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2026-03-15 - 13:35

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 50 highest latencies:
System rackeslot4s.osadl.org (updated Sun Mar 15, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1022833994437,5cyclictest1153055-21latency_hist21:15:000
1022833994336,4cyclictest1178942-21cp21:40:010
1022846994037,2cyclictest1053727-21kworker/u8:0+flush-259:020:45:192
1022846993633,2cyclictest1256927-21kworker/u8:2+events_unbound23:05:182
1022833993530,3cyclictest1220753-21apt-get22:20:090
1022846993430,3cyclictest1137373-21kworker/u8:1+events_unbound21:20:192
1022848993327,4cyclictest1080045-21latency_hist20:04:593
1022841993328,3cyclictest1110956-21latency_hist20:35:011
1022846993226,5cyclictest1345577-21latency_hist00:20:022
1022833993128,2cyclictest1330065-21kworker/u8:0+flush-259:000:30:230
1022833993125,4cyclictest1189780-21/usr/sbin/munin21:50:140
1022833993125,4cyclictest1085168-21latency_hist20:10:010
1022841993026,3cyclictest1340656-21apt-get00:15:121
1022841993023,5cyclictest1099817-21ntpq20:20:201
1022846992925,3cyclictest1127066-21kworker/u8:4+flush-259:020:50:192
1022833992925,3cyclictest990599-21kworker/u8:2+flush-259:019:20:000
1022833992924,3cyclictest1168606-21kworker/u8:0+events_unbound21:40:120
1022848992721,4cyclictest1366238-21latency_hist00:40:003
1022846992724,2cyclictest1105829-21kworker/u8:2+flush-259:021:55:212
1022846992724,2cyclictest1043381-21kworker/u8:1+events_unbound20:20:122
1022848992623,2cyclictest1230733-21kworker/u8:0+flush-259:022:45:003
1022848992622,3cyclictest1064115-21apt-get19:50:033
1022846992622,3cyclictest1351001-21apt-get00:25:122
1022846992622,3cyclictest1189558-21kworker/u8:1+events_unbound21:50:012
1022846992620,2cyclictest1027989-21kworker/u8:0+flush-259:019:25:012
1022833992622,3cyclictest1230733-21kworker/u8:0+events_unbound22:40:190
1022833992620,4cyclictest990599-21kworker/u8:2+events_unbound19:25:170
1022846992522,2cyclictest1325163-21kworker/u8:6+events_unbound00:00:142
1022846992522,2cyclictest1314763-21kworker/u8:4+events_unbound00:10:172
1022846992522,2cyclictest1205020-21kworker/u8:3+flush-259:022:55:152
1022846992521,3cyclictest1105829-21kworker/u8:2+flush-259:021:35:212
1022833992522,2cyclictest1298624-21kworker/u8:1+flush-259:000:15:230
1022833992522,2cyclictest1105829-21kworker/u8:2+flush-259:021:30:190
1022833992521,3cyclictest1012210-21kworker/u8:3+events_unbound19:20:180
1022848992420,3cyclictest1111181-21kworker/u8:3+flush-259:020:47:263
1022848992419,4cyclictest1266361-21ntpq23:00:213
1022848992416,7cyclictest0-21swapper/319:50:003
1022846992421,2cyclictest1230733-21kworker/u8:0+events_unbound23:35:262
1022846992421,2cyclictest1012210-21kworker/u8:3+events_unbound19:55:262
1022846992420,3cyclictest1210396-21kworker/u8:4+events_unbound22:20:112
1022846992420,3cyclictest1137373-21kworker/u8:1+events_unbound21:10:182
1022833992421,2cyclictest1205020-21kworker/u8:3+flush-259:022:25:250
1022833992418,4cyclictest1106054-21apt-get20:30:120
1022848992317,4cyclictest252-21systemd-journal21:00:003
1022848992317,4cyclictest1325163-21kworker/u8:6+flush-259:000:05:173
1022848992317,4cyclictest1179687-21diskstats21:40:133
1022846992320,2cyclictest1205020-21kworker/u8:3+flush-259:022:25:152
1022846992320,2cyclictest1194934-21kworker/u8:0+flush-259:022:00:232
1022846992319,3cyclictest1325163-21kworker/u8:6+events_unbound00:20:122
1022841992319,3cyclictest252-21systemd-journal23:47:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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