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2026-06-22 - 02:27

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 20 highest latencies:
System rackeslot4s.osadl.org (updated Sun Jun 21, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3978424995956,2cyclictest3978407-21kworker/u8:0+flush-259:007:30:010
3978424995956,2cyclictest3978407-21kworker/u8:0+flush-259:007:30:000
3978424994743,3cyclictest4134151-21kworker/u8:2+events_unbound10:40:010
3978424994642,2cyclictest1-21systemd11:25:000
3978434994542,2cyclictest4176914-21kworker/u8:4+flush-259:010:25:233
3978424994340,2cyclictest4134151-21kworker/u8:2+flush-259:011:10:000
3978424994338,3cyclictest335557-21systemd-journal08:50:000
3978426994236,4cyclictest335557-21systemd-journal12:05:001
3978434994036,3cyclictest34631-21kworker/u8:0+flush-259:011:35:013
3978434993833,3cyclictest118248-21/usr/sbin/munin12:30:153
3978429993831,5cyclictest4128942-21latency_hist09:35:012
3978426993833,3cyclictest4176914-21kworker/u8:4+flush-259:010:25:151
3978424993834,3cyclictest76288-21kworker/u8:4+flush-259:012:00:200
3978434993734,2cyclictest3993873-21kworker/u8:1+events_unbound07:40:243
3978429993730,5cyclictest97326-21latency_hist12:10:002
3978426993733,3cyclictest3993873-21kworker/u8:1+flush-259:007:40:011
3978426993732,3cyclictest65776-21kworker/u8:1+flush-259:011:40:001
3978426993730,5cyclictest4154774-21apt-get10:00:011
3978434993633,2cyclictest4134151-21kworker/u8:2+flush-259:011:25:003
3978434993532,2cyclictest92159-21kworker/u8:1+flush-259:012:15:153
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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