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2026-05-12 - 22:10

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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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 Tue May 12, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1788420212556,64sleep30-21swapper/33
212182721150,1sleep10-21swapper/11
178835428858,11sleep20-21swapper/22
178841328757,12sleep10-21swapper/11
178842727858,14sleep00-21swapper/00
22679062241,8sleep02267919-21sh0
178871099221,17cyclictest1959537-21taskset3
178871099216,1cyclictest0-21swapper/33
178871099216,12cyclictest2208555-21turbostat3
178871099211,16cyclictest0-21swapper/33
178871099201,15cyclictest0-21swapper/33
178871099201,15cyclictest0-21swapper/33
178871099201,15cyclictest0-21swapper/33
178871099201,15cyclictest0-21swapper/33
178871099201,14cyclictest66950irq/132-enp1s0-TxRx-33
178871099201,13cyclictest0-21swapper/33
178871099200,17cyclictest0-21swapper/33
178871099200,16cyclictest2036371-21chrt3
178871099200,16cyclictest1977771-21taskset3
21963272192,3sleep00-21swapper/00
21740492191,14sleep01919042-21diskmemload0
178871099199,6cyclictest0-21swapper/33
178871099191,14cyclictest66950irq/132-enp1s0-TxRx-33
178871099191,14cyclictest0-21swapper/33
1788710991910,6cyclictest20026912sleep33
20537242181,2sleep12053736-21rm1
1788710991815,2cyclictest0-21swapper/33
178871099181,4cyclictest0-21swapper/33
1788710991812,3cyclictest0-21swapper/33
1788710991811,5cyclictest66950irq/132-enp1s0-TxRx-33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,14cyclictest0-21swapper/33
178871099181,13cyclictest0-21swapper/33
178871099181,13cyclictest0-21swapper/33
178871099181,13cyclictest0-21swapper/33
178871099181,13cyclictest0-21swapper/33
178871099181,13cyclictest0-21swapper/33
178871099181,12cyclictest1913665-21taskset3
178871099180,15cyclictest0-21swapper/33
178871099180,15cyclictest0-21swapper/33
20612992170,3sleep10-21swapper/11
178871099177,6cyclictest1903042-21turbostat3
1788710991715,1cyclictest0-21swapper/33
1788710991713,2cyclictest0-21swapper/33
178871099171,14cyclictest0-21swapper/33
178871099171,14cyclictest0-21swapper/33
178871099171,13cyclictest0-21swapper/33
178871099171,13cyclictest0-21swapper/33
178871099171,13cyclictest0-21swapper/33
178871099170,14cyclictest0-21swapper/33
178871099170,14cyclictest0-21swapper/33
22570732161,4sleep21919042-21diskmemload2
22568222161,2sleep10-21swapper/11
22507752161,4sleep21919042-21diskmemload2
21912122161,2sleep20-21swapper/22
21448452162,8sleep02144901-21ntpq0
21062432161,2sleep00-21swapper/00
20700122160,1sleep10-21swapper/11
20627172161,2sleep00-21swapper/00
178871099160,13cyclictest0-21swapper/33
178871099160,13cyclictest0-21swapper/33
178871099160,13cyclictest0-21swapper/33
178871099160,12cyclictest0-21swapper/33
178871099160,12cyclictest0-21swapper/33
22753922150,2sleep00-21swapper/00
22667442151,4sleep11919042-21diskmemload1
20447522151,2sleep10-21swapper/11
20351972152,7sleep02035344-21/usr/sbin/munin0
19341902151,3sleep10-21swapper/11
19263272151,2sleep20-21swapper/22
18647862151,7sleep00-21swapper/00
18330452150,1sleep10-21swapper/11
178871099153,8cyclictest0-21swapper/33
178871099150,12cyclictest0-21swapper/33
178871099150,12cyclictest0-21swapper/33
178871099150,12cyclictest0-21swapper/33
178871099150,12cyclictest0-21swapper/33
22241542140,4sleep20-21swapper/22
21782922141,4sleep11919042-21diskmemload1
20903572141,8sleep10-21swapper/11
19695372141,4sleep11969548-21ssh1
19498422141,4sleep11949852-21ssh1
178871099141,11cyclictest0-21swapper/33
178871099140,13cyclictest0-21swapper/33
178871099140,11cyclictest0-21swapper/33
178871099140,10cyclictest0-21swapper/33
22737312130,4sleep12273748-21ssh1
22726262131,7sleep21919042-21diskmemload2
22601362131,8sleep22260162-21apt-get2
22490772131,8sleep01919042-21diskmemload0
22342742132,5sleep22234300-21apt-get2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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