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2026-07-11 - 05:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 50 highest latencies:
System rack8slot4s.osadl.org (updated Sat Jul 11, 2026 00:44:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13740702257180,26sleep20-21swapper/219:08:062
13739522247174,22sleep50-21swapper/519:06:245
13739952241169,20sleep10-21swapper/119:07:001
13739502231197,22sleep30-21swapper/319:06:223
13739262231170,50sleep60-21swapper/619:06:026
13740632225191,22sleep40-21swapper/419:08:004
13740572225187,25sleep70-21swapper/719:07:557
13740322215181,23sleep00-21swapper/019:07:310
137442499300,29cyclictest0-21swapper/722:25:007
137442499290,28cyclictest0-21swapper/723:55:127
137442499290,28cyclictest0-21swapper/723:00:007
137442499270,26cyclictest0-21swapper/723:05:177
1374424992621,4cyclictest1518373-21awk23:10:177
137442499260,25cyclictest1457652-21munin-run21:30:007
137442499260,25cyclictest1410480-21awk20:10:007
137442499260,25cyclictest0-21swapper/720:45:197
137442499260,25cyclictest0-21swapper/700:30:187
137442499260,25cyclictest0-21swapper/700:25:187
137442099260,25cyclictest1431141-21turbostat20:45:005
137441199260,25cyclictest1475318-21idleruntime-cro22:00:002
137440999260,4cyclictest1536203-21ntp_states23:40:201
1374424992522,3cyclictest0-21swapper/722:10:117
1374424992520,5cyclictest0-21swapper/719:45:007
1374424992519,5cyclictest0-21swapper/720:15:017
137442499250,24cyclictest1499002-21sleep22:40:007
137442499250,24cyclictest1499002-21sleep22:40:007
137442499250,24cyclictest0-21swapper/700:00:127
1374420992522,2cyclictest1487540-21appstreamcli22:20:055
137442099250,24cyclictest1395736-21turbostat19:45:005
137442099250,24cyclictest1383977-21basename19:25:005
137441799250,24cyclictest0-21swapper/419:25:184
137441499250,3cyclictest1439972-21perf21:00:003
137441499250,24cyclictest1507817-21munin-run22:55:003
137441499250,24cyclictest0-21swapper/320:20:113
137441199250,24cyclictest0-21swapper/219:30:132
1374424992420,3cyclictest0-21swapper/723:45:117
1374424992418,5cyclictest1561816-21awk00:24:597
137442499240,5cyclictest0-21swapper/721:20:117
137442499240,23cyclictest0-21swapper/719:30:137
137442499240,23cyclictest0-21swapper/719:20:027
1374422992423,1cyclictest0-21swapper/622:35:116
1374422992423,1cyclictest0-21swapper/622:35:116
1374422992423,1cyclictest0-21swapper/600:30:126
1374422992420,3cyclictest3422186-21systemd-journal20:40:006
1374420992423,1cyclictest1435890-21ntpq20:50:185
137441799242,21cyclictest0-21swapper/400:20:124
137441799240,23cyclictest0-21swapper/423:10:174
1374414992420,3cyclictest1404590-21awk20:00:013
137441499240,24cyclictest0-21swapper/322:20:003
137441199240,24cyclictest1465252-21ntpq21:40:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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