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2026-03-29 - 22:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot3s.osadl.org (updated Sun Mar 29, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2205387212952,72sleep30-21swapper/33
220551029059,12sleep20-21swapper/22
220548928556,12sleep10-21swapper/11
220563428153,14sleep00-21swapper/00
26368052251,8sleep02636870-21ntp_states0
26804962230,2sleep2421rcuc/22
25083232230,2sleep0221rcuc/00
22624632221,5sleep02263951-21kthreadcore0
220584199221,17cyclictest2630698-21taskset3
220584199221,17cyclictest0-21swapper/33
2205841992118,1cyclictest0-21swapper/33
25367762201,4sleep22537045-21ssh2
220584199202,13cyclictest2493416-21taskset3
2205841992011,5cyclictest26386532sleep33
220584199201,15cyclictest2614608-21turbostat3
25275832191,3sleep20-21swapper/22
23976792191,13sleep12397710-21ssh1
220584199199,7cyclictest2657645-21chrt3
220584199198,8cyclictest2272304-21turbostat3
220584199191,6cyclictest2379398-21taskset3
220584199191,15cyclictest0-21swapper/33
220584199191,15cyclictest0-21swapper/33
220584199191,15cyclictest0-21swapper/33
220584199191,15cyclictest0-21swapper/33
220584199191,15cyclictest0-21swapper/33
220584199191,14cyclictest0-21swapper/33
220584199191,14cyclictest0-21swapper/33
220584199191,14cyclictest0-21swapper/33
220584199191,14cyclictest0-21swapper/33
220584199190,15cyclictest26748072chrt3
24994932181,2sleep00-21swapper/00
24236682181,5sleep12423699-21ssh1
220584199187,8cyclictest2282939-21turbostat3
2205841991814,2cyclictest0-21swapper/33
220584199181,3cyclictest2213375-21taskset3
220584199181,15cyclictest0-21swapper/33
220584199181,14cyclictest2421929-21chrt3
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,14cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199181,13cyclictest0-21swapper/33
220584199180,15cyclictest0-21swapper/33
220584199180,14cyclictest0-21swapper/33
220584199180,14cyclictest0-21swapper/33
26201212171,4sleep134-21ksoftirqd/11
26201212171,4sleep134-21ksoftirqd/11
24809472176,2sleep0171rcu_preempt0
220584199172,13cyclictest0-21swapper/33
2205841991711,4cyclictest0-21swapper/33
220584199171,14cyclictest0-21swapper/33
2205841991711,3cyclictest0-21swapper/33
220584199171,13cyclictest0-21swapper/33
220584199171,13cyclictest0-21swapper/33
220584199171,13cyclictest0-21swapper/33
220584199171,12cyclictest2240041-21taskset3
220584199171,12cyclictest0-21swapper/33
220584199170,15cyclictest0-21swapper/33
25521382161,3sleep12552148-21ssh1
25265102161,2sleep00-21swapper/00
25174032161,4sleep12336545-21diskmemload1
23871972160,1sleep20-21swapper/22
22979132161,5sleep22297969-21sed2
220584199168,5cyclictest2309380-21chrt3
220584199161,3cyclictest0-21swapper/33
220584199161,11cyclictest0-21swapper/33
220584199160,13cyclictest0-21swapper/33
220584199160,13cyclictest0-21swapper/33
220584199160,13cyclictest0-21swapper/33
26995962151,2sleep00-21swapper/00
26572112151,2sleep00-21swapper/00
25817302151,10sleep12583490-21sh1
25755682151,9sleep12571345-21/usr/sbin/munin1
25427792150,1sleep10-21swapper/11
25181362151,4sleep02518150-21ssh0
25099372156,5sleep2431ktimers/22
24569912151,10sleep12457004-21rm1
24379432151,3sleep20-21swapper/22
23972952151,3sleep20-21swapper/22
23466012151,11sleep00-21swapper/00
2205841991512,2cyclictest0-21swapper/33
2205841991512,1cyclictest0-21swapper/33
220584199150,13cyclictest0-21swapper/33
220584199150,12cyclictest0-21swapper/33
220584199150,12cyclictest0-21swapper/33
26931602141,4sleep22336545-21diskmemload2
26123072141,9sleep22336545-21diskmemload2
25581772141,8sleep12558236-21ntpq1
25073432140,3sleep12336545-21diskmemload1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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