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2026-03-30 - 10:26

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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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 rackeslot5s.osadl.org (updated Mon Mar 30, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2356399270,26cyclictest16788-21diskmemload22:45:012
23550992724,2cyclictest14616-21cron21:40:010
2356399260,25cyclictest16788-21diskmemload23:53:482
2356399260,25cyclictest16788-21diskmemload23:06:182
2356399260,25cyclictest0-21swapper/200:15:022
2356399260,25cyclictest0-21swapper/200:13:082
2356399260,23cyclictest0-21swapper/221:59:592
2355899260,25cyclictest29677-21ssh00:33:421
2356399250,4cyclictest6275-21ssh21:32:302
2356399250,25cyclictest0-21swapper/200:29:422
2356399250,24cyclictest606-21dbus-daemon19:20:012
2356399250,24cyclictest32411-21ssh23:01:542
2356399250,24cyclictest0-21swapper/222:41:422
2356399250,24cyclictest0-21swapper/222:14:122
2356399250,24cyclictest0-21swapper/222:04:562
2356399250,24cyclictest0-21swapper/221:14:112
2356399250,24cyclictest0-21swapper/219:23:152
23558992523,1cyclictest0-21swapper/122:20:131
23558992523,1cyclictest0-21swapper/122:20:131
2355899250,24cyclictest606-21dbus-daemon19:30:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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