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2026-06-12 - 04:09

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 Fri Jun 12, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
764432994943,4cyclictest816037-21apt-get19:56:200
764441994236,4cyclictest335557-21systemd-journal20:20:012
764445994135,4cyclictest846944-21ntpq20:25:193
764432994135,4cyclictest1076097-21ntpq00:05:220
764437994033,5cyclictest977804-21ntpq22:30:221
764445993933,4cyclictest1097585-21latency_hist00:30:013
764437993932,5cyclictest1054959-21ntpq23:45:211
764441993833,4cyclictest335557-21systemd-journal23:52:252
764437993832,4cyclictest853234-21/usr/sbin/munin20:35:141
764432993832,4cyclictest962790-21latency_hist22:20:010
764432993832,4cyclictest962790-21latency_hist22:20:010
764445993731,4cyclictest335557-21systemd-journal23:57:473
764441993731,4cyclictest1029275-21ntpq23:20:222
764441993730,5cyclictest936549-21latency_hist21:55:012
764432993734,2cyclictest879320-21kworker/u8:0+flush-259:021:00:160
764432993633,2cyclictest931631-21apt-get21:50:110
764437993431,2cyclictest759444-21kworker/u8:1+flush-259:019:55:161
764437993327,4cyclictest890289-21apt-get21:10:111
764441993227,3cyclictest842342-21gpgv20:25:002
764437993228,3cyclictest1024736-21kworker/u8:1+flush-259:023:40:011
764432993229,2cyclictest968553-21kworker/u8:3+flush-259:022:35:250
764432993228,3cyclictest1092654-21apt-get00:25:100
764432993228,3cyclictest1050596-21kworker/u8:2+flush-259:000:00:250
764445993126,3cyclictest509-21rs:main3
764441993126,4cyclictest335557-21systemd-journal00:03:252
764441993125,4cyclictest973508-21latency_hist22:30:002
764437993025,4cyclictest968462-21gpgv22:25:011
764437993024,5cyclictest831031-21ntpq20:10:211
764432993024,4cyclictest968507-21cat22:25:010
764445992925,3cyclictest837277-21/usr/sbin/munin20:20:183
764445992925,3cyclictest821578-21kworker/u8:2+flush-259:020:05:203
764445992922,5cyclictest335557-21systemd-journal22:50:003
764441992924,3cyclictest759444-21kworker/u8:1+flush-259:019:55:002
764437992925,3cyclictest931390-21kworker/u8:1+flush-259:021:55:211
764437992925,3cyclictest821578-21kworker/u8:2+flush-259:020:55:151
764432992925,3cyclictest873806-21gpgv20:55:010
764445992825,2cyclictest826973-21kworker/u8:3+flush-259:020:40:003
764445992824,3cyclictest774665-21kworker/u8:0+flush-259:019:50:203
764445992823,4cyclictest1077201-21apt-get00:10:113
764441992823,4cyclictest1035530-21/usr/sbin/munin23:30:182
764437992824,3cyclictest759444-21kworker/u8:1+flush-259:019:10:231
764432992823,4cyclictest737550-21kworker/u8:2+events_unbound19:25:200
764432992823,3cyclictest963021-21/usr/sbin/munin22:20:130
764432992724,2cyclictest759444-21kworker/u8:1+events_unbound19:30:200
764432992721,5cyclictest768608-21ntpq19:10:190
764445992622,3cyclictest842260-21kworker/u8:4+flush-259:021:05:003
764445992622,3cyclictest826973-21kworker/u8:3+flush-259:020:10:253
764441992622,3cyclictest335557-21systemd-journal23:41:262
764441992622,3cyclictest1040467-21kworker/u8:3+flush-259:023:45:242
764441992621,4cyclictest1107914-21latency_hist00:40:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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