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2026-05-05 - 05:54

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 Tue May 05, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
638341994134,5cyclictest700275-21latency_hist20:10:011
638341994036,3cyclictest939366-21kworker/u8:1+events_unbound00:26:231
638341994036,3cyclictest939366-21kworker/u8:1+events_unbound00:26:221
638341993832,3cyclictest830050-21kworker/u8:1+flush-259:022:30:161
638341993732,3cyclictest763984-21kworker/u8:1+flush-259:021:35:241
638344993327,4cyclictest939373-21cp00:00:002
638339993329,3cyclictest252-21systemd-journal20:56:210
638341993229,2cyclictest939366-21kworker/u8:1+flush-259:000:35:241
638341993225,5cyclictest870594-21ntpq22:50:241
638339993228,3cyclictest851074-21apt-get22:35:100
638344993024,4cyclictest252-21systemd-journal00:30:212
638339993024,4cyclictest741289-21ntpq20:45:220
638341992925,3cyclictest793405-21kworker/u8:3+flush-259:022:05:221
638341992923,4cyclictest793978-21apt-get21:40:121
638344992824,3cyclictest939366-21kworker/u8:1+flush-259:000:35:152
638341992825,2cyclictest928868-21kworker/u8:0+flush-259:023:55:201
638341992825,2cyclictest685045-21kworker/u8:1+events_unbound20:00:251
638341992824,3cyclictest928868-21kworker/u8:0+events_unbound00:00:141
638341992824,3cyclictest830050-21kworker/u8:1+events_unbound23:05:251
638341992824,3cyclictest793405-21kworker/u8:3+flush-259:022:00:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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