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2026-08-06 - 11:30

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 Thu Aug 06, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
154402994238,3cyclictest335557-21systemd-journal20:17:391
154408993936,2cyclictest274360-21kworker/u8:3+flush-259:021:05:263
154405993934,4cyclictest335557-21systemd-journal23:45:412
154402993733,3cyclictest456885-21kworker/u8:3+flush-259:000:00:151
154398993733,3cyclictest509-21rs:main0
154405993633,2cyclictest90588-21kworker/u8:3+events_unbound19:10:012
154402993632,3cyclictest274360-21kworker/u8:3+events_unbound21:25:011
15439899360,35cyclictest1-21systemd21:50:330
154408993532,2cyclictest264602-21kworker/u8:0+flush-259:020:55:263
154408993529,4cyclictest461820-21latency_hist00:05:013
154398993529,4cyclictest305865-21latency_hist21:35:010
154408993430,3cyclictest175937-21kworker/u8:4+events_unbound20:20:003
154408993330,2cyclictest351974-21kworker/u8:3+events_unbound22:39:403
154408993329,3cyclictest175937-21kworker/u8:4+events_unbound19:45:213
154408993328,4cyclictest413937-21ntpq23:15:203
154408993328,4cyclictest413937-21ntpq23:15:203
154402993329,3cyclictest467241-21apt-get00:10:101
154402993329,3cyclictest211755-21kworker/u8:0+flush-259:020:35:241
154402993329,3cyclictest175937-21kworker/u8:4+events_unbound20:10:221
154408993228,3cyclictest351974-21kworker/u8:3+flush-259:022:30:433
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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