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2026-04-27 - 16:40

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 Mon Apr 27, 2026 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4010690994842,5cyclictest252-21systemd-journal10:25:000
4010690994337,4cyclictest117094-21cp12:00:000
4010690994336,5cyclictest4073582-21latency_hist08:10:010
4010698994236,4cyclictest80806-21latency_hist11:25:012
4010700993934,3cyclictest4026433-21cp07:25:003
4010690993833,4cyclictest1949870-21kworker/u8:0+flush-259:007:15:210
4010694993732,4cyclictest44924-21kworker/u8:3+flush-259:011:10:001
4010690993732,3cyclictest1949870-21kworker/u8:0+flush-259:007:40:240
4010690993730,5cyclictest4165242-21ntpq09:35:230
4010690993632,3cyclictest8654-21kworker/u8:0+events_unbound11:55:000
4010700993422,4cyclictest101686-21apt-get11:45:123
4010694993427,4cyclictest252-21systemd-journal08:10:421
4010690993428,5cyclictest153908-21cat12:35:010
4010690993427,5cyclictest105666-21ntpq11:45:210
4010690993329,3cyclictest4160957-21kworker/u8:0+flush-259:009:45:000
4010700993227,4cyclictest116927-21http12:00:003
4010698993228,3cyclictest4042583-21apt-get07:40:112
4010698993226,4cyclictest252-21systemd-journal11:35:002
4010690993227,4cyclictest39978-21diskstats10:45:130
4010694993127,3cyclictest111952-21kworker/u8:4+flush-259:011:55:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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