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2026-07-13 - 06:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Mon Jul 13, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
5683352670,2sleep2371rcuc/221:30:122
5043152470,2chrt371rcuc/220:25:242
423235994642,3cyclictest629228-21kworker/u8:0+events_unbound22:50:201
423235994642,3cyclictest408657-21kworker/u8:2+events_unbound19:40:211
423235994642,3cyclictest408657-21kworker/u8:2+events_unbound00:00:231
423235994635,4cyclictest583524-21ntpq21:45:161
423231994641,3cyclictest408657-21kworker/u8:2+flush-8:019:15:050
423235994440,3cyclictest71236-21kworker/u8:1+events_unbound20:45:061
423235994440,3cyclictest629228-21kworker/u8:0+events_unbound23:30:201
423235994440,3cyclictest408657-21kworker/u8:2+events_unbound22:30:181
423235994440,3cyclictest408657-21kworker/u8:2+events_unbound21:55:191
423235994438,4cyclictest614161-21apt-get22:20:021
423235994432,5cyclictest682835-21ntpq23:25:151
423240994334,7cyclictest1704890-21systemd-journal23:40:002
423235994339,3cyclictest408657-21kworker/u8:2+events_unbound23:10:081
423235994339,3cyclictest408657-21kworker/u8:2+events_unbound21:30:051
423235994239,2cyclictest629228-21kworker/u8:0+events_unbound22:35:221
423235994238,3cyclictest408657-21kworker/u8:2+events_unbound23:15:231
423235994238,3cyclictest369911-21kworker/u8:0+events_unbound21:25:031
423235994233,5cyclictest0-21swapper/121:05:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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