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2026-05-25 - 20:00

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 Mon May 25, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1399949994744,2cyclictest1550821-21kworker/u8:2+events_unbound09:40:140
1399949994643,2cyclictest1608327-21kworker/u8:1+flush-259:010:35:240
1399949994642,3cyclictest1676698-21kworker/u8:3+events_unbound11:35:230
1399949994638,2cyclictest1676698-21kworker/u8:3+events_unbound11:50:200
1399951994439,4cyclictest1659644-21ntpq11:15:201
1399949994341,2cyclictest1514713-21kworker/u8:1+flush-259:009:25:240
1399949994340,2cyclictest1535344-21kworker/u8:0+events_unbound11:20:240
1399949994239,2cyclictest1379374-21kworker/u8:3+events_unbound07:20:160
1399949994138,2cyclictest1707526-21kworker/u8:2+events_unbound12:35:230
1399949994138,2cyclictest1639519-21kworker/u8:2+flush-259:011:30:220
1399949994138,2cyclictest1582033-21kworker/u8:3+events_unbound10:40:230
1399949994138,2cyclictest1582033-21kworker/u8:3+events_unbound10:10:200
1399949994138,2cyclictest1379374-21kworker/u8:3+events_unbound07:30:220
1399949994037,2cyclictest1550821-21kworker/u8:2+flush-259:009:55:230
1399949994037,2cyclictest1514740-21kworker/u8:4+flush-259:009:05:240
1399959993935,3cyclictest1582033-21kworker/u8:3+flush-259:010:10:213
1399959993934,3cyclictest1592438-21apt-get10:15:103
1399949993936,2cyclictest1728138-21kworker/u8:3+events_unbound12:30:230
1399949993935,3cyclictest1676698-21kworker/u8:3+events_unbound12:00:230
1399949993935,3cyclictest1495310-21kworker/u8:3+events_unbound08:50:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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