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2026-09-10 - 02:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Thu Sep 10, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
162853021940,6sleep30-21swapper/322:49:153
151460921780,3sleep375-21kworker/3:1-events20:54:133
16606852870,2chrt75-21kworker/3:1-events23:20:013
15549172760,1sleep11554923-21tr21:34:151
14883992610,2sleep375-21kworker/3:1-events20:29:133
16425192600,3sleep375-21kworker/3:1-events23:04:123
1409754995634,18cyclictest278-21systemd-journal23:29:091
1409749995247,4cyclictest1585599-21kworker/u8:1+events_unbound22:24:190
1409749995145,4cyclictest1436729-21kworker/u8:2+events_unbound21:29:240
1409749995145,4cyclictest1385468-21kworker/u8:2+flush-8:019:15:050
1409749995043,4cyclictest1436729-21kworker/u8:2+events_unbound21:24:250
1409749995041,7cyclictest1571262-21/usr/sbin/munin21:54:220
1409749995041,7cyclictest1441656-21latency_hist19:40:010
16642752490,3chrt481ktimers/323:24:143
1409749994945,3cyclictest1436729-21kworker/u8:2+flush-8:019:44:210
1409749994944,3cyclictest1575926-21kworker/u8:2+events_unbound22:40:000
1409749994738,7cyclictest1600386-21latency_hist22:20:010
1409749994738,4cyclictest1466864-21kworker/u8:4+flush-8:020:24:230
1409749994541,3cyclictest1491768-21kworker/u8:0+events_unbound21:14:230
17223372440,1sleep11722340-21kthreadcore00:24:101
1409754994436,6cyclictest1720651-21latency_hist00:20:011
1409749994440,3cyclictest1521314-21kworker/u8:3+flush-8:021:34:220
1409754994336,5cyclictest1431357-21kworker/u8:3+flush-8:019:49:201
1409749994338,4cyclictest1610463-21kworker/u8:3+events_unbound00:10:010
1409749994337,4cyclictest283439-21kworker/u8:1+events_unbound19:24:130
1409749994337,4cyclictest283439-21kworker/u8:1+events_unbound19:24:130
1409749994337,4cyclictest1585599-21kworker/u8:1+events_unbound22:59:260
1409754994230,8cyclictest278-21systemd-journal22:29:101
1409754994222,17cyclictest1690130-21ntpq23:49:191
1409749994237,3cyclictest1665394-21kworker/u8:1+flush-8:023:39:110
1409754994122,17cyclictest1422394-21apt-get19:24:061
1409754994122,17cyclictest1422394-21apt-get19:24:061
1409749994136,4cyclictest1521314-21kworker/u8:3+events_unbound21:59:110
1409749994136,3cyclictest1610463-21kworker/u8:3+events_unbound23:59:200
1409754994029,7cyclictest278-21systemd-journal19:33:101
1409749994036,3cyclictest1575926-21kworker/u8:2+flush-8:023:24:220
1409749994035,4cyclictest1565814-21kworker/u8:0+flush-8:022:04:200
1409749994035,3cyclictest1466864-21kworker/u8:4+events_unbound20:14:120
1409754993927,10cyclictest1575663-21latency_hist21:55:011
1409749993935,3cyclictest1436729-21kworker/u8:2+events_unbound19:54:120
1409749993934,3cyclictest1521314-21kworker/u8:3+flush-8:021:44:170
1409749993933,4cyclictest1610463-21kworker/u8:3+events_unbound22:54:200
1409749993933,4cyclictest1575926-21kworker/u8:2+flush-8:023:19:190
1409749993929,7cyclictest1511151-21latency_hist20:50:010
1409749993929,4cyclictest1385468-21kworker/u8:2+events_unbound19:14:210
1409754993830,6cyclictest1576198-21/usr/sbin/munin21:59:181
1409754993830,6cyclictest1481479-21latency_hist20:20:011
1409754993828,8cyclictest1665394-21kworker/u8:1+flush-8:023:44:151
1409754993828,8cyclictest1665394-21kworker/u8:1+flush-8:023:44:151
1409754993823,13cyclictest1665342-21unixbench_singl23:24:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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