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2026-04-24 - 13:21

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 Fri Apr 24, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3327556994540,3cyclictest3587190-21kworker/u8:1+flush-259:023:30:003
3327556994437,5cyclictest3363121-21ntpq19:40:223
3327556994035,3cyclictest3525397-21/usr/sbin/munin22:20:153
3327556993933,4cyclictest3571732-21/usr/sbin/munin23:05:203
3327548993933,4cyclictest3556076-21latency_hist22:50:001
3327551993730,6cyclictest3396052-21kworker/u8:4+flush-259:020:25:012
3327551993730,6cyclictest3396052-21kworker/u8:4+flush-259:020:25:012
3327551993729,6cyclictest3545782-21awk22:40:002
3327551993729,6cyclictest3545782-21awk22:40:002
3327556993632,3cyclictest3587190-21kworker/u8:1+flush-259:023:35:003
3327551993633,2cyclictest3412092-21kworker/u8:0+events_unbound22:10:002
3327548993631,4cyclictest3432039-21/usr/sbin/munin20:50:131
3327546993630,4cyclictest3581793-21latency_hist23:15:010
3327546993629,5cyclictest3420645-21ntpq20:35:200
3327556993428,4cyclictest3623264-21cp23:55:013
3327548993428,4cyclictest3623924-21diskstats23:55:141
3327556993227,4cyclictest3358728-21kworker/u8:1+flush-259:019:50:003
3327551993226,4cyclictest3525202-21kworker/u8:3+flush-259:022:30:002
3327548993226,5cyclictest3343125-21base6419:25:011
3327551993127,3cyclictest3374286-21kworker/u8:3+events_unbound20:10:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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