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2026-07-04 - 07:00

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 Sat Jul 04, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4034402997571,3cyclictest4049844-21kworker/u8:3+events_unbound20:30:010
4034412995551,3cyclictest4049844-21kworker/u8:3+flush-259:019:55:012
4034407994845,2cyclictest75-21kswapd023:43:241
4034412994441,2cyclictest75-21kswapd023:43:232
4034412994441,2cyclictest4127676-21kworker/u8:2+events_unbound20:50:222
4034402994336,2cyclictest4049844-21kworker/u8:3+events_unbound19:35:130
4034402994239,2cyclictest4044411-21kworker/u8:0+flush-259:020:10:230
4034402994238,3cyclictest335557-21systemd-journal21:00:210
4034402994238,3cyclictest32052-21kworker/u8:2+flush-259:022:20:220
4034402994138,2cyclictest4168610-21kworker/u8:1+events_unbound21:35:150
4034402994138,2cyclictest4044411-21kworker/u8:0+flush-259:020:25:210
4034402994138,2cyclictest4044411-21kworker/u8:0+flush-259:020:15:220
4034407994036,3cyclictest4044411-21kworker/u8:0+flush-259:020:30:151
4034402994036,3cyclictest75-21kswapd023:43:230
4034402993936,2cyclictest4143116-21kworker/u8:1+flush-259:021:05:160
4034402993936,2cyclictest4127676-21kworker/u8:2+flush-259:021:15:200
4034402993935,3cyclictest6357-21kworker/u8:2+events_unbound21:50:200
4034402993935,3cyclictest156365-21kworker/u8:1+flush-259:000:15:220
4034416993833,3cyclictest335557-21systemd-journal21:30:223
4034412993835,2cyclictest42380-21kworker/u8:3+events_unbound22:50:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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