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2026-05-06 - 18:21

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Wed May 06, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3325255994336,4cyclictest3620807-21latency_hist11:55:003
3325246994240,1cyclictest3439118-21kworker/0:1+pm09:11:210
3325250993531,3cyclictest3438980-21gpgv09:00:001
3325250993431,2cyclictest3610670-21kworker/u8:3+flush-259:011:50:001
3325250993329,3cyclictest3428795-21kworker/u8:1+flush-259:010:05:011
3325255993224,6cyclictest3365432-21ntpq07:45:213
3325253993228,3cyclictest3542493-21kworker/u8:4+flush-259:011:30:152
3325253993226,5cyclictest3325177-21latency_hist07:10:012
3325250993227,4cyclictest3325465-21apt-get07:10:121
3325253993125,4cyclictest252-21systemd-journal09:06:452
3325246992823,4cyclictest3330606-21apt-get07:15:140
3325253992720,6cyclictest3443530-21ntpq09:00:202
3325246992721,4cyclictest3532137-21latency_hist10:30:010
3325246992721,4cyclictest252-21systemd-journal08:00:450
3325250992619,5cyclictest3645732-21ntpq12:15:221
3325250992522,2cyclictest3553051-21kworker/u8:2+flush-259:011:20:001
3325255992420,3cyclictest3584484-40mandb11:17:213
3325253992419,3cyclictest252-21systemd-journal07:10:452
3325250992419,4cyclictest3600427-21apt-get11:35:131
3325246992417,5cyclictest252-21systemd-journal12:10:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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