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2026-04-06 - 00:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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 rackeslot6s.osadl.org (updated Sun Apr 05, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1867433998679,4cyclictest131ktimers/010:30:010
186743599793,31cyclictest1903640-21/usr/sbin/munin10:40:191
186743599605,2cyclictest0-21swapper/108:00:011
1867435995821,29cyclictest0-21swapper/110:20:271
1867433995811,13cyclictest15-21rcuc/008:00:010
1867435995730,20cyclictest0-21swapper/108:40:281
1867435995730,20cyclictest0-21swapper/108:40:281
1867435995722,29cyclictest0-21swapper/109:55:171
186743599572,14cyclictest1921555-21apt-get12:25:171
186743399571,53cyclictest0-21swapper/007:20:120
1867435995515,30cyclictest0-21swapper/110:45:281
1867435995512,35cyclictest0-21swapper/110:50:201
1867435995511,35cyclictest0-21swapper/107:15:291
186743599551,11cyclictest1906369-21/usr/sbin/munin10:55:221
186743399552,48cyclictest1912459-21kernelversion11:30:220
186743399552,48cyclictest1912459-21kernelversion11:30:220
1867437995415,10cyclictest1898269-21apt-get10:10:022
1867437995415,10cyclictest1898269-21apt-get10:10:012
186743599542,8cyclictest1886773-21cut09:00:191
1867435995426,19cyclictest0-21swapper/109:30:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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