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2026-05-22 - 19:02

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 Fri May 22, 2026 00:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1025868996628,3cyclictest1070010-21apt-get23:25:120
102586899642,37cyclictest0-21swapper/021:05:000
1025868996413,9cyclictest1047442-21grep21:10:280
102586899631,42cyclictest0-21swapper/023:50:020
1025868996311,10cyclictest1082474-21grep00:35:300
1025868996222,37cyclictest1053001-21/usr/sbin/munin21:45:210
1025868995612,37cyclictest1045056-21ls21:00:000
1025868995514,31cyclictest1039920-21/usr/sbin/munin20:30:100
1025868995514,31cyclictest1039920-21/usr/sbin/munin20:30:100
1025868995418,9cyclictest1061485-21fschecks_time22:35:220
102586899541,49cyclictest1063684-21/usr/sbin/munin22:45:280
102586899541,49cyclictest1063684-21/usr/sbin/munin22:45:280
102586899541,44cyclictest0-21swapper/019:15:000
1025872995337,12cyclictest311ktimers/221:40:112
1025868995335,14cyclictest0-21swapper/022:45:000
1025871995213,21cyclictest1070007-21/usr/sbin/munin23:25:191
1025868995241,7cyclictest0-21swapper/023:05:290
1025868995232,11cyclictest0-21swapper/020:20:170
1025868995223,4cyclictest1059668-21/usr/sbin/munin22:25:160
1025872995143,4cyclictest1069718-21munin-plugin-st23:25:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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