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2026-06-12 - 20:08

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 Fri Jun 12, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
87811623900,2sleep3481ktimers/312:00:003
69876421750,1sleep375-21kworker/3:1-events08:55:493
60275821710,6sleep30-21swapper/307:20:383
588531997568,5cyclictest758968-21kworker/u8:3+flush-8:010:05:461
588525996959,7cyclictest918181-21latency_hist12:40:000
588535996049,8cyclictest913403-21cat12:35:012
588531996051,7cyclictest1704890-21systemd-journal10:53:091
588531995947,9cyclictest723225-21ntpq09:20:421
588531995853,3cyclictest620373-21kworker/u8:2+flush-8:007:55:311
588531995853,3cyclictest620373-21kworker/u8:2+flush-8:007:55:301
588531995651,4cyclictest723261-21kworker/u8:2+events_unbound10:15:411
588531995649,5cyclictest567992-21kworker/u8:3+flush-8:008:20:421
588531995447,5cyclictest669507-21kworker/u8:0+flush-8:009:10:301
588531995447,4cyclictest758968-21kworker/u8:3+events_unbound11:50:291
588531995443,8cyclictest892007-21ntpq12:10:401
588525995444,7cyclictest592575-21ntpq07:10:430
588531995044,4cyclictest567992-21kworker/u8:3+flush-8:008:35:421
588531994942,5cyclictest614902-21kworker/u8:1+flush-8:008:15:341
588531994938,9cyclictest629177-21ntpq07:45:441
588535994837,8cyclictest679467-21cat08:40:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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