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2025-11-13 - 06:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.
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 20 highest latencies:
System rackeslot5s.osadl.org (updated Wed Nov 12, 2025 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
283499290,28cyclictest593-21dbus-daemon07:45:003
282999250,24cyclictest7557-21cron07:19:592
2834992422,1cyclictest0-21swapper/307:50:003
2834992420,4cyclictest0-21swapper/310:29:593
2829992422,1cyclictest19074-21apt-get09:56:192
282699240,23cyclictest3145-21apt-get07:11:171
282699240,23cyclictest23531-21latency_hist10:05:001
282699240,23cyclictest0-21swapper/110:21:201
2834992321,1cyclictest14204-21cron08:39:593
283499230,3cyclictest19794-21apt-get08:51:193
283499230,22cyclictest31104-21apt-get10:21:193
283499230,22cyclictest25191-21turbostat11:15:003
283499230,22cyclictest14844-21latency_hist07:35:013
283499230,22cyclictest0-21swapper/312:16:223
283499230,22cyclictest0-21swapper/312:16:223
2829992323,0cyclictest0-21swapper/209:16:162
2829992322,1cyclictest30769-21apt-get11:26:182
2829992321,1cyclictest16679-21apt-get09:51:212
282999230,2cyclictest23536-21sleep10:05:012
282999230,22cyclictest10402-21latency_hist10:45:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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