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2026-09-24 - 07:38

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 Thu Sep 24, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1421757996559,4cyclictest1551227-21latency_hist21:15:002
1421762994741,4cyclictest1551865-21cp21:15:013
1421750994641,4cyclictest1515064-21kworker/u8:3+flush-259:021:40:240
1421752994438,4cyclictest1702866-21latency_hist23:40:011
1421762994134,5cyclictest1457181-21ntpq19:40:233
1421750994135,4cyclictest1453142-21kworker/u8:2+flush-259:019:50:220
1421752993834,3cyclictest1515064-21kworker/u8:3+flush-259:022:10:271
1421750993832,4cyclictest1630605-21/usr/sbin/munin22:30:150
1421752993732,3cyclictest1515303-21apt-get20:40:111
1421750993632,3cyclictest1515064-21kworker/u8:3+events_unbound21:45:240
1421762993531,3cyclictest1677220-21kworker/u8:3+flush-259:023:30:223
1421750993527,6cyclictest1514147-21ntpq20:35:180
1421762993431,2cyclictest1515064-21kworker/u8:3+events_unbound21:20:273
1421762993428,4cyclictest1572765-21latency_hist21:35:013
1421750993427,5cyclictest1614025-21ntpq22:10:270
1421762993327,4cyclictest1447731-21latency_hist19:35:013
1421762993226,4cyclictest335557-21systemd-journal21:50:013
1421752993228,2cyclictest1630595-21kworker/u8:2+flush-259:000:25:171
1421750993228,3cyclictest1493978-21kworker/u8:0+flush-259:020:25:200
1421750993124,5cyclictest1696871-21ntpq23:30:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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