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2026-04-30 - 17:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot4s.osadl.org (updated Thu Apr 30, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
907967993835,2cyclictest1006416-21kworker/u8:2+flush-259:009:19:590
907972993732,3cyclictest252-21systemd-journal10:16:221
907981993531,3cyclictest1121332-21kworker/u8:1+events_unbound10:57:343
907977993531,2cyclictest1099749-21fdisk10:15:572
907967993531,3cyclictest1105832-21kworker/u8:2+events_unbound10:51:440
907981993431,2cyclictest892820-21kworker/u8:1+flush-259:007:15:013
907972993430,3cyclictest1147776-21kworker/u8:0+flush-259:011:35:561
907967993330,2cyclictest1017532-21apt-get09:00:110
907981993228,3cyclictest1094427-21kworker/u8:1+events_unbound10:16:253
907967993227,4cyclictest1006416-21kworker/u8:2+flush-259:009:05:220
907981993128,2cyclictest3055436-21kworker/u8:2+events_unbound07:20:143
907967993124,5cyclictest1210116-21diskstats12:05:120
907981992925,3cyclictest907905-21latency_hist07:10:003
907981992925,3cyclictest1022450-21kworker/u8:0+flush-259:010:05:343
907967992925,3cyclictest1006636-21apt-get08:45:120
907981992824,3cyclictest1022450-21kworker/u8:0+flush-259:009:50:163
907981992823,3cyclictest252-21systemd-journal11:10:453
907967992824,3cyclictest1048388-21apt-get09:30:100
907981992724,2cyclictest918292-21kworker/u8:3+events_unbound07:35:193
907981992724,2cyclictest892820-21kworker/u8:1+events_unbound08:10:203
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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