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2026-08-18 - 14:09

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 Aug 18, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
613101994842,4cyclictest335557-21systemd-journal00:20:003
613101994640,4cyclictest878336-21kworker/u8:3+events_unbound00:30:223
613096994138,2cyclictest608145-21kworker/u8:3+flush-259:019:45:232
613093994035,3cyclictest608145-21kworker/u8:3+flush-259:019:55:011
613090994033,4cyclictest863225-21diskstats23:10:150
613101993833,3cyclictest878336-21kworker/u8:3+events_unbound23:50:193
613093993832,4cyclictest712534-21/usr/sbin/munin20:45:151
613096993733,3cyclictest800458-21kworker/u8:3+flush-259:022:40:252
613096993733,3cyclictest800458-21kworker/u8:3+events_unbound23:00:252
613090993631,3cyclictest697026-21apt-get20:30:130
613090993631,3cyclictest1-21systemd19:45:000
613093993530,3cyclictest335557-21systemd-journal20:01:361
613090993531,3cyclictest648899-21kworker/u8:1+flush-259:019:55:240
613101993431,2cyclictest700894-21kworker/u8:2+events_unbound21:00:203
613101993431,2cyclictest700894-21kworker/u8:2+events_unbound21:00:193
613096993431,2cyclictest920193-21kworker/u8:4+flush-259:000:05:192
613093993429,4cyclictest826635-21kworker/u8:0+flush-259:022:45:001
613101993327,4cyclictest758906-21apt-get21:30:003
613096993329,3cyclictest759555-21kworker/u8:2+flush-259:023:25:172
613096993329,3cyclictest759555-21kworker/u8:2+flush-259:022:25:172
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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