21ntpq0
89926299270156,72cyclictest171rcu_preempt0
89926299269179,54cyclictest171rcu_preempt0
89926299269179,54cyclictest171rcu_preempt0
89926299269143,79cyclictest900881-21kworker/u10:8-flush-0:440
89926399268214,26cyclictest171rcu_preempt1
89926299268165,70cyclictest932537-21apt-get0
89926299268165,70cyclictest932537-21apt-get0
89926299268164,69cyclictest946270-21kworker/u9:1+xprtiod0
89926399267217,34cyclictest0-21swapper/11
89926399267217,34cyclictest0-21swapper/11
89926299267158,70cyclictest956021-21kworker/u9:12+rpciod0
89926299267158,70cyclictest956021-21kworker/u9:12+rpciod0
89926299267155,71cyclictest922494-21kworker/u9:9+rpciod0
89926399265221,29cyclictest0-21swapper/11
89926399265221,29cyclictest0-21swapper/11
89926299265180,53cyclictest171rcu_preempt0
89926299265180,53cyclictest171rcu_preempt0
89926299265180,52cyclictest171rcu_preempt0
89926299265180,52cyclictest171rcu_preempt0
89926299265178,54cyclictest171rcu_preempt0
89926299265158,90cyclictest0-21swapper/00
89926299265142,100cyclictest931144-21kworker/u10:6-flush-0:440
89926299265142,100cyclictest931144-21kworker/u10:6-flush-0:440
89926399264235,17cyclictest0-21swapper/11
89926399263236,14cyclictest0-21swapper/11
89926399263220,31cyclictest0-21swapper/11
89926399263219,32cyclictest0-21swapper/11
89926399263219,32cyclictest0-21swapper/11
89926399263219,30cyclictest0-21swapper/11
89926399263219,30cyclictest0-21swapper/11
89926399263217,30cyclictest0-21swapper/11
89926299263180,53cyclictest171rcu_preempt0
89926299263180,53cyclictest171rcu_preempt0
89926299263179,53cyclictest171rcu_preempt0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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