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2026-03-29 - 21:47

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 Sun Mar 29, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3312563993834,3cyclictest3380316-21apt-get08:15:110
3312565993732,3cyclictest3348917-21apt-get07:45:141
3312565993732,3cyclictest3348917-21apt-get07:45:131
3312565993631,3cyclictest3477912-21kworker/u8:2+flush-259:011:25:171
3312573993431,2cyclictest3374583-21gpgv08:10:003
3312565993430,3cyclictest3472968-21apt-get09:45:121
3312565993428,4cyclictest3410936-21latency_hist08:45:001
3312573993330,2cyclictest3576374-21kworker/u8:1+flush-259:011:35:013
3312573993025,3cyclictest3509433-21/usr/sbin/munin10:20:133
3312565993027,2cyclictest3623231-21kworker/u8:1+flush-259:012:15:161
3312565993026,3cyclictest3354097-21apt-get07:50:101
3312563993027,2cyclictest3555759-21apt-get11:05:130
3312563993024,4cyclictest3649531-21cp12:35:000
3312573992925,3cyclictest3477912-21kworker/u8:2+flush-259:011:50:213
3312563992923,4cyclictest252-21systemd-journal12:02:350
3312565992824,3cyclictest3385480-21apt-get08:20:111
3312563992723,3cyclictest3591260-21ntpq11:35:220
3312563992723,3cyclictest3576374-21kworker/u8:1+events_unbound11:30:000
3312573992623,2cyclictest3560887-21kworker/u8:3+flush-259:011:15:013
3312569992620,4cyclictest509-21rs:main2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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