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2026-05-04 - 05:50

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 Mon May 04, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1629919994436,5cyclictest1738885-21latency_hist20:55:003
1629913994441,2cyclictest1744098-21kworker/u8:3+events_unbound21:30:202
1629907994440,3cyclictest1718329-21kworker/u8:2+flush-259:020:35:000
1629913994340,2cyclictest1931016-21kworker/u8:0+flush-259:000:20:222
1629913994339,3cyclictest1692582-21kworker/u8:0+flush-259:020:25:212
1629907994338,3cyclictest1624745-21kworker/u8:2+events_unbound19:20:010
1629919994134,5cyclictest1862753-21ntpq22:50:213
1629913993933,4cyclictest1635147-21cp19:15:012
1629919993831,5cyclictest1784895-21ntpq21:35:233
1629910993828,2cyclictest1785580-21kworker/u8:0+events_unbound22:05:011
1629913993731,4cyclictest1759594-21latency_hist21:15:012
1629910993734,2cyclictest1874151-21kworker/u8:2+events_unbound23:05:211
1629913993633,2cyclictest1931016-21kworker/u8:0+flush-259:000:10:012
1629913993632,3cyclictest1796298-21kworker/u8:3+flush-259:022:10:212
1629913993631,3cyclictest252-21systemd-journal00:03:332
1629910993633,2cyclictest1785580-21kworker/u8:0+flush-259:021:50:211
1629907993629,5cyclictest1821025-21ntpq22:10:200
1629919993530,3cyclictest1656803-21apt-get19:35:133
1629913993431,2cyclictest1904846-21kworker/u8:2+flush-259:023:50:002
1629913993431,2cyclictest1744098-21kworker/u8:3+flush-259:021:20:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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