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2026-04-10 - 12:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 here to display the system's profile data or here to proceed to next system.
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 20 highest latencies:
System rackcslot7s.osadl.org (updated Fri Apr 10, 2026 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12273721320,4sleep10-21swapper/122:30:111
14904321070,3sleep00-21swapper/023:45:010
725632980,3sleep00-21swapper/020:05:110
139099760,66rtkit-daemon0-21swapper/119:06:061
5002727447,17sleep30-21swapper/319:05:113
5047526944,17sleep20-21swapper/219:05:192
5132626242,14sleep00-21swapper/019:07:530
1602442470,4sleep00-21swapper/000:15:120
139099430,3rtkit-daemon0-21swapper/022:56:590
653542360,4sleep00-21swapper/019:45:140
51712992718,6cyclictest124211-21sh22:35:003
51712992716,8cyclictest159669-21cron00:15:003
1094472270,4sleep33056-21PK-Backend21:50:153
139099260,4rtkit-daemon1389-21rtkit-daemon19:15:040
5171299252,5cyclictest0-21swapper/323:55:113
51712992515,7cyclictest436-20systemd-journal21:14:593
5169899250,23cyclictest1389-21rtkit-daemon19:30:130
1444312250,3chrt0-21swapper/323:30:123
51712992415,5cyclictest161683-21turbostat00:20:003
51707992315,6cyclictest93622-21df21:05:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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