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2026-07-10 - 07:51

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 Fri Jul 10, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2199917994742,4cyclictest2157043-21kworker/u8:1+flush-259:019:35:002
2199911994644,1cyclictest2337750-21fwupd21:20:201
2199921994238,3cyclictest2329370-21kworker/u8:0+events_unbound21:20:233
2199917994034,4cyclictest2344588-21latency_hist21:30:012
2199921993734,2cyclictest2225599-21kworker/u8:3+flush-259:019:54:593
2199917993529,4cyclictest2422378-21latency_hist22:45:012
2199911993530,3cyclictest2240997-21latency_hist19:50:001
2199908993529,4cyclictest2463684-21latency_hist23:25:010
2199921993328,4cyclictest2215296-21latency_hist19:25:013
2199921993228,3cyclictest2407161-21/usr/sbin/munin22:30:253
2199911993228,3cyclictest335557-21systemd-journal21:01:291
2199917993124,4cyclictest2329140-21latency_hist21:15:002
2199911993125,4cyclictest2360331-21apt-get21:45:111
2199908993125,4cyclictest2494797-21cat23:55:010
2199921992925,3cyclictest2246381-21kworker/u8:1+flush-259:020:25:243
2199917992824,3cyclictest2338558-21kworker/u8:3+flush-259:021:45:022
2199917992823,3cyclictest2443079-21kworker/u8:3+flush-259:023:35:012
2199911992823,4cyclictest2250458-21ntpq19:55:191
2199911992621,3cyclictest2453632-21/usr/sbin/munin23:15:231
2199908992622,3cyclictest2157043-21kworker/u8:1+flush-259:019:26:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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