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2026-03-27 - 16:09

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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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 10 highest latencies:
System rackeslot4s.osadl.org (updated Fri Mar 27, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1119807994339,3cyclictest1235760-21kworker/u8:0+flush-259:009:05:000
1119812993730,5cyclictest252-21systemd-journal10:05:001
1119819993631,4cyclictest1214675-21apt-get08:40:112
1119807993633,2cyclictest1114213-21kworker/u8:3+events_unbound07:55:140
1119822993530,3cyclictest1355029-21kworker/u8:4+flush-259:011:20:213
1119807993530,4cyclictest1349923-21apt-get10:50:130
1119807993330,2cyclictest1291841-21kworker/u8:1+flush-259:010:10:250
1119807993330,2cyclictest1245491-21kworker/u8:3+events_unbound09:40:230
1119807993229,2cyclictest2267822-21kworker/u8:2+flush-259:007:40:240
1119807993228,3cyclictest1187287-21kworker/u8:3+events_unbound08:35:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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