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2026-06-27 - 04:46

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 Jun 27, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12642722248176,60sleep40-21swapper/419:05:084
12665242237172,20sleep60-21swapper/619:06:086
12666572231166,20sleep00-21swapper/019:08:030
12667142221188,22sleep10-21swapper/119:08:521
12665302221160,49sleep30-21swapper/319:06:133
12666822216178,24sleep50-21swapper/519:08:245
12664842211180,21sleep20-21swapper/219:05:312
12667492208175,21sleep70-21swapper/719:09:237
126701299300,25cyclictest1413931-21awk23:15:176
126699699300,29cyclictest1403349-21sendmail23:00:000
126699699290,28cyclictest1411074-21sh23:10:190
126701299280,27cyclictest0-21swapper/620:00:016
126699699280,27cyclictest1416922-21ntpq23:20:160
126699699280,27cyclictest1388587-21apt22:35:000
126701499270,4cyclictest3422186-21systemd-journal23:40:017
1267001992722,4cyclictest1463339-21sendmail00:40:002
126699699270,26cyclictest1415139-21apt-get23:20:010
126699699270,26cyclictest0-21swapper/000:25:050
126701299260,22cyclictest1460390-21awk00:35:006
126699699260,0cyclictest0-21swapper/021:55:130
126699699260,0cyclictest0-21swapper/021:55:130
126701299250,25cyclictest1-21systemd22:00:006
126701299250,25cyclictest1-21systemd22:00:006
126701299250,22cyclictest0-21swapper/600:20:116
126700999257,18cyclictest0-21swapper/522:23:565
1267009992521,4cyclictest1440936-21ptp4l-jitter00:00:215
126700399250,25cyclictest1426989-21cron23:40:003
126700399250,24cyclictest0-21swapper/300:19:593
126700099250,24cyclictest1463430-21appstreamcli00:40:001
126700099250,24cyclictest1351933-21grep21:30:171
126699699250,24cyclictest0-21swapper/022:00:120
126699699250,24cyclictest0-21swapper/021:25:180
126699699250,0cyclictest0-21swapper/023:25:130
126699699250,0cyclictest0-21swapper/022:45:030
126699699250,0cyclictest0-21swapper/020:20:110
126701499240,1cyclictest1391538-21munin-run22:40:007
1267012992419,4cyclictest0-21swapper/620:30:136
126701299240,24cyclictest0-21swapper/621:45:186
126701299240,23cyclictest0-21swapper/623:40:096
126701299240,23cyclictest0-21swapper/621:25:196
126701299240,23cyclictest0-21swapper/600:25:146
126701299240,1cyclictest1460812-21apt-get00:35:116
1267009992422,1cyclictest1427048-21sendmail23:40:015
126700999240,23cyclictest1412184-21cron23:15:015
126700799240,23cyclictest1341785-21apt-get21:15:134
1267003992422,2cyclictest1421507-21apt-get23:30:113
126700199240,1cyclictest0-21swapper/222:15:102
1267000992422,2cyclictest1367876-21apt-get22:00:021
1266996992419,5cyclictest0-21swapper/020:00:010
126699699240,1cyclictest1382716-21systemctl22:25:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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