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2025-12-19 - 14:34

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 Dec 19, 2025 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1858851993933,4cyclictest252-21systemd-journal19:50:010
1858864993327,4cyclictest2025272-21latency_hist21:50:013
1858852993327,4cyclictest1978377-21latency_hist21:05:011
185885199330,31cyclictest1-21systemd00:15:000
1858851993227,3cyclictest2092886-21apt-get22:55:140
1858851993127,3cyclictest1864037-21kworker/u8:2+events_unbound19:40:150
1858852993025,4cyclictest1915699-21kworker/u8:2+flush-259:020:10:001
1858852993024,4cyclictest252-21systemd-journal23:20:001
1858851993026,3cyclictest1973412-21kworker/u8:0+flush-259:021:08:090
1858852992924,4cyclictest1915699-21kworker/u8:2+flush-259:020:10:181
1858852992921,5cyclictest252-21systemd-journal23:05:001
1858851992925,3cyclictest2087498-21kworker/u8:2+flush-259:023:00:170
1858864992717,9cyclictest1951950-21idleruntime-cro20:40:003
1858852992721,4cyclictest2019627-21apt-get21:45:001
1858851992723,2cyclictest2009324-21kworker/u8:2+events_unbound22:05:180
1858864992616,8cyclictest509-21rs:main3
1858859992623,2cyclictest1884706-21kworker/u8:0+flush-259:019:55:012
1858852992621,3cyclictest1957608-21kworker/u8:5+flush-259:021:30:171
1858852992620,4cyclictest252-21systemd-journal22:55:001
1858851992622,3cyclictest1900205-21kworker/u8:4+flush-259:020:20:270
1858851992621,4cyclictest1904500-21ntpq19:50:240
1858864992522,2cyclictest2051213-21kworker/u8:1+flush-259:022:15:163
1858864992520,3cyclictest2140644-21apt-get23:40:133
1858852992518,5cyclictest2160124-21ntpq23:55:221
185886499245,10cyclictest1929744-21cut20:15:203
1858859992421,2cyclictest2051213-21kworker/u8:1+events_unbound22:30:182
1858859992421,2cyclictest1957608-21kworker/u8:5+events_unbound20:50:252
1858859992421,2cyclictest1957608-21kworker/u8:5+events_unbound20:50:252
1858859992418,5cyclictest252-21systemd-journal21:35:002
1858852992418,4cyclictest1926031-21kworker/u8:3+flush-259:020:15:181
1858852992416,5cyclictest2196225-21ntpq00:30:231
1858851992419,3cyclictest1874330-21latency_hist19:25:010
1858851992415,6cyclictest252-21systemd-journal21:15:000
1858864992315,7cyclictest2155829-21munin-run23:55:003
185886499230,13cyclictest2081657-21sed22:40:253
185886499230,13cyclictest1919702-21grep20:05:193
185886499230,11cyclictest2091702-21ntpq22:50:223
1858859992320,2cyclictest2051213-21kworker/u8:1+flush-259:022:15:182
1858859992320,2cyclictest2009324-21kworker/u8:2+flush-259:021:35:262
1858859992319,3cyclictest2102993-21kworker/u8:1+flush-259:023:10:152
1858859992319,3cyclictest2030657-21kworker/u8:1+events_unbound21:55:162
1858859992319,3cyclictest1957607-21kworker/u8:4+events_unbound20:55:252
1858859992319,3cyclictest1957607-21kworker/u8:4+events_unbound20:55:252
1858859992319,3cyclictest1926031-21kworker/u8:3+events_unbound20:45:182
1858859992318,3cyclictest2129424-21/usr/sbin/munin23:30:142
1858859992317,5cyclictest2040703-21latency_hist22:05:012
1858851992320,2cyclictest509-21rs:main0
1858851992319,3cyclictest2019258-21kworker/u8:3+flush-259:021:50:180
1858851992317,4cyclictest1961922-21ntpq20:45:210
1858859992219,2cyclictest2166190-21turbostat.cron00:05:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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