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2026-07-03 - 07:15

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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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 10 highest latencies:
System rack5slot4s.osadl.org (updated Fri Jul 03, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27222332610,5sleep30-21swapper/323:45:213
2443007996054,4cyclictest2538738-21kworker/u8:3+events_unbound20:45:270
2443007995853,4cyclictest2538738-21kworker/u8:3+flush-8:021:05:290
2443007995851,6cyclictest2442878-21kworker/u8:2+flush-8:019:40:260
26103122560,4chrt0-21swapper/021:55:170
2443007995446,5cyclictest2708255-21kworker/u8:0+flush-8:000:30:150
2443007995443,9cyclictest2732247-21ntpq23:55:220
2443011995347,5cyclictest2708255-21kworker/u8:0+flush-8:023:50:321
2443011995338,10cyclictest1704890-21systemd-journal23:30:471
2443007995245,5cyclictest2688716-21kworker/u8:3+flush-8:023:30:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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